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Roring, Irawati RJC, Fransine B. Manginsela und Boyke H. Toloh. „The Existence of Intertidal Gastropods in Malalayang Beach, North Sulawesi“. JURNAL ILMIAH PLATAX 1, Nr. 3 (27.08.2013): 132. http://dx.doi.org/10.35800/jip.1.3.2013.2571.
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ABSTRACT This study aims to determine the density, relative density and patterns of distribution of gastropods and diversity index gastropod community in the intertidal Malalayang Beach (behind Minanga Hotel), North Sulawesi. Gastropods sampling using quadratic size 0.5x0.5 m2 placed systematically and proportionally on dead coral sandy substrate mix mud, rocks slightly sandy substrate and substrate-sized stones. The results found have been changes in the number of species of the 30 species of gastropods (Manginsela, 1998) now to only 15 species. While the density of intertidal Malalayang gastropods contained 0,13 and the current range of 0.06 - 0.13 individu/m2 and relative density ranged from 2%-38.5%. Diversity index contained in the intertidal gastropod dead coral layered thin smear highest H' = 2.412 following the rocky region is H' = 2.232, and the lowest in the region b is H' = 2.059. Dispersal patterns in the intertidal gastropod are all randomized except Cypraea felina the distribution pattern of the group. Keywords : gastropod, distribution ABSTRAK Penelitian ini bertujuan mengetahui kepadatan, kepadatan relatif dan pola penyebaran dari masing-masing jenis gastropoda serta indeks keanekaragam komunitas gastropoda di intertidal Pantai Malalayang (di belakang Minanga Hotel), Propinsi Sulawesi Utara. Pengambilan contoh gastropoda menggunakan kuadrat ukuran 0.5x0.5 m2 yang ditempatkan secara sistimatis dan proporsional pada substrat karang mati berpasir campur lumpur, substrat bebatuan sedikit berpasir substrat batu-berukuran. Hasil penelitian menemukan telah terjadi perubahan jumlah spesies gastropoda dari 30 spesies (Manginsela, 1998) menjadi hanya 15 spesies. Sedangkan kepadatan gastropoda yang terdapat di intertidal pantai Malalayang dari berkisar 0,13 individu/m2 saat ini 0,06-0,13 individu/m2 dan kepadatan relatif berkisar 2% - 38,5%. Indeks keanekaragaman gastropoda yang terdapat di intertidal karang mati berlapis lumpur tipis tertinggi adalah H’ = 2,412 menyusul kawasan berbatu adalah H’ = 2,232 serta terendah kawasan pada kawasan b adalah H’ = 2,059. Pola penyebaran gastropoda di intertidal ini semuanya acak kecuali Cypraea felina yang pola penyebarannya kelompok. Kata kunci : gastropoda, distribusi1 Bagian dari skripsi2 Mahasiswa Program Studi Manajemen Sumberdaya Perairan FPIK-UNSRAT 3 Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi
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Bugaleng, Cornelis Dimas, Fransine B. Manginsela und Alex D. Kambey. „In Intertidal Gastropod community Malalayang Beach Manado North Sulawesi“. JURNAL ILMIAH PLATAX 3, Nr. 1 (12.04.2015): 36. http://dx.doi.org/10.35800/jip.3.1.2015.13217.
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This study aims to determine the density and relative density of gastropods and diversity index of the community as well as evenness and dominance index in the intertidal beach Malalayang), Manado in North Sulawesi. Gastropods were sampled using quadrate with size 1x1m2 placed systematically and disproportionately on dead coral sandy substrate, mix mud, rocks slightly sandy substrate, and substrate-sized stones. The study found that there has been a change in the amount of 30 species of gastropod species (Manginsela, 1998) increased to 69 species. While the density of gastropods contained in the intertidal beach of Malalayangis ranging from 13,63individu / m2to currently 2,73-13,63individu / m2 and relative density ranging from 11.22% - 42.78%. Diversity index of organism is high with a value of H '= 2.81497. Evenness index of gastropods in Malalayang Beach intertidalcould be categorized fairly even and almost evenly. Meanwhile, the low dominance values C = 0.2132, indicating that the area has good conditions as a place to live, and yet there is competition, which means, food or a place is suitable for gastropods to live. The intertidal area of Malalayang Beach Manado North Sulawesi substrate are mainly in the form of sandy coral, slightly muddy and rocky. Keywords: gastropod, distribution A B S T R A K Penelitian ini bertujuan mengetahui kepadatan, kepadatan relative dari masing-masing jenis gastropoda serta indeks keanekaragam komunitas gastropoda, kemerataan dan indeks dominansi di intertidal Pantai Malalayang (di belakang Minanga Hotel), Manado Sulawesi Utara. Pengambilan contoh gastropoda menggunakan kuadrat ukuran 1x1m2 yang ditempatkan secara sistimatis dan proporsional pada substrat karang mati berpasir campur lumpur, substrat bebatuan sedikit berpasir substrat batu-berukuran. Hasil penelitian menemukan telah terjadi perubahan jumlah spesies gastropoda dari 30 spesies (Manginsela, 1998) meningkat menjadi hanya 69 spesies. Sedangkan kepadatan gastropoda yang terdapat di intertidal pantai Malalayang dari berkisar 13,63individu/m2 saat ini 2,73-13,63individu/m2 dan kepadatan relatif berkisar 11,22% - 42,78%. Keanekaragaman jenis organisme tergolong tinggi dengan nilai H’ = 2,81497. Kemerataan jenis gastropoda pada intertidan Pantai Malalayang Manado Sulawesi Utara termasuk kategori cukup merata dan hampir merata. Sedangkan, Dominasi rendah yakni nilai C = 0.2132, menunjukkan bahwa daerah tersebut memiliki kondisi yang baik sebagai tempat hidup dan belum terjadi persaingan yang berarti terhadap ruangg, makanan atau tempat hidup bagi gastropoda. Di daerah intertidal Pantai Malalayang Manado Sulawesi Utara Substrat berupa karang mati berpasir, berlumpur tipis dan berbatuan. Kata Kunci : Gastropoda, Distribusi 1Mahasiswa Program Studi MSP FPIK-UNSRAT 2Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi
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Supratman, Okto, Arthur Muhammad Farhaby und Jemi Ferizal. „KELIMPAHAN DAN KEANEKARAGAMAN GASTROPODA PADA ZONA INTERTIDAL DI PULAU BANGKA BAGIAN TIMUR“. JURNAL ENGGANO 3, Nr. 1 (29.04.2018): 10–21. http://dx.doi.org/10.31186/jenggano.3.1.10-21.
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AbstractEnvironmental damage from anthropogenic activity will lead to a decrease in water quality, which then affects aquatic organisms including Gastropoda. So it is necessary to do a study of diversity and abundance of gastropods in East Bangka Island.The study was conducted from June to December 2017. The research locations were divided into 6 stations. Data collection of gastropods using squares of size 50 cm x 50 cm, performed by direct gastropod removal by hand, then identified in Water Resource Management Laboratory. The results of this study found 12 species of gastropods from 8 families. The families found are Cerithideidae (2 species), Cerithiidae (1 species), Cirridae (1 species), Nassariidae (2 species), Neritidae (2 species), Planaxidae (1 species), Muricidae (1 Species) and Costellariidae (2 Species ). The highest abundance of gastropods is Certhidea cingulata species with an average abundance of 124.54 ind / m2. The value of diversity index of gastropod in the eastern part of the island of Bangka categorized small, it is thought to be caused by loss of habitat as a result of mining activities at sea. Keywords: Gastropods, Diversity, Abundance, Intertidal Zone
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Salmanu, Sriyanti. „KEANEKARAGAMAN GASTROPODA PADA ZONA INTERTIDAL TENGAH (MIDLE INTERTIDAL ZONE) DAN ZONA INTERTIDAL BAWAH (LOWER INTERTIDAL ZONE) DAERAH PADANG LAMUN DESA WAAI“. BIOPENDIX: Jurnal Biologi, Pendidikan dan Terapan 1, Nr. 1 (20.10.2014): 8–12. http://dx.doi.org/10.30598/biopendixvol1issue1page8-12.
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Background: Seagrass grows and spreads in nearly all parts of the intertidal zone. Waai village has characteristic sloping coastal water and have different patterns of zonation of seagrass in the intertidal zone's third-impact on the presence of seagrass and the organisms in it.
Methods: The study was conducted in coastal waters Waai village, in the middle of the intertidal zone (middle intertidal zone) and the lower intertidal zone (lower zone intertidal). The samples in this study are all kinds of gastropods found in each plot observation station of 100 plots. Gastropod species diversity using diversity index formula Shannon - Wiener referred to under Ludwig and Reynolds.
Results: From the results of the study found 8 species of gastropods and has a diversity index that is currently in the middle intertidal zone, the average diversity index of 1.76, while in the lower intertidal zone, the average gastropod diversity index was 1.45.
Conclusion: diversity index indicates the middle intertidal zone, the average diversity index of 1.76, while in the lower intertidal zone, the average index of diversity of gastropods is 1.45, this is caused by the different seagrass zonation patterns and habits of the people who frequently uses seagrass area for commercial purposes.
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MADIN, JOHN, BALU-ALAGAR VENMATHI MARAN und SUET-MUN HO. „Gastropods in the Intertidal Shore of Kota Kinabalu, Sabah (Malaysian Borneo)“. Borneo Journal of Resource Science and Technology 11, Nr. 1 (30.06.2021): 9–23. http://dx.doi.org/10.33736/bjrst.3371.2021.
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Intertidal gastropods provide numerous ecological benefits and are responsible for the dynamics of the intertidal shores habitat and its community assemblages. This study examined the community structure of gastropods in the intertidal shore located near the city of Kota Kinabalu, the capital of Sabah where coastal areas are rapidly developed for various purposes and consequently destroying natural habitats. A total of 36 gastropods species from 15 families were recorded. The Planaxis sulcatus was the most abundant species with a density of 480 ind. m-2 followed by Nodilittorina pyramidalis (182 ind. m-2) and Cellana radiata (97 ind. m-2) respectively. The number of species and their abundance, respectively, are almost three times lower than the number ever recorded for intertidal shores located in non-urban areas or remote locations. This suggests that the rapidly growing coastal urban areas threatening the diversity and abundance of intertidal gastropods. The density of gastropod (i.e. P. sulcatus & N. pyramidalis) was significantly (p<0.05) high at the lower intertidal shore where slope gradient is steeper with rocks and crevices are the major component of substrates compared to the upper or middle zone which is flatter and composed mainly of coral rubble and sand. Our study suggests that gastropod communities in intertidal shores located adjacent to the urban areas are threatened especially by anthropogenic factors such as frequent human visitations and modification of natural habitat. Future development in the intertidal shore should minimise habitat destruction and should consider infrastructures that encourage gastropod populations to grow and highlighting their ecological role for conservation reasons.
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Febrianti, Lulu, Imam Bachtiar und Karnan. „Diversity of Gastropods and Bivalvia Caught By Pemadak in The Intertidal Zone of Serinting Beach, Special Economic Zone Mandalika“. Jurnal Biologi Tropis 23, Nr. 1 (02.11.2023): 81–89. http://dx.doi.org/10.29303/jbt.v23i4b.5921.
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The intertidal area is utilized by coastal communities to collect intertidal biota during low tides, which is called “madak. Madak culture is also practiced by the people of Sumbawa. One of the groups of animals taken during madak are Gastropods and Bivalves from the Phylum Mollusca. Gastropods and Bivalves have many benefits for coastal communities. One of the direct benefits of Gastropods and Bivalves for society is consumption. This research focuses on the diversity that leads to the taxonomy of Gastropods and Bivalves caught by fishmen in the intertidal zone of Serinting Beach.The present study aims to analyze the diversity of Gastropods and Bivalves harvested during madak, to develop identification keys for harvested Gastropods and Bivalves, and to identify the amount of exploitation of Gastropods and Bivalves in madak. This study used a descriptive method of quantitative approach by purchasing Gastropods and Bivalves harvested by 5 madak-women in 5 days convenience (convenience sampling) The results found 5 orders, 11 families, and 28 species from 715 individuals of Gastropoda, while 2 orders, 3 families, and 4 species from 69 individuals of Bivalvia. Madak Gastropods and bivalves were used to develop identification keys. It was estimated that the number of Gastropods exploited was 3.348,4 individuals and bivalves were 351,6 individuals 1 per month.
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Saripantung, Gladys L., Jan FWS Tamanampo und Gaspar Manu. „Community Structure of Gastropod in Seagrass on Intertidal Area in The Tongkeina Village of Manado City“. JURNAL ILMIAH PLATAX 1, Nr. 3 (19.08.2013): 102. http://dx.doi.org/10.35800/jip.1.3.2013.2567.
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ABSTRACT Gastropod community is one of the important components of the food chain in the seagrass beds. The purpose of this study is to identify the types of gastropods and to determine population density, relative population density, species diversity, dominance and species associations of gastropod community at three study sites in Tongkeina, Manado city. The study sites were Bahowo, Batu Meja and Rap-Rap. Data were collected by sampling methods using quadratic transect technique. The study was conducted from November to December 2012. Over all, 20 species of gastropods comprising 7 families in 4 orders were collected. Among all sites, the highest density of 35,64 individuals/m2 was found in Bahowo site and the lowest density of 14,84 individuals/m2 was found in Rap-Rap site. The highest relative density was found at Batu Meja site, shown by Columbella versicolor species with relative density of 55.9%. Diversity index ranged from 1,4786 (Batu Meja) – 1,9382 (Rap-Rap). Batu Meja site shown an index value of C = 0,35 which indicating that there is dominance by 2 species, i.e.Columbella vesicolor and Columbella rusticoides, in that site.Associations between gastropod species at all three locations formed either positive or zero association, whereas negative associations between gastropod populations were not found. Keywords : community structure, gastropods, seagrass, Tongkeina, Manado ABSTRAK Komunitas gastropoda merupakan salah satu komponen penting dalam rantai makanan di padang lamun. Tujuan penelitian ini adalah mengidentifikasi jenis gastropoda dan mengetahui kepadatan populasi, kepadatan relative populasi, keanekaragaman spesies, dominasi dan asosiasi antar spesies gastropoda yang telah dilakukan pada tiga lokasi penelitian di kelurahan Tongkeina kota Manado. Pengambilan data dilakukan dengan metoda sampling yang menggunakan teknik transek kuadrat. Waktu penelitian pada bulan November sampai Desember 2012. Berdasarkan hasil penelitian, diperoleh 20 spesies gastropoda yang terdiri dari 7 famili dalam 4 ordo. Kepadatan tertinggi dari semua stasiun adalah Stasiun Bahowo yakni 35,64 ind/m2, Stasiun Rap-Rap adalah stasiun yang memiliki kepadatan terendah dari ketiga stasiun penelitian yakni 14,84 ind/m2. Kepadatan relative tertinggi terdapat di Stasiun 1 (Batu Meja) yaitu pada spesies Columbella versicolor dengan kepadatan relatif 55,9 %. Indeks keanekaragaman berkisar 1,4786 (Batu Meja)–1,9382 (Rap-Rap). Stasiun Batu Meja dengan nilai indeks C=0,35 menunjukan 2 spesies yang mendominasi yakni Columbella vesicolor dan Columbella rusticoides. Asosiasi antara spesies gastropoda di ketiga lokasi membentuk asosiasi positif dan asosiasi nol, sedangkan asosiasi negative antara populasi gastropoda tidak ditemukan. Kata kunci : struktur komunitas, gastropoda, lamun, Tongkeina, Manado
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Tongkeles, Sheyrel, Fransine B. Manginsela, Jety K. Rangan und Alex D. Kambey. „Gastropod Density and Diversity in the Intertidal Zone of Malalayang Beach, Manado“. JURNAL PERIKANAN DAN KELAUTAN TROPIS 10, Nr. 3 (20.01.2020): 121. http://dx.doi.org/10.35800/jpkt.10.3.2019.27533.
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This study held in Malalayang Beach Manado, aims to determine the density and diversity of Gastropods on the Malalayang coast of Manado. So the research objective is to find out the density and diversity of Gastropods in Malalayang Beach, Manado. The study using the line transect technique with 50 cm x 50 cm sized. The transect line is placed perpendicular to the coastline. The distance between the line transects is 20 meters. On each transect line 5 squares are placed. The distance between squares is determined using random numbers. Gastropod species found in Malalayang Beach Manado consist of 31 species and 17 genus, each consisting of the Archaeogastropoda that consists of 3 species, Mesogastropoda consists of 9 species, and the Order of the Neogastropoda of 19 species. The total density of Gastropods in Malalayang Beach in Manado is 6.27 individuals / m2 with diversity of 3.07, according to the criteria for diversity index of Malalayang coast having high diversity. Based on this, it is suggested that Manado Malalayang Beach can be maintained and carried out management that considers the feasibility of the environment as one of the requirements for sustainable development.Keywords: Gastropods, Density, Species DiversityABSTRAK Penelitian ini dilakukan di Pantai Malalayang Manado,berkaitan dengan permasalahan yang dikemukakan bagaimanakah kepadatan dan keanekaragaman Gastropoda di pantai Malalayang Manado. Maka tujuan penelitian adalah Mengetahui kepadatan dan keanekaragaman Gastropoda di Pantai Malalayang Manado. Pengumpulan data dengan pendekatan Teknik line transect menggunakan kuadrat berukuran 50cm x 50cm. Line transect diletakkan tegak lurus dengan garis pantai. Jarak antara line transect sebesar 20 meter. Pada masing- masing line transect diletakkan 5 kuadrat. Jarak antar kuadrat ditentukan dengan menggunakan angka acak. Spesies Gastropoda yang ditemukan di Pantai Malalayang Manado terdiri dari 31 spesies dan 17 genera yang masing-masing terdiri dari Ordo Archaeogastropoda 3 spesies, Ordo Mesogastropoda 9 spesies, dan Ordo Neogastropoda 19 spesies. Kepadatan total Gastropoda di Pantai Malalayang Manado 6.27 individu/m2 dengan keanekaragaman 3,07, Menurut kriteria indeks keanekaragaman pantai Malalayang memiliki keanekaragaman yang tinggi. Berdasarkan hal tersebut, maka disarankan agar Pantai Malalayang Manado dapat dijaga dan dilakukan pengelolaan yang mempertimbangkan sskelayakan lingkungan sebagai salah satu syarat pembangunan berkelanjutan.Kata kunci: Gastropoda, Kepadatan, Keanekaragaman Jenis
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Walker, Sally E. „Preservational constraints and ecological opportunities: the role of shell-inhabiting organisms in the fossil record“. Paleontological Society Special Publications 6 (1992): 302. http://dx.doi.org/10.1017/s2475262200008625.
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Biological parameters, in addition to physical parameters, are important in determining past ecology, taphonomy and the effects of human intervention. Research conducted on a Recent community of gastropods and two late Pleistocene fossil assemblages from Puerto Penasco, Mexico, reveal a complex pattern of interrelationships among gastropod shell users. First, shell representation is biased in the intertidal of Puerto Penasco, Mexico, because of a complex mosaic of secondary shell occupants. Hermit crabs (five species) represent almost half (47%) of the intertidal gastropod shell resource available throughout the year. Living snails are represented by 17 out of the 32 gastropod taxa. Additionally, hermit amphipods (three species) occupy ten gastropod taxa. Hermit crabs and hermit amphipods retain the shells in anomalous habitats (that differ from the living snail). Second, physical factors act as a temporal component which affects shell use and availability during the seasons at Puerto Penasco. Late winter storms mix-up the intertidal distribution of living gastropods and hermit crabs. Subtidal to low intertidal shells appear in the high intertidal; living snails are buried under a thick bed of sand. Most importantly, empty shells become available, and the hermit amphipod population peaks. Thus, physical factors contribute to the demise of living snails (i.e, burial by sand) and the mixing of shells. However, the organisms (hermit crabs and amphipods) maintain this motif by retaining the shells in the anomalous habitats.Third, all hermit crab species (Paguristes anahuacus, Pagurus lepidus, Paguristes roseus), except for one (the high intertidal, Clibanarius digueti), have epi-and endobionts associated with the gastropod shell. More than 20 species of invertebrates bore into or encrust the hermitted shells at Penasco. Of these, the encrusting bryozoans Hippothoa, Hippopodinella adpressa, ?Floridia antiqua, Lichenopora, Antropora tincta and the boring spionid polychaetes (Polydora commensalis, Polydora, Boccardia) and spirorbid polychaetes (Spirorbis; Serpula) are important bionts to use in recognizing hermit crab shell use in the fossil record of the northern Gulf of California. The encrusting bryozoans (H. adpressa and A. tincta) are present on Pleistocene gastropods at the unusual Pelican Point terrace deposit (large gastropod shells preserved among large bryozoan encrusted cobbles) indicating hermit crab inhabitation. These bryozoans appear to protect the gastropods from taphonomic alteration.Finally, reworked fossil shells occur within the hermit crab guild and the beach drift assemblage. Hermit crabs retain fossil shells of the moon snail, Polinices, (n=two occurrences) and Turritella (n=3 occurrences). These species are common in the coquina beach rock which makes up the intertidal substrate of Puerto Penasco. However, reworking of fossil coquina is quite substantial in the beach drift assemblage. Three sampling periods (=150 samples) indicate the following: three species of fossil bivalves (Chione, Trachvcardium and Glycimeris) and five species of fossil gastropods (Oliva, Polinices, Muricanthus, Nassarius, and Turritella) dominated the beach drift assemblage (over 16, 600 fossil whole shells/fragments). Fossil Chione represented the most shells (958 valves;>15,557 fragments). Recent bivalves were represented by 1115 shells/fragments (representing 12 species) and Recent gastropods contained mostly fragments (1069 pieces; 30 species). Additionally, the fossil gastropods were large, unlike the species that occur today, which have been picked over by humans. Thus, a large part of active beach deposition at Puerto Penasco contains late Pleistocene shells, taphonomically altered by secondary occupants and beachcombers.
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Dodiya, Dimpal, und Paresh Poriya. „Distribution Patterns of Key Gastropods (Mollusca) Species Along the Intertidal Zone of Adri Coast, Kathiawar Peninsula, India“. Environment and Ecology 41, Nr. 4 (Oktober 2023): 2266–73. http://dx.doi.org/10.60151/envec/whtv1322.
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Distribution patterns of key gastropod species were studied on a rocky-sandy intertidal zone of Adri coast of Kathiawar peninsula. The studied coast has an ideal habitat for intertidal ecological studies. It has rich marine faunal and floral diversity devoid of any anthropogenic pressure. The present study was focused on distribution pattern of dominating intertidal gastropods species that considered as the most communal inhabitants of the intertidal zone worldwide. The coast has both rocky and sandy intertidal area with rock crevices and small to large pools and puddles. Physico-chemical parameters of seawater and ecological attributes like density, abundance, and frequency of five gastropod species Astralium semicostatum, Cerithium caeruleum, Gyrenium natator, Nerita albicilla and Onchidium verruculatum have been studied. Result indicates that all the species have their distinct preference for intertidal microhabitats like rocks, puddles, crevices and different substrata. The species has different strategies for the selection of microhabitat for their survival particularly in extreme environment of low tide when desiccation is at maximum.
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Gemelli, F., C. R. Johnson und J. T. Wright. „Gastropod communities associated with different morphologies of the intertidal seaweed Hormosira banksii“. Marine and Freshwater Research 70, Nr. 2 (2019): 280. http://dx.doi.org/10.1071/mf18159.
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Hormosira banksii is an important intertidal habitat-forming seaweed in southern Australia that shows large variation in morphology. We examined the relationship between morphological variation in Hormosira and associated gastropod community structure, abundance and diversity in Tasmania, southern Australia. We sampled both Hormosira and gastropods from sites in two habitats (coast and estuary), two times (February–March and October–November) at two regions (northern and eastern Tasmania). There were distinct Hormosira morphs on the north coast (small individuals), east coast (intermediate sized individuals) and in estuaries (large individuals). Multivariate analysis showed that gastropod communities varied among the different algal morphologies, and suggest an influence of morphological traits, specifically thallus length, vesicle number and size, on the distribution patterns of gastropod species. Despite the finding of distinct gastropod communities associated with the different Hormosira morphs, because the different morphs occur in different locations with different physical conditions, we cannot unequivocally attribute the differences in gastropod communities to seaweed morphology per se. Nonetheless, our results confirm that H. banksii is an important foundation species in the intertidal zone and suggest a habitat-specific effect of algal morphological traits on gastropods.
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Wang, Jie, und Shuo Wang. „Variations of Supercooling Capacity in Intertidal Gastropods“. Animals 13, Nr. 4 (17.02.2023): 724. http://dx.doi.org/10.3390/ani13040724.
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Winter low-temperature confines species distribution. Intertidal gastropods are distributed from tropical to polar zones, facing variable intensities and durations of low temperatures. They usually set their supercooling points (SCPs) at high subzero temperatures to stimulate freezing. However, the variations in SCP in intertidal gastropods at intraspecific and interspecific levels remain poorly understood. Here, we measured the body size, cooling rate, and SCP of nine intertidal gastropod species in China. These species were distributed in high or middle intertidal zone with different geographic distributions. The average SCPs (−4.27~−7.10 °C) and the coefficients of variation of SCP (22.6%~45.9%) were high in all species. At the intraspecific level, the supercooling capacity was positively correlated with the cooling rate. Interspecifically, the supercooling capacity was closely related to the cooling rate, and also to the species’ geographical distribution. Northern high-shore species showed lower SCPs, while southern high-shore species had higher SCPs. There was no difference in SCP between widespread high- and mid-shore species. Our results indicated that the supercooling capability is potentially an adaptative response to the local winter temperatures, and the cooling rate is a factor in determining the difference in SCP at the intraspecific and interspecific levels.
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Setyono, Dwi Eny Djoko, Hollanda Arief Kusuma, Nandike Ayudiah Poeteri, Dietriech Geoffrey Bengen und Ferry Kurniawan. „DIVERSITY AND ABUNDANCE OF GASTROPODS IN THE INTERTIDAL ZONE OF WATUKARUNG, INDONESIA“. Marine Research in Indonesia 44, Nr. 1 (30.06.2019): 19–26. http://dx.doi.org/10.14203/mri.v44i1.529.
Annotation:
We present the density, diversity, and environmental conditions of gastropods in the Watukarung intertidal zone ? a coastal region of Pacitan Regency, Indonesia, adjoining the Indian Ocean. Gastropods play an important role in coastal ecosystems. In Watukarung, the local people collect marine organisms, including gastropods during low tide to supplement their income. Baseline information on the presence and abundance of gastropods in Watukarung are not available. Our survey collected 173 individuals of gastropod in the intertidal area of Watukarung that represent 8 families, 9 genera, and 13 species. Gastropod diversity index (H') in the three beaches (Ngalorombo, Pasir Putih, and Kasap) show varying values from the categories of low and medium species diversity. Although the data suggest that there should be a dominant species in the ecosystem (E < 0.5), there are no strong dominance species in the community (C < 0.5). Watukarung coastal waters are still in good condition for marine organisms with salinity > 31‰, DO > 8.1 mg/L, and pH > 8. The substrate is dominated by coarse sand. The total organic matter is relatively low (< 2.6%) due to characteristics of the substrate that is dominated by a rocky and sandy substrate. Based on the results, we suggest that Kasap beach can be established as a core zone considering its high diversity and density of gastropods as well as being distant from any residential area, whereas Ngalorombo and Pasir Putih beaches are suitable as usage zones for surfing tourism. We highlight the need for the local community, government, and private sector need to work together to encourage sustainably tourism while reducing environmental impacts in Watukarung.
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Azzahra Aulina, Medy Ompi, Erly Yosef Kaligis, Natalie Detty C. Rumampuk, Joice Rinefi T. S. L. Rimper und Grevo S. Gerung. „Gastropods in tidal of Bulo, Mandolang District, North Sulawesi“. Jurnal Ilmiah PLATAX 12, Nr. 1 (25.01.2024): 177–84. http://dx.doi.org/10.35800/jip.v12i1.51083.
Annotation:
A tidal area is a part of the coast that is influenced by the rise and fall of the tides. The area is a dynamic area, which experiences exposure to the air when low tide comes, easily mixed with fresh water in the rainy season and inundation. Marine flora and fauna that live in the area can adapt to it. The purpose of this study was to identify gastropod species and the density of each species that were found attached to the hard substratum in the tidal area of Bulo, Mandolang District, North Sulawesi. Data were collected by line transect and squared methods. Gastropod samples obtained were treated by using 70% alcohol. The length of each species was measured before being identified at the species level. The results show 175 individuals consisting of 30 species from 14 families were recorded. Substrat of rock and dead coral were covered and dominated the intertidal bottom. The highest density of Gastropods in the tidal area of Bulo, Mandolang District, North Sulawesi was the species of Cellana radiata. The density of Cellana radiata was 3.8 ind./m², while for the other 20 species of gastropods, each species was 0.07 ind./m². Physical and biological factors that affected the presence and density of gastropod species are discussed. Keywords: Gastropods; Density; Tidal; Mollusc; Bulo Village. Abstrak Daerah pasang surut adalah salah satu daera di pesisir yang dipengaruhi oleh air pasang tinggi dan rendah. Daerah ini adalah sebagai daerah yang dinamamis, di mana adalah daerah yang terekspos dengan sinar matahari pada saat pasang rendah, mudah bercampur dengan air tawar di saat musium hujan, serta daerah yang mudah dijangkau oleh masyarakat pensisir. Biota yang hidup di daerah ini memiliki kemampuan beradaptasi dengan perubahan-perubahan lingkungan ini. Tujuan penelitian ini adalah mengidentifikasi jenis-jenis Gastropoda dan mengetahui kepadatan jenis-jenis Gastropoda, yang menempati substrat keras di daerah pasang surut Bulo Kecamatan Mandolang, Sulawesi Utara. Pengumpulan data adalah dengan menggunakan metode ‘line transect’ dan kuadrat. Sampel Gastropoda yang didapatkan diberi alkohol 70%, Panjang masing-masing spesies diukur sebelum diidentifikasi pada tingkat spesies. Hasil penelitian menunjukkan bahwa ada 175 individu yang terdiri dari 30 spesies dari 14 famili. Kepadatan tertinggi Gastropoda di daerah pasang surut Bulo Kecamatan Mandolang, Sulawesi Utara adalah Cellana radiata yang memiliki kepadatan 3.8 ind./m2, sedangkan 20 jenis Gastropoda lainnya memiliki kepadatan untuk setiap jenis, yaitu 0.07 ind./m2. Kata kunci: Gastropoda; Kepadatan; Pasang Surut; Moluska; Desa Bulo.
15
Suganda, M. Tomy Aria, Karnan Karnan und Moh Liwa Ilhamdi. „The Community Structure of Gastropods (Mollusca Phylum) in The Intertidal Zone of Saung Beach, Wakan Village, Jerowaru District, East Lombok Regency“. Jurnal Biologi Tropis 24, Nr. 1 (18.03.2024): 515–25. http://dx.doi.org/10.29303/jbt.v24i1.6515.
Annotation:
Gastropods are one of the phylum Mollusca classes having a single shell, normally spiral-shaped. This research aimed to analyze the Gastropod community structure (Mollusca Phylum) in the Intertidal Zone of Wakan Village, Jerowaru District, East Lombok Regency. The combination of line and quadrat transect was implemented to take samples in this study. The variables in the research include the type and quantity of Gastropods. There were 1.715 individual of Gastropod found in this study. They were included in 11 families and 17 species. The Gastropod species with the highest abundance value in station I and II was Strombus urceus with the abundance value of 12,8 ind/m2 and 5,72 ind/m2, respectively. Meanwhile, in station III, it was Terebralia sulcate with the abundance value of 3,4 ind/m2. The diversity index of Gastropods in the research location was categorized as medium (H’=2,32) with a stable divercity index (E=0,84) and a low domination index (C=0,14).
16
Tanjung, Afrizal. „The Indication of Gastropods Extinctions at Intertidal Zone of the Teluk Nipah Waters, the Pesisir Selatan Regency the Province of the West Sumatera“. Jurnal Natur Indonesia 21, Nr. 1 (12.04.2023): 69. http://dx.doi.org/10.31258/jnat.21.1.69-74.
Annotation:
Intensive observation of gastropods, every March from the year 2008 to the year 2012, was carried out to document some indicators of gastropod extinction. The purposive sampling technic was used in this work. The physicochemical parameters of its habitat were also monitored during every sampling done. It was found that the intertidal substrate consist of sand, while the habitat parameters were more than 5,6 mg/L dissolved oxygen, pH around 7,0-7,2, salinity 30,2-32,2 ppt, temperature 28,6-29,60C, the visibility 100%. The number of species, the number of found gastropods, the abundance, and the maximum shell size of found gastropods showed decreasing from year to year, while routine collecting by the visitor and the marine organism shell collector, and the disturbance by the fisherman activities occurred. This indication showed a tendency for gastropods extinction
17
Hawan, Florensia Keneka, Novi Ivonne Bullu und Apriliana Ballo. „Identifikasi Jenis Gastropoda Pada Zona Intertidal Pantai Deri Dan Pantai Watotena Kecamatan Ile Boleng Kabupaten Flores Timur“. Bioma : Berkala Ilmiah Biologi 22, Nr. 1 (27.06.2020): 15–25. http://dx.doi.org/10.14710/bioma.22.1.15-25.
Annotation:
Gastropods are the class with the largest number of species, because it is a class of mollusk phylum that is most successfulin adapting to various types of marine and freshwater habitats to the terrestrial environment. The research was carried out on the identification of the types of gastropods in the Deri Beach and Watotena Beach with the aim to determine the type of gastropods in the region. The result of researchon the identification of the types of gastropods in the intertidal zone of Deri Beach and Watotena Beach found 9 types of gastropods, including Cypraea caputserpentis 14 individuals, Cypraea moneta 50 individuals, Nerita albicilla 86 individuals, Nerita polita 52 individuals, Nerita costata 39 individuals, Conus flavidus 24 individuals, Cantharus undosus 10 individuals, Morula granulate 213 individuals dan Drupa morum 25 individuals. The result of the calculation of the density obtained the highest density on these two beaches there is the type of Morula granulate which is equal to 2,36 ind/m2 in Deri Beach with a relative density of 60,6%. Based on the calculation of values on both beaches this is categorized as having low diversity because the H’ < 1. Furthermore, in the calculation of the dominance index, values are found on both beaches close to 0 so it is categorized low. In addition, measurements were also taken environmental parameters which include temperature, salinity, pH, and turbidity which result shows that Deri Beach and Watotena Beach have decent conditions for gastropod life.
18
Tyler, Carrie L., E. S. Stafford und L. R. Leighton. „The utility of wax replicas as a measure of crab attack frequency in the rocky intertidal“. Journal of the Marine Biological Association of the United Kingdom 95, Nr. 2 (09.09.2014): 361–69. http://dx.doi.org/10.1017/s0025315414001210.
Annotation:
Crabs are thought to play a vital role in structuring gastropod populations. Studies quantifying the frequencies with which crabs attack gastropods in natural settings are, however, scarce. Although a wide variety of techniques exist with which predator–prey interactions can be investigated (e.g. laboratory experiments, exclusion caging, tethering and population surveys), there is a need for methods that can provide large amounts of quantitative data, particularly documenting the frequency with which crabs attack gastropods. This study examines the utility of using wax replicas of gastropods to determine crab attack frequencies. Replicas ofChlorostoma funebralis, Nucella ostrinaandNucella lamellosawere bolted to mesh screens and deployed in the rocky intertidal. Crabs attacked wax replicas of gastropods, leaving characteristic marks in the wax. In most cases, the appendage used in the attack could be identified from the marks (i.e. chelae vs walking legs). The effectiveness of this technique was verified using surveys of repair scar frequencies of the gastropod populations; patterns in attack frequency, determined from the number of marked wax replicas, were consistent with those of repair frequency, in that both were greater at the wave protected, quiet water locality. This study confirms the value of wax replicas in investigations of crab predation to determine the frequency and type of attack, and illustrates the potential of this method for quantifying predation intensity. The development of techniques that quantify the magnitude and exact nature of the effects of crab predation on intertidal communities is pivotal, given the intensity of commercial fishing of some species of crabs.
19
Chagas, Rafael Anaisce das, und Marko Herrmann. „Evidence of non-drilling predation by a naticid gastropod in bivalves on Camocim Beach, Ceará, northeastern Brazil“. Acta Scientiarum. Biological Sciences 43 (19.04.2021): e50567. http://dx.doi.org/10.4025/actascibiolsci.v43i1.50567.
Annotation:
Marine gastropods of the family Naticidae are worldwide distributed and known for their unusual predatory habits. Due to their wide distribution, the naticids are worldwide studied and known like predators of intertidal bivalves. The present study demonstrates the predation of the naticid gastropod Natica marochiensis on the bivalve Donax striatus in the northeastern region of Brazil.
20
Tuaputty, Hasan, Tri Santy Kurnia und Syahran Wael. „Association patterns of seagrass with gastropods types in the intertidal zone of coastal waters, Suli village, Salahutu district, Ambon island“. BIOEDUPAT: Pattimura Journal of Biology and Learning 1, Nr. 2 (18.10.2021): 50–56. http://dx.doi.org/10.30598/bioedupat.v1.i2.pp50-56.
Annotation:
Seagrass beds play an important role in coastal aquatic ecosystems and are one of the tidal areas that are widely used by the community as a forum for the interests of educational institutions in research activities, conservation of various marine biota. Ecologically, the seagrass ecosystem acts as a shelter and a place to eat various marine biota, including gastropods. The purpose of this research is not only to explore the diversity of gastropods, but also to examine the interactions of gastropod species, both between the same species and between different species in a community of seagrass ecosystems. The diversity index calculation shows the diversity index value H = 3.982 > 3, this means that the diversity of gastropod species is quite good. The results of the basic analysis obtained the calculated X2 value of 0.656, > X2 table with a significant level of 0.05%. There is an association relationship between seagrass ecosystems and the types of gastropods that live in seagrass ecosystems in coastal waters of Suli Village, Ambon.
Keywords: Gastropods, Seagrass meadows, Association
21
Oriza, Syucitra, Afrizal Tanjung und Elizal Elizal. „GASTROPOD COMMUNITY STRUCTURE IN THE INTERTIDAL ZONE OF PASUMPAHAN ISLAND, PADANG CITY, WEST SUMATRA PROVINCE“. Asian Journal of Aquatic Sciences 6, Nr. 1 (31.03.2023): 41–49. http://dx.doi.org/10.31258/ajoas.6.1.41-49.
Annotation:
Pasumpahan Island is one of the islands located in West Sumatra Province which has various activities of daily life, especially in the intertidal zone; it is suspected that it can interfere with the existence of aquatic organisms one of which is gastropods. Studying the structure of gastropod communities in the intertidal zone is an interesting natural laboratory to study. This research was conducted from December 2021 to January 2022 on Pasumpahan Island Padang City West Sumatra Province. The purpose of this study was to determine the structure of the gastropod community which includes species, abundance, diversity, uniformity, dominance, and distribution pattern of gastropods. As supporting data in this study, several environmental parameters were also measured which included water quality, sediment type, and sediment organic matter content. The research method used is a survey method, where sampling using the quadrat transect method is carried out at 3 stations. Based on the results of the study found 13 species of gastropods. The most common species found at all stations was Pythia scarabaeus, where the gastropod abundance values obtained between stations ranged from 2,78 to 5,00 ind/m2. The value of the species diversity index ranged from 1,50 to 2,02, which was moderate, the uniformity index value ranged from 0,77 to 0,88, which was high uniformity, and the dominance index value ranged from 0,16 to 0,29, meaning that there were no species found dominates and the value of the distribution pattern ranges from 1,31 to 2,47 with a clustered distribution pattern
22
Dhruvi, Patel, Patel Krupal, Patel Pooja und Jigneshkumar Trivedi. „Shell utilization pattern by the hermit crab Diogenes custos (Fabricius, 1798) along Gulf of Kachchh, Gujarat, India“. Journal of Biological Studies 3, Nr. 2 (01.09.2020): 79–95. http://dx.doi.org/10.62400/jbs.v3i2.5141.
Annotation:
Present work aims to study the gastropod shell utilization pattern of hermit crab Diogenes custos in the intertidal zone of Gulf of Kachchh, Gujarat, India. Hermit crab specimens were collected randomly during the low tide timings using hand picking method in February 2019 and November 2019. Data on abundance of common gastropod species were also collected using a quadrate sampling method. Hermit crab wet weight (HW) and their shield length (SL) (represent the size of the hermit crabs) were measured. Gastropod shells were identified up to species level and different morphological characters such as shell dry weight (DW), shell length (SHL), shell volume (SHV), shell aperture length (SAL), and shell aperture width (SAW) were measured. Total 2000 individuals of D. Custos, 1171 males (58.6%), 763 females (38.1%) and 66 ovigerous females (3.3%) occupying 49 species of gastropods were collected. Pollia undosa (21.9%) was highly occupied by D. custos followed by Cantharus spiralis (14.5%), Tenguella granulata (9.9%), Chicoreus virgineus (6.45%), Cerithium caeruleum (6.05%) and Nassarius distortus (6.05%). Regression analysis carried out between D. custos morphological characters and gastropod shell morphological characters showed a strong relationship which suggests that shell architecture plays an important role in shell utilization pattern of Diogenes custos. The abundance of Pollia undosa was very high in the intertidal zone as compared to other commonly occupied gastropods species which also suggests that gastropod shell availability in the habitat also has pronounced effect on shell utilization pattern of D. custos.
23
Dolorosa, Roger G., Rafael M. Picardal und Segundo F. Conales. „Bivalves and gastropods of Tubbataha Reefs Natural Park, Philippines“. Check List 11, Nr. 1 (01.01.2015): 1506. http://dx.doi.org/10.15560/11.1.1506.
Annotation:
In this study of marine bivalves and gastropods of Tubbataha Reefs Natural Park (TRNP), Palawan, Philippines, we photo-document 96 species, including 17 species of bivalves (in seven families), and 79 species of gastropods (in 29 families). Of these, 64 species (eight bivalves and 56 gastropods species) were new recorded from the park. The list also includes the seven species of giant clams which are protected under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) and three nationally protected gastropod species (Cassis cornuta, Charonia tritonis and Tectus niloticus). Thirty-six species that were previously reported at the park were not found in this study, which suggests that there are at least 132 species of gastropods and bivalves at TRNP. Our observations were limited at intertidal and shallow subtidal reefs in the park, suggesting that the number of species in the list may rise with an extensive survey.
24
Boulding, E. G., S. Behrens Yamada, S. S. Schooler und A. L. Shanks. „Periodic invasions during El Niño events by the predatory lined shore crab (Pachygrapsus crassipes): forecasted effects of its establishment on direct-developing indigenous prey species (Littorina spp.)“. Canadian Journal of Zoology 98, Nr. 12 (Dezember 2020): 787–97. http://dx.doi.org/10.1139/cjz-2019-0250.
Annotation:
Coevolutionary arms races between shelled gastropods and their predators are more escalated near the equator. Therefore, temperate gastropods are predicted to be maladapted to highly specialized tropical shell-crushing crabs. The northern geographical limit of the lined shore crab (Pachygrapsus crassipes J.W. Randall, 1840) does not usually overlap with the southern limit of the Sitka periwinkle (Littorina sitkana Philippi, 1846), which lacks a pelagic larval stage. Large El Niño events increased the winter abundance and poleward transport of P. crassipes larvae from California (USA) in the Davidson Current. Temporary intertidal crab populations that included females with eggs were observed 1–4 years later, >1000 km north of its usual geographical range. Laboratory experiments showed that L. sitkana did not have a size refuge from adult P. crassipes. Moreover, consumption rates of adult L. sitkana by P. crassipes were 10-fold higher than those published for indigenous purple shore crabs (Hemigrapsus nudus (Dana, 1851)) with similar claw sizes. Additionally, the upper intertidal limit of invading P. crassipes was higher than that of H. nudus. Consequently, the invasion of P. crassipes reduced the width of L. sitkana‘s spatial refuge from predation. The permanent presence of this subtropical predator could reduce the intertidal distribution of this temperate gastropod, thereby causing contraction of its southern range limit.
25
Colares, Renato, Thuany Machado, Filipe Machado Patel, Natália da Silva Brunelli, Letícia Costa Viana, Rafael Martins, Pedro Augusto dos Santos Longo und Mainara Figueiredo Cascaes. „REDE ECOLÓGICA DOS GASTRÓPODES ASSOCIADOS AO BANCO DE ALGAS DA PRAIA DA RIBANCEIRA, SANTA CATARINA, BRASIL“. Oecologia Australis 25, Nr. 01 (15.03.2021): 47–58. http://dx.doi.org/10.4257/oeco.2021.2501.05.
Annotation:
Among the rocky shores’ biota, the networks of interaction between macroalgae and associated organisms, especially gastropods, stand out. In order to contribute to the understanding of the ecology of rocky shores, this study aims to evaluate the relation between macroalgae and associated gastropods in Ribanceira Beach, Imbituba, Santa Catarina, Brazil. The survey of algae samples took place in a wet season, using 20 cm x 20 cm quadrants, allocated in 18 transects distributed equally in the infra and mesolittoral zones, with five points each. In the laboratory, algae were screened and associated gastropods identified. Concepts of network theory were applied for a better understanding of interactions among organisms, where connectance descriptors, niche overlap and centrality index for each species were calculated. Multivariate techniques were used to assess the significance of intertidal zones, morphofunctional group and other variables in the composition of the associated gastropods. The sampling resulted in a total of 1.466 gastropods, distributed in 14 species and nine families. In relation to the macroalgae, 14 species were identified, with seven presenting associated gastropods. The ecological network showed low connectance and niche overlap for both levels (gastropods and macroalgae), suggesting the existence of many specific interactions. The centrality values highlighted Eulithidium affine (C.B. Adams, 1850) and Sargassum cymosum C. Agardh as key species in the studied network. The mass and morphofunctional group of the macroalgae sampled showed influence in the composition of the associated community. Cortical algae, especially S. cymosum, stood out with high levels of species richness and species density of associated gastropods, suggesting importance in the structural complexity of macroalgae for gastropods. The non-significant effect of the tidal zone for the gastropod composition was highlighted, suggesting that the nesting and foraging stability provided by the macroalgae allows the same gastropod species to occur in both infralittoral and mesolittoral zones.
26
Buršić, Moira, Ljiljana Iveša, Andrej Jaklin, Milvana Arko Pijevac, Branka Bruvo Mađarić, Lucija Neal, Emina Pustijanac, Petra Burić, Neven Iveša und Paolo Paliaga. „Changes in Composition of Mollusks within Corallina officinalis Turfs in South Istria, Adriatic Sea, as a Response to Anthropogenic Impact“. Diversity 15, Nr. 8 (18.08.2023): 939. http://dx.doi.org/10.3390/d15080939.
Annotation:
A very common intertidal alga, Corallina officinalis, serves as a refuge for numerous invertebrates within its settlements. The composition and structure of invertebrates may differ in relation to different natural or human-induced stress, and this study examined the effects of anthropogenic impact on the abundance and diversity of mollusks residing within C. officinalis settlements. Sampling was conducted during two seasons (Season 1 = algae’s maximum vegetation growth and Season 2 = algae’s minimum vegetation growth). Gastropods and bivalves made up 50% of all invertebrates identified, with a total of 47 species of gastropods, 25 species of bivalves, and one polyplacophoran species recorded. Considering the overall count of individuals, 4562 gastropods, 21,738 bivalves, and 260 polyplacophorans were collected from all available Corallina samples. The results indicated that locations under human impact showed a reduced number of the most abundant gastropod and bivalve species and a reduced average number of individuals.
27
Sahrin, Ella Fizh, Sri Jayanthi, Silvia Wardania, Sahna Maulana Sitakar, Muliani Tiana Sari und Rauzatul Jannah. „Study of The Gastropoda Community in Cermin Coast, Paya Dua Village, Peudawa District, East Aceh District, Aceh“. Jurnal Biologi Tropis 23, Nr. 2 (19.12.2023): 345–51. http://dx.doi.org/10.29303/jbt.v23i2.6205.
Annotation:
Cermin Beach is one of the beaches that has an abundant level of diversity and abundance of biota, one of which is the level of diversity of gastropods which have many roles as key organizations in food networks in waters. Gastropods as organisms that live in waters are very sensitive to changes in the water quality where they live. This research was conducted on November 25 2023 with the aim of knowing the types of Gastropods found at Cermin Beach, Paya Dua Village, Peudawa District and to determine the structure of the Gastropod community related to individual density, relative abundance, frequency of presence, diversity, evenness, and similarity of species by applying a survey method with primary data collection carried out using the Line Transet method, namely by walking along the intertidal zone along the specified transect line. The results show that at Cermin Beach in Paya Dua Village, Peudawa District, 46 species of gastropods were found with different numbers at each station. The relationship between physical and chemical factors in Cermin Beach waters also influences the diversity of Gastopoda.
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Pratama, Muhammad Dandy Syifa, Syafruddin Nasution und Efriyeldi Efriyeldi. „DISTRIBUTION AND DIVERSITY OF GASTROPODS (MOLLUSCS) IN INTERTIDAL WATERS IN RUPAT SUBDISTRICT, BENGKALIS DISTRICT“. Asian Journal of Aquatic Sciences 6, Nr. 2 (14.08.2023): 265–73. http://dx.doi.org/10.31258/ajoas.6.2.265-273.
Annotation:
This study aims to determine the distribution pattern and diversity of gastropods in the Intertidal Waters of the Rupat Timur District. The research was conducted in February 2022. The research location consisted of 3 stations, each station was placed 3 transects from the highest tide to the lowest tide at different distances. Along the transect lines were placed 3 plots with a size of 3 x 3 m and each plot has a subplot with a size of 1 x 1 m. The method used in this research is the survey method. Parameters measured include gastropod species, distribution patterns, diversity, abundance, relative abundance, and water quality. The results of the study found gastropod species consisting of 9 (nine) families, 12 (twelve) genera, and 13 (thirteen) species. The distribution pattern of gastropods in the research location is clustered with the value of diversity (H') at a moderate level of diversity. Diversity is categorized as moderate. The highest abundance of gastropods was found on the beach of Sukarjo Mesim Village (a station I) with an abundance value of 25,600 ind/ha and the lowest abundance was found on the beach of Teluk Lecah Village (station III) with an abundance value of 11,100 ind/ha, while the highest abundance of gastropods between intertidal subzones was in the upper zone with an abundance value of 20,400 ind/ha and the lowest abundance was in the lower zone with an abundance value of 12,200 ind/ha. The highest relative abundance was Indothais javanica species with a relative abundance value of 18.30%, while the lowest relative abundance was Oliva ornata species with a relative abundance value of 0.85%. Temperature 29-30o C; salinity 28-30 ppt; pH 5-6; DO 5.2-6.4 mg/l. Sediment type in the station I was dominated by mud, station II was dominated by muddy sand and station III was dominated by sand with total sediment organic matter content of 0.46-23.33%.
29
Harif, Ichwanul, Afrizal Tanjung und Elizal Elizal. „Abundance and Distribution Patterns of Gastropods in the Intertidal Bay of Kambang Lengayang Sub-District, Southern Coastal District, West Sumatera“. Jurnal Natur Indonesia 19, Nr. 2 (15.03.2022): 37. http://dx.doi.org/10.31258/jnat.19.2.37-42.
Annotation:
This study aims to determine the abundance and distribution pattern of gastropods in the intertidal bay, Kambang Lengayang District, Pesisir Selatan Regency, West Sumatra. The benefits of this research are expected to be a reference or information for further research in Kambang Bay which in the end is expected to minimize the adverse effects of gastropod hunting. The research method used in this study is a survey method, namely direct observation and sampling which is divided into 3 stations where the sampling station 1 is taking in the coastal waters of the bay in an area where there is no community activity, station 2 is taking in the waters of the bay in the fishing trawl area. station 3 taking in the coastal waters of Kambang in the reclamation area. Based on the analysis of organic sedimentary material in the study area, the average value was obtained at station 1 (3.55%), station 2 (4.20%) and station 3 (3.33%). Based on the analysis, the sediment fraction that dominates each station is sand. The gastropods found at the study site were Clypeomorus bifasciata, Littoraria scabra and Cerithulata cingulata. The abundance of gastropods in the coastal waters of Kambang ranged from 2.33 to 5.00 Ind/m2. The results of the ANOVA test showed that the abundance of gastropods in the bay waters showed 0.214 beaches, indicating that the difference in abundance between stations was not significant. The gastropod pattern found at the study site is generally in groups.
30
Kolibongso, Duaitd, Frida A. Loinenak und Agnestesya Manuputty. „Diversity and density of marine intertidal gastropods in tropical seagrass beds at Oransbari Bay, South Manokwari - West Papua“. Depik 12, Nr. 3 (26.12.2023): 320–28. http://dx.doi.org/10.13170/depik.12.3.31138.
Annotation:
Gastropod communities are one of the important components of the food chain in seagrass meadows. This study aims to investigate the diversity of gastropods in the distribution of the seagrass beds at Oransbari Bay. This study was carried out in November 2022, using the line transect method. Data collection is carried out at three stations, where each station is divided into three transects. A total of 36 species consisting of 16 families and 5 orders, were recorded in this study. The total density of gastropods found in the waters of Oransbari Bay ranged from 5.77-9.43 ind/m2, with an average of 6.99 ± 2.10 ind/m2. Conus sp. has the highest density value of any gastropod. Meanwhile, for seagrasses, five species from four clans and two families were obtained. The percent cover of seagrass ranges from 17.05 ± 3.30% – 58.90 ± 22.90% with an average of 40.18 ± 21.3%. Halophila minor and Thallasia hempricii showed a positive correlation with gastropod density. The value of the gastropod diversity index is in the medium category, the gastropod evenness index is in the stable category, and the gastropod dominance index is in the low category. The results of this study provide a base for a proper gastropod checklist at Oransbari Bay. Future research is recommended that involves a more detailed studies on the feeding ecology and habitat preference of the gastropods.Keywords:DiversityDistributionGastropodsSeagrass bedsOransbari bay
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Salmanu, Sriyanti. „KEKAYAAN DAN KEPADATAN GASTROPODA BERDASARKAN TIPE PANTAI DI PERAIRAN PANTAI DESA SULI DAN WAAI KABUPATEN MALUKU TENGAH“. BIOPENDIX: Jurnal Biologi, Pendidikan dan Terapan 1, Nr. 2 (14.03.2015): 112–16. http://dx.doi.org/10.30598/biopendixvol1issue2page112-116.
Annotation:
Background: Type of coastal waters Suli village and village Waai is vegetated Beach, the beach is overgrown by vegetation beach. Coastal vegetation was found growing along the coastline is a mangrove and seagrass. Species richness index is a measure of the wealth of species that depend on the direct relationship between the logarithm of the number of species and area sampling. The population density of animals depends on the number of animals is regulated through intra- and interspecific relationships resulting directly from feedback density. Ecologically, seagrass acts as a major manufacturer in the food chain.
Methods: This study is a descriptive study was conducted using a survey. The variables to be studied is the richness and density of gastropods in the intertidal zone Suli village and village Waai Central Maluku district. Species richness index calculated by the formulation Margalef.
Results: Result: The gastropod wealth index in coastal waters of Suli Village is 0.77 and Waai village is 0.72. It can be interpreted that the index of wealth in both coastal waters is bad. The absolute density of gastropods in the coastal waters of Suli village was 30.02 and the absorbance of gastropods in the coastal waters of Waai village was 22.42.
Conclusion: Wealth gastropods in coastal waters Suli village and village Waai categorized as bad as wealth index is less than 2.5, while the density of gastropods in coastal waters Suli village and village Waai are at a high level. This situation is caused by the type of vegetation seagrass gastropods which are Suli village gastropod found as many as 13 types and villages Waai found 8 species and a number of individual lot.
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Lestari, Dian Fita, Fatimatuzzahra Fatimatuzzahra und Syukriah Syukriah. „Jenis-Jenis Gastropoda di Zona Intertidal Pantai Indrayanti Yogyakarta“. Journal of Science and Applicative Technology 5, Nr. 1 (24.05.2021): 187. http://dx.doi.org/10.35472/jsat.v5i1.301.
Annotation:
Gunung Kidul is one of the districts in Yogyakarta that has a long coastline with coral substrate and white sand. One of the beaches with coral and rocky substrates is Indrayanti Beach. The rocky substrate provides unique characteristics for the life of marine organisms in the intertidal zone. Gastropods is one of the seven classes in the Mollusc phylum. Gastropods are found mostly in the sea and fresh water, especially in the intertidal zone of beach. The aim of this study is to identify gastropods that found in the Indrayanti intertidal zone and classifying each species. The method of this study is observation and sampling techniques with accidental sampling at low tide. Data analysis is descriptive based on morphological characteristics of each species. Based on the results of this study, there are 5 sub-classes, 9 orders, 2 Superfamily, 21 families, 35 genera and 72 species. Sub-classes found are heterobranchia, caenogastropods, neritimorpha, vestigastropods, and patelogastropods. The highest number of species found in the caenogastropod subclass was 32 species (44% of the total species) which were dominated by the order of neogastropod.
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Chim, C. K., H. P. S. Wong und K. S. Tan. „Tetraclita (Cirripedia, Thoracica) tests as an important habitat for intertidal isopods and other marine and semi-terrestrial fauna on tropical rocky shores“. Crustaceana 89, Nr. 9 (2016): 985–1040. http://dx.doi.org/10.1163/15685403-00003567.
Annotation:
The barnaclesTetraclita singaporensisandT. squamosahave a thick test to protect the animals against the diverse environmental stress of the tropical intertidal zone and also against predation by muricid gastropods. After the death of the barnacle, however, the empty test is often taken over by other marine fauna as well as semi-terrestrial animals. The sphaeromatid isopodDynamenella ptychurawas the most abundant inhabitant in empty tests observed in Singapore and Malaysia. Ovigerous crustaceans were common. Gastropod specimens comprised almost entirely juveniles of common intertidal species, including those of the littorinidsLittoraria articulataandL. strigata. Gastropod eggs and veligers, insect larvae, pupae and nymphs, and spider spiderlings and immatures were also present. The haminoeid gastropodSmaragdinellawas the dominant animal colonizing barnacles in a succession experiment. Temperature was significantly lower inside the empty test than outside, by 0.2°C. Almost 40% of the barnacle tests remained attached to the substratum for more than four months after the death of the individuals.
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Janetzki, Nathan, Kirsten Benkendorff und Peter G. Fairweather. „Where three snail species attach while emersed in relation to heterogenous substrate temperatures underneath intertidal boulders“. PeerJ 9 (09.07.2021): e11675. http://dx.doi.org/10.7717/peerj.11675.
Annotation:
Mobile intertidal gastropods can employ behavioural thermoregulation to mitigate thermal stress, which may include retreating under boulders when emersed. However, little is known about how gastropod occupancy of under-boulder habitats is associated with any variations in substrate temperature that exist under boulders. Thermal imagery was used to measure the temperature of boulder lower surfaces and investigate how three snail species were associated at low tide with the maximum and average temperatures underneath grey siltstone and quartzite. Lower boulder surfaces had heterogeneous temperatures, with grey siltstone having temperature gradients and quartzite temperature showing mosaics. Temperature differences between the hottest and coolest gradient or mosaic locations were >5 °C; thus there was a range of temperatures that snails could interact with. All three snail species occupied cooler parts of temperature mosaics or gradients, avoiding the hottest areas. Stronger associations were detected on the hotter grey siltstone and for the more-thermally sensitive Nerita atramentosa and Diloma concameratum. Even though snails were associated with cooler areas, some individuals were still exposed to extreme substratum heat (>50 °C). These results suggest that gastropod thermoregulatory behaviour is far more complex than simply retreating underneath boulders at low tide, as there is also a range of under-boulder temperatures that they interact with. Untangling interactions between intertidal gastropods and heterogenous substrate temperatures is important given rocky seashores already represent a thermally-variable and potentially-stressful habitat, which may be exacerbated further given predictions of warming temperatures associated with climate change.
35
Chapperon, Coraline, und Laurent Seuront. „Cue synergy in Littorina littorea navigation following wave dislodgement“. Journal of the Marine Biological Association of the United Kingdom 89, Nr. 6 (20.04.2009): 1133–36. http://dx.doi.org/10.1017/s0025315409000150.
Annotation:
Under the assumption that dislodged intertidal gastropods have developed some adaptations to return to their original habitat, we investigated the cues involved in the navigation ability of Littorina littorea, following a simulated wave-dislodgement. Return rates decreased by 2 and 4-fold in the absence of chemical cues at the surface of the sediment and the rock, respectively. The 19-fold decrease in return rates observed in the absence of both cues suggests their synergistic effect on L. littorea navigation. Chemoreception might be much more involved in the navigation and the survival of intertidal gastropods following wave dislodgement than previously thought.
36
Dodiya, Dimpal, und Paresh Poriya. „Correlating Distribution Patterns of Intertidal Gastropods with Physicochemical Parameters along the Adri Coast of Gujarat, India“. European Journal of Theoretical and Applied Sciences 2, Nr. 3 (01.05.2024): 235–43. http://dx.doi.org/10.59324/ejtas.2024.2(3).20.
Annotation:
The present study was carried out to assess the impacts of various physicochemical parameters on the distribution patterns of gastropod species in intertidal zone of Adri coast of Gujarat. Intertidal zones along the Adri coast are rocky and sandy, with small to large pools and puddles as well as rock crevices. Ecological attributes such as the density, abundance, and frequency of the common gastropod species were studied along with the physicochemical parameters of seawater. The result indicates that all the species have distinct spatiotemporal variations for different seasons in the different intertidal zones i.e. upper, middle, and lower zones. Different physicochemical parameters are tolerated to some extent by the gastropod species. Both salinity and temperature specifies a direct positive correlation with the density, abundance, and frequency of intertidal gastropod species. Conversely, pH shows a moderately negative correlation with the distribution pattern and diversity attributes of gastropod species.
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Caril, AN, RL Vergara, RRC Santos, MLA Estandarte, J. Bernabe, MJ Aggabao, PC Bantigue, A. Guinto und NA Saguil. „Diversity of marine macro molluscan bivalves and gastropods in the intertidal areas of Barangay Paniman, Caramoan, Camarines Sur, Philippines“. IOP Conference Series: Earth and Environmental Science 1278, Nr. 1 (01.12.2023): 012010. http://dx.doi.org/10.1088/1755-1315/1278/1/012010.
Annotation:
Abstract There have been very few studies on mollusk diversity in remote areas of the Philippines. The coastal areas of Caramoan, Camarines Sur, are ideal for studying marine molluscs because they have been discovered to be abundant, diverse, and essential to the locals’ livelihood. However, due to the remoteness of the mentioned area, this lack of information remains scientifically lacking. Thus, this study aimed to determine the diversity of marine macro-molluscan bivalves and gastropods in the intertidal areas of Barangay Paniman, Caramoan, Camarines Sur, Philippines. Purposive sampling and transect methods assessed the species composition, abundance, and occurrence of marine macro bivalves and gastropods. The Shannon-Wiener index was used to determine the area’s diversity. A total of 557 individual molluscs were sampled and classified, obtaining 43 species of bivalves from 32 genera and 18 families and 47 species of gastropods from 34 genera and 20 families. The family Veneridae had the highest among the bivalves, and the family Strombidae had the highest species richness among the gastropods. This study provided baseline information on the status of marine macro molluscan bivalves and gastropods in the intertidal area of Barangay Paniman, Caramoan, Camarines Sur, Philippines. As a result, this will provide solid empirical evidence for conservation and sustainability plans.
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Hermanses, Evelina, Jety K. Rangan und Alex D. Kambey. „Gastropod Community In The Intertidal Of Likupang Coast, Kampung Ambon, East Likupang District, North Minahasa Regency“. JURNAL ILMIAH PLATAX 6, Nr. 2 (31.07.2018): 58. http://dx.doi.org/10.35800/jip.6.2.2018.20623.
Annotation:
This study was aimed at finding Gastropod species and studying the community structure in the coastal area of Kampung Ambon, Likupang, through species density, diversity, evenness and dominance analyses. It was carried out in August 2017. The study employed transect method with quadrats by placing the on the area covered with coral-sand mix substrates. Density analysis found total numbers of 168 individuals with mean density of 7 ind/m². Spesies of the highest indiviual numbers was Cypraea annulus with a total of 98 individuals. Species diversity (H’) was 0.632773. This value reflects that the species diversity is moderate. Species richness index was R ˃ 4 reflecting that there is high species richness. Species evenness index was ˃ 0,5 meaning that the gastropods in the area are sufficiently even. Dominance index ranged from 0.27 to 0.47 indicating no species dominance in the study site.Key Words : Gastropod, density, diversity, evenness, dominance ABSTRAKTujuan dari penelitian ini adalah mempelajari jenis-jenis gastropoda apa saja yang ditemukan dan mempelajari struktur komunitas melalui analisis kepadatan, keanekaragaman, kekayaan, kemerataan, dan dominasi spesies di daerah intertidal perairan Kampung Ambong Likupang. Penelitian dilaksanakan pada bulan Agustus 2017. menempatkan pada satu macam habitat yaitu kawasan yang didominasi oleh substrat karang yang bercampur pasir. Hasil analisis kepadatan menunjukkan bahwa di ketiga transek pengamatan jumlah individu yang diperoleh berjumlah 168 individu dengan kepadatan rata-rata per kuadrat 7 ind/m². Spesies dengan individu yang terbanyak adalah Cypraea annulus dengan jumlah individu sebanyak 98 individu. Keanekaragaman spesies yang diperoleh yaitu H’ = 0.632773. Nilai ini tergolong pada tingkat keanekaragaman sedang. Indeks kekayaan diperoleh nilai R ˃ 4, kriteria ini tergolong pada indeks kekayaan yang tinggi. Indeks kemerataan spesies diperoleh nilai ˃ 0,5 yang berarti spesies yang ada cukup merata, dan indeks dominasi diperoleh pada kisaran 0,27 – 0,47 yang menunjukkan tidak ada dominansi spesies di lokasi penelitian.Kata Kunci : Gastropoda, kepadatan, keanekaragaman, kekayaan, dominasi
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Pertika, Dinda, Syafruddin Nasution und Afrizal Tanjung. „COMMUNITY STRUCTURE OF GASTROPODS IN THE COASTAL WATERS OF NORTH RUPAT DISTRICT“. Asian Journal of Aquatic Sciences 5, Nr. 2 (05.08.2022): 215–27. http://dx.doi.org/10.31258/ajoas.5.2.215-227.
Annotation:
Community structure is a concept that studies the composition or composition of species and abundance in a community. Coastal waters are areas with a depth of less than 200 meters and there is a littoral area located between the highest tide and the lowest low tide or called the intertidal area. One of the community of organisms in this intertidal area is gastropods. This research was conducted from December 2021 to January 2022. The purpose of the study was to determine the structure of the gastropod community in the coastal waters of North Rupat District consisting of species, density, diversity index, uniformity index, dominance index, distribution pattern, and community similarity. As supporting data in this study, several environmental parameters were also measured which included water quality, sediment type and sediment organic matter content. The research method used is a survey method, where sampling using the quadrant transect method is carried out at 3 stations. Based on the results of the study found 14 species of gastropods. The species that were found in all stations were Indothais gradata. Gastropod density is 15.800 ind/ha. Diversity index value (H') 1.85, uniformity index (E) 0.70, dominance index (C) 0.24, distribution pattern (Id) 3.24 is clustered, species similarity index (Ss) between stations Tanjung Medang and Teluk Rhu 83% of species are almost the same and between stations Tanjung Medang and Tanjung Punak 15% and between stations Teluk Rhu and Tanjung Punak 17% are not the same. Water quality parameters as follows: temperature 27-28oC; salinity 30-31 ppt; pH 6-7. Sediment organic matter 0.50-2.28%, sand sediment type
40
Queiroga, Henrique, Rolando Costa, Nélia Leonardo, Débora Soares und Daniel F. R. Cleary. „Morphometric variation in two intertidal littorinid gastropods“. Contributions to Zoology 80, Nr. 3 (02.09.2011): 201–11. http://dx.doi.org/10.1163/18759866-08003004.
Annotation:
Here we investigate spatial variation in shell shape of Littorina saxatilis, an ovoviviparous species, and Melarhaphe neritoides, a species with planktonic eggs and larvae. Populations of both species were sampled in 6 sites located along the west coast of the Iberian Peninsula. Shell shape was studied using landmarkbased morphometric methods. Landmark data was used to estimate individual size and to describe shell shape. Prior to statistical analysis specimens were aligned using Generalised Procrustes Analysis (GPA). Ordinations based on GPA of landmark data and using Principal Components Analysis (PCA), revealed a clear spatial segregation of sites for both species, although this was more evident for L. saxatilis than M. neritoides. Statistical analysis revealed significant multivariate variation in shape among sites and a significant effect of allometry on shape for both species. In contrast to this last result, there was no significant linear relationship between any of the first three PC axes and size in L. saxatilis but highly significant associations between the first and third PC axes and size for M. neritoides. Spatial variation in the shape of both species was primarily related to variation in the height of the apical whorls and in the width of the aperture for L. saxatilis. Further variation in shape was related to the shape of the last whorl in L. saxatilis and shell elongation and a change in aperture shape in M. neritoides.
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Ramah, Sundy, Deepeeka Kaullysing und Ranjeet Bhagooli. „Marine mollusc (Mollusca: Gastropoda and Bivalvia) diversity of the Saya de Malha and Nazareth Banks, Mascarene Plateau“. Western Indian Ocean Journal of Marine Science, Nr. 2/2021 (20.07.2022): 121–27. http://dx.doi.org/10.4314/wiojms.si2021.2.9.
Annotation:
Marine molluscs are among the largest assemblages of the animal kingdom and inhabit the marine environment from the intertidal zone to the deep sea. This study reports the diversity of marine molluscs (Gastropoda and Bivalvia) collected from sediments at 19 stations (SS) at the Saya de Malha and Nazareth Banks during the EAFNansen expedition in May 2018. Sampling was carried out using the five hydraulic Van Veen grabs mounted on a Video-Assisted Multi-Sampler (VAMS). The mollusc shells were morphologically identified using established procedures and published guides. Shannon-Wiener diversity (H’) and Pielou’s evenness (J) indices were used to assess the diversity of the molluscs at each station. A total of 56 genera of marine gastropods belonging to 34 families, and 40 genera of bivalves from 16 families were recorded. The SS8 station at the Saya de Malha Bank had the highest diversity at a depth of 79 m for Gastropoda and Bivalvia, while SS1 harbored the highest overall molluscan diversity. At the Nazareth Bank, highest gastropod diversity was recorded at SS44, while SS43 had the highest bivalve and overall molluscan diversity. This study provides new information on the molluscan diversity at the Saya de Malha and Nazareth Banks.
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Firgonitha, Alinaung F., Anneke V. Lohoo und Alex D. Kambey. „Community Structure of Gastrpods in Mokupa Beach, Sub-district of Tobariri,Minahasa Regency, North Sulawesi Province“. JURNAL ILMIAH PLATAX 3, Nr. 1 (12.04.2015): 22. http://dx.doi.org/10.35800/jip.3.1.2015.13215.
Annotation:
Ecologically intertidal mollusk has important role in the food chains. As a filter feeder, mollusk is also known as a food source for other marine organisms. The intertidal zone is known as the smallest area in the ocean basin (Nybakken, 1992). This zone is a narrow edge cover only few square meters and position between low tide mark (LTM) and high tide mark (HTM). The study was conducted in Mokupa beach waters, Tombariri sub-district, Minahasa Regency. Coastal area of Mokupa village represent typical tropical ecosystem such as coral reef, seagrass bed and mangrove belt. As many as 45 species in 134 total individuals were recorded during the study. The density of gastropods collected is 4.4667 individual/m2 while density for gastropods species Littoraria scabra Linne was 0.4000 individual/m2 and in term of relative density is 9.834 % and thus considered the highest. Species diversity index of this species is H’ = 2.37594. Keywords: mollusk, diversity, dominance A B S T R A K Secara ekologis Moluska yang menempati daerah intertidal memiliki peranan yang besar kaitannya dengan rantai makanan. Karena di samping sebagai filter feeder, moluska juga merupakan makanan bagi biota lainnya. Zona intertidal (pasang-surut) merupakan daerah terkecil dari semua daerah yang terdapat di samudera dunia (Nybakken, 1992). Zona ini merupakan pinggiran yang sempit sekali, hanya beberapa meter luasnya, terletak di antara air pasang tinggi dan air surut rendah. Penelitian ini dilaksanakan di perairan pantai Mokupa Kecamatan Tombariri Kabupaten Minahasa. Daerah pantai Desa Mokupa merupakan daerah yang lokasinya terdapat ekosistem yang khas di daerah tropis yaitu terumbu karang, padang lamun, dan hutan mangrove. Diperoleh sebanyak 45 spesies dan berjumlah 134 individu. Kepadatan rata-rata organisme Gastropoda diperoleh 4,4667 indv/m2 , dengan kepadatan spesies tertinggi 0,4000 indv/m2 (Littoraria scabra Linne), dengan Kepadatan relative adalah 9,834 %.Keanekaragaman spesies diperoleh nilai (H’= 2.37594) Kata Kunci : Komunitas, keanekaragaman, dominasi 1Mahasiswa Program Studi MSP FPIK-UNSRAT 2Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi
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Alcaraz, Guillermina, und Karla Kruesi. „Niche overlap and resource partitioning between two intertidal hermit crab species“. Journal of the Marine Biological Association of the United Kingdom 99, Nr. 1 (07.12.2017): 135–42. http://dx.doi.org/10.1017/s0025315417001850.
Annotation:
The gastropod shell influences important aspects of the hermit crab's life; however, the shells are commonly a limited resource. Therefore, different hermit crab species that coexist in intertidal areas are commonly involved in intraspecific and interspecific competition for shells. We assess if differences in shell preference, exploitation ability, or competition by interference can explain the partitioning of shells between the coexisting species Calcinus californiensis and Clibanarius albidigitus. Clibanarius preferred shells of Nerita funiculata among the six gastropod shells tested, while Calcinus did not establish a hierarchy in shell preference. Therefore, the preference for gastropod shell species does not seem to diminish the competition for shells in the wild. Clibanarius identified and attended to chemical cues signalling potential sites of available shells (chemical cues of dead gastropods); Calcinus did not respond to these cues (competition by exploitation). However, Calcinus was more successful in obtaining a new shell by interspecific shell fighting than Clibanarius. Consequently, the use of better quality shells (intact shells) by Calcinus in the wild can be explained by its greater fighting ability compared with Clibanarius. The bias in shell distributions through dominance by shell fighting, more than by exploitation ability, has also been suggested for other hermit crab species of these genera.
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Lebedev, Evgeny B., Irina R. Levenets und Alexandra P. Tsurpalo. „First record of the rare sea snail Liostomia minutissima Golikov in Golikov et Scarlato, 1967 (Mollusca: Gastropoda: Pyramidellidae) from the intertidal zone of the Russian seas“. БЮЛЛЕТЕНЬ Дальневосточного малакологического общества 25, Nr. 1/2 (2021): 98–105. http://dx.doi.org/10.24866/1560-8425/2021-25/98-105.
Annotation:
A rare small-sized species of gastropod mollusk, the sea snail Liostomia minutissima Golikov in Golikov et Scarlato, 1967 (Pyramidellidae), was found in the intertidal zone off the Likander Peninsula, Popov Island, Peter the Great Bay (Sea of Japan) in 2019. This finding is the first record of the species for the intertidal fauna inhabiting the seas of Russia. Live individuals were collected from the rocky bottom in the middle horizon of the intertidal zone occupied by a community of the red algae Neorhodomela aculeata+Corallina pilulifera and other five species of small-sized gastropods. Shells of L. minutissima are grayish-white in color, shiny, from 1.55 to 1.7 mm in height. This finding was made among islands in the central part of Peter the Great Bay, where the bivalve mollusk Tellimya fujitaniana (Yokoyama, 1927), also new to the fauna of Russia, was previously discovered in the subtidal zone. The wide variety of available biotopes, active hydrodynamics, specific system of currents, and a moderate level of anthropogenic pressure are the major factors that make this area, along with the southwestern Peter the Great Bay, an interesting place where new malacological findings should be expected.
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Zabbey, Nenibarini, und Manuel António E. Malaquias. „Epifauna diversity and ecology on intertidal flats in the tropical Niger Delta, with remarks on the gastropod species Haminoea orbignyana“. Journal of the Marine Biological Association of the United Kingdom 93, Nr. 1 (19.10.2011): 249–57. http://dx.doi.org/10.1017/s0025315411001615.
Annotation:
Here we report novel data on the ecology and diversity of West African estuarine biological communities, with emphasis on the opisthobranch gastropod, Haminoea orbignyana. Macrofaunal samples were obtained from five intertidal flats within Bodo Creek in the lower Niger Delta during two years (May 2006–April 2008) to investigate diversity and community assemblages of epimacrofauna. A total of 601 individuals belonging to 18 species were recorded, with density varying between 4 ind.m−2 and 660 ind.m−2. Gastropods (predominantly Pachymelania aurita and H. orbignyana) accounted for 92.3% of the community abundance, followed by malacostraca crustaceans (7.7%). Diversity varied (P < 0.05) between locations, with the mangrove swamp station having higher richness, diversity and evenness values than the open intertidal flat locations. The species H. orbignyana was only found on downstream sampling sites reaching a maximum density of 52 ind.m−2. The species seems to recruit during November/December and likely attains a maximum life span of about 18 months.
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Arabaca, MLC, A. Ilano und VO Taunan. „Diversity Of Marine Macro Molluscan Gastropods and Bivalves In The Intertidal Areas Of Ajuy, Iloilo, Western Visayas, Philippines“. IOP Conference Series: Earth and Environmental Science 1118, Nr. 1 (01.12.2022): 012014. http://dx.doi.org/10.1088/1755-1315/1118/1/012014.
Annotation:
Abstract The Philippines has rich marine resources but are threatened by the effects of climate change and other activities made by humans. There is an inadequate or scarcity in literature on prominent impacts of climate change on the country’s rich biodiversity, specifically on marine ecosystem, thus this study aimed to determine the diversity of marine macro molluscan gastropods and bivalves on the intertidal areas of Ajuy, Iloilo, Western Visayas, Philippines. Marine macro gastropods and bivalves were surveyed monthly from October 2015 to March 2016 and transect method was carried out to assess species composition, abundance and occurrence. Shannon-Wiener index (H’) was utilized to determine the diversity of marine macro molluscan gastropods and bivalves in the area. Coefficient of correlation was used to determine correlation between physico-chemical properties of sea water with the diversity index value. There were a total of 8,705 individual mollusks sampled and classified up to 43 species of gastropods having 28 genera belonging to 20 families and 29 species of bivalves belonging to 22 genera out of 14 families. The family Muricidae was the best represented in species richness among the gastropods and family Veneridae among the bivalves. In family wise landing among the gastropods, the maximum number recorded was Batillariidae having a relative abundance of 46%. In bivalves, the most abundant family was Veneridae with 20.25% relative abundance. The Shannon-Wiener index value revealed that the area was still normal in terms of species diversity. Temperature and DO of sea water were positively correlated with the H’, whereas pH and salinity were negatively correlated. This study provided baseline information as to the status of marine macro molluscan gastropods and bivalves in the intertidal area of Ajuy, Iloilo, Western Visayas, Philippines.
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Donnarumma, Luigia, Roberto Sandulli, Luca Appolloni, José Sánchez-Lizaso und Giovanni Russo. „Assessment of Structural and Functional Diversity of Mollusc Assemblages within Vermetid Bioconstructions“. Diversity 10, Nr. 3 (28.08.2018): 96. http://dx.doi.org/10.3390/d10030096.
Annotation:
Dendropoma lebeche is a prosobranch gastropod belonging to the family Vermetidae, which calcifies its shell on hard substrates in dense aggregates, forming biogenic constructions along the western Mediterranean intertidal habitat. It is an important ecosystem engineer and, due to its ecological value, is protected by international convention. The aim of this study is to investigate the mollusc composition and diversity occurring within Spanish vermetid bioconstructions. During the late summer 2013, three distant sites along the Mediterranean coast of Spain were sampled by scraping off the vermetid shells to study their associated assemblages. A total of 600 molluscs were identified within the classes of Polyplacophora (four species), Gastropoda (35 spp.) and Bivalvia (18 spp.). Multivariate analyses revealed significant differences in composition and trophic diversity of mollusc assemblages among the three sites, highlighting a clear geographical gradient. Overall, both herbivores (grazers and deposit feeders) and omnivores were the quantitatively dominant trophic groups, while carnivores (predators and ectoparasites) were very scarce. Our results point out that mollusc assemblages associated with vermetid bioconstructions are rich and diversified, both in populations structure and trophic diversity, confirming the important role of vermetid gastropods as ecosystem engineers and biodiversity enhancers in shallow coastal waters.
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BARNETT, LEONIE J., LESLEY R. SMALES und THOMAS H. CRIBB. „A complex of putative acanthocolpid cercariae (Digenea) from Nassarius olivaceus and N. dorsatus (Gastropoda: Nassariidae) in Central Queensland, Australia“. Zootaxa 1705, Nr. 1 (18.02.2008): 21. http://dx.doi.org/10.11646/zootaxa.1705.1.2.
Annotation:
Cercariae capricornia I–VI, six new cercariae putatively identified as belonging to the Acanthocolpidae, are described and named from prosobranch gastropods of the family Nassariidae collected from the intertidal zone in the Capricornia region, Central Queensland, Australia. Four species are reported from Nassarius olivaceus and two from N. dorsatus. The cercariae have a unique and complex three-dimensional body shape, including a keel, which differentiates them from previously described acanthocolpid cercariae. These are the first cercariae to be described from these gastropods.
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Lestari, Linda, Karnan und Imam Bachtiar. „Population Structure of Turbo setosus and Strombus labiatus Collected By Rads in The Intertidal Area of Serinting Beach Special Economic Zone (SEZ) Mandalika“. Jurnal Biologi Tropis 23, Nr. 1 (02.11.2023): 90–95. http://dx.doi.org/10.29303/jbt.v23i1.5920.
Annotation:
Harvesting gastropods and other intertidal biota during lowest tides called Madak, is a traditional activity of coastal community on the Lombok Island. The Madak tradition has the potential to be used as a biology learning resource in schools. Variations in the size of Gastropods can be used as a source of studying population ecology. The present study aimed to describe quantitatively Gastropoda populations harvested during the madak. This study was carried out by collecting snail Turbo setosus and Strombus labiatus shells harvested in the intertidal area of Serinting Beach. Convenience sampling was applied to collect data from 5 people in 5 days. There were 120 individuals of T. setosus and 240 individuals of S. labiatus collected from 25 rads with varying shell sizes. The shell size of T. setosus ranges from 3.32 to 7.19 cm, which is then divided into 8 classes. The average size of the harvested shells was 5.08 cm with a standard deviation of 1.96 cm, which means that the distribution of the data obtained was less varied. The size of S. labiatus shells ranges from 2.40-4.78 cm which is then divided into 9 classes. The average size of harvested shells was 3.48cm with a standard deviation of 0.92 cm, which means that the distribution of the data obtained is less varied. The population structures of T. setosus and S. labiatus harvested were less diverse, so further research is needed to determine the population structure of T. setosus and S. labiatus found in nature.
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FEBIANSI, DEA, FERINTA RAHMAYANTI, FERINTA RAHMAYANTI, RIFA NINGMAS KURNIA, MALYA ADZILLINA SILMI, ARISMA KUSUMA DEWI, IRKHAMNA NOVIYANI KHUSNA MILLATY et al. „Species diversity of gastropods (Cypraeidae and Conidae) at Krakal Beach, Gunungkidul, Yogyakarta, Indonesia“. Indo Pacific Journal of Ocean Life 2, Nr. 1 (01.06.2018): 27–32. http://dx.doi.org/10.13057/oceanlife/o020104.
Annotation:
Abstract. Febiansi D, Rahmayanti F, Kurnia RN, Silmi MA, Dewi AK, Millaty NK, Prasetya TA, Roshitafandi DA, Sartika HW, Trijoko. 2018. Species diversity of gastropods (Cypraeidae and Conidae) at Krakal Beach, Gunungkidul, Yogyakarta, Indonesia. Ocean Life 2: 27-32. Krakal is a beach in Gunungkidul, Yogyakarta, Indonesia which has white sand and coral substrate in the intertidal zone. Cypraeidae and Conidae are families of gastropods found quite varied in the intertidal zone of Krakal Beach. The purpose of this research was to discover the diversity of Cypraeidae and Conidae families in the intertidal zone of Krakal Beach, Gunungkidul, Yogyakarta. The research was conducted on May 24, 2014 and May 25, 2017. The ecological parameters recorded were 26,5oC for temperature in 2014 and 26oC for temperature in 2017 , ±3.35% for salinity in 2014 and ±3,6% for salinity in 2017, 7.7 for pH. in 2014 and 7 for pH in 2017. The samples were collected using purposive sampling method, and specimens were identified by determining the morphological characteristics of the shell. This study found 5 species of Cypraeidae family in the intertidal zone of Krakal Beach, those are Cypraea annulus, Cypraea bouteti, Cypraea moneta, Cypraea caputserpentis and Cypraea lynx. While for family Conidae 5 species were found, those are Conus coronatus, Conus ebraeus, Conus capitaneus, Conus botulinus, and Conus fergusoni.