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Статті в журналах з теми "Intertidal gastropods":
1
Roring, Irawati RJC, Fransine B. Manginsela, and Boyke H. Toloh. "The Existence of Intertidal Gastropods in Malalayang Beach, North Sulawesi." JURNAL ILMIAH PLATAX 1, no. 3 (August 27, 2013): 132. http://dx.doi.org/10.35800/jip.1.3.2013.2571.
Анотація:
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
2
Bugaleng, Cornelis Dimas, Fransine B. Manginsela, and Alex D. Kambey. "In Intertidal Gastropod community Malalayang Beach Manado North Sulawesi." JURNAL ILMIAH PLATAX 3, no. 1 (April 12, 2015): 36. http://dx.doi.org/10.35800/jip.3.1.2015.13217.
Анотація:
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, and Jemi Ferizal. "KELIMPAHAN DAN KEANEKARAGAMAN GASTROPODA PADA ZONA INTERTIDAL DI PULAU BANGKA BAGIAN TIMUR." JURNAL ENGGANO 3, no. 1 (April 29, 2018): 10–21. http://dx.doi.org/10.31186/jenggano.3.1.10-21.
Анотація:
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, no. 1 (October 20, 2014): 8–12. http://dx.doi.org/10.30598/biopendixvol1issue1page8-12.
Анотація:
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, and SUET-MUN HO. "Gastropods in the Intertidal Shore of Kota Kinabalu, Sabah (Malaysian Borneo)." Borneo Journal of Resource Science and Technology 11, no. 1 (June 30, 2021): 9–23. http://dx.doi.org/10.33736/bjrst.3371.2021.
Анотація:
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, and Karnan. "Diversity of Gastropods and Bivalvia Caught By Pemadak in The Intertidal Zone of Serinting Beach, Special Economic Zone Mandalika." Jurnal Biologi Tropis 23, no. 1 (November 2, 2023): 81–89. http://dx.doi.org/10.29303/jbt.v23i4b.5921.
Анотація:
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, and Gaspar Manu. "Community Structure of Gastropod in Seagrass on Intertidal Area in The Tongkeina Village of Manado City." JURNAL ILMIAH PLATAX 1, no. 3 (August 19, 2013): 102. http://dx.doi.org/10.35800/jip.1.3.2013.2567.
Анотація:
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, and Alex D. Kambey. "Gastropod Density and Diversity in the Intertidal Zone of Malalayang Beach, Manado." JURNAL PERIKANAN DAN KELAUTAN TROPIS 10, no. 3 (January 20, 2020): 121. http://dx.doi.org/10.35800/jpkt.10.3.2019.27533.
Анотація:
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.
Анотація:
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, and Paresh Poriya. "Distribution Patterns of Key Gastropods (Mollusca) Species Along the Intertidal Zone of Adri Coast, Kathiawar Peninsula, India." Environment and Ecology 41, no. 4 (October 2023): 2266–73. http://dx.doi.org/10.60151/envec/whtv1322.
Анотація:
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.
Дисертації з теми "Intertidal gastropods":
1
Al-Mazrouai, Ahmed Mohammed. "Phenotypic plasticity in marine intertidal gastropods." Thesis, University of Plymouth, 2008. http://hdl.handle.net/10026.1/1973.
Анотація:
Phenotypic plasticity, the differential phenotypic expression of the same genotype in response to different environmental conditions, is a paradigm central of the study of evolution and ecology and is at the core of the "nature versus nurture" debate. Here, the marine gastropod Littorina littorea was used as a model to further our understanding of the potential role of phenotypic plasticity in intertidal systems. In the first study L. littorea was included in an investigation of induced defences across six species of intertidal marine gastropods in the families Littorinidae and Trochidae. Species differed in the magnitude and type of plastic response, which appeared to relate to their susceptibility to crab predation. Chapters three and four revealed that L. littorea was able to alter its degree of morphological plasticity depending on temporal variation in predation threat. Snails exposed to predation threat halfway through trials appeared to "catch up" snails continuously exposed to predator cues in, terms of their shell size, whereas snails experiencing a removal of predation cues showed a significant reduction in growth rate following this switch in predation environment. A further investigation suggested that Littorina littorea demonstrated no significant difference in the morphological traits under variable predator threat versus a constant predator' threat environment. Finally, the interaction between biotic (predator) and abiotic (temperature) environmental effects revealed that snails maintained at 16 and 20° C demonstrated significant induced defences by growing larger and thicker shells, but there was no significant difference in induced defences between these two temperatures. However, the expression of induced defences was much lower at 24° C with only negative significant response in two of shell traits IV between control and predator cue treatments which may indicate that induced defences was inhibited at this temperature treatment. The implications of these results are discussed as is the potential applications of induced defences.
2
Moisez, Emilie. "A step forward in the understanding of behavioural and thermal ecology of intertidal gastropods." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR010.
Анотація:
Les organismes intertidaux vivent dans un environnement variable et complexe et sont soumis à de nombreux stimulus et stress. Récemment, de nouvelles études sur les capacités sensorielles de ces gastéropodes et sur leur capacité à se déplacer dans leur environnement, ont démontrées que leur répertoire comportemental était plus large que prévu. Dans ce contexte, cette thèse a pour but d’améliorer nos connaissances sur le comportement de thigmotaxie chez Littorina littorea. La thigmotaxie a donc été testée dans des dispositifs expérimentaux de différentes tailles et de différentes formes. Cette approche permet aux individus de rencontrer des discontinuités en 2-dimension ou en 3-dimension et a pour but d’aider à comprendre comment la complexité topographique de leur environnement peut modifier le comportement thigmotactique chez les gastéropodes. La thigmotaxie a aussi été testée sous différentes conditions de salinité pour comprendre comment ces variations de salinité peuvent altérer leur comportement. En effet, les organismes intertidaux sont soumis à de larges variations de salinité pendant les périodes d’émersion. Pendant ces périodes d’émersion, ils sont aussi soumis à de grandes variations de température (jusqu’à 20°C). Ce travail s’intéresse aussi au comportement thermique des gastéropodes intertidaux via l’étude de la température du corps de L. littorea et de Patella vulgata et celle de leur microhabitat. Ces températures sont étudiées durant 4 jours ensoleillés, de Juin à Décembre, afin de tester le choix d’un microhabitat par ces 2 espèces de gastéropodes sous des conditions de températures auxquelles ils peuvent être soumis au cours d’un cycle saisonnier sur la Côte d’Opale. Le comportement d’agrégation chez L. littorea et les bénéfices thermiques associés précédemment étudiés dans la littérature sont aussi examinés, (i) in situ sous des conditions de vague de chaleur modérée et (ii) ex situ sous des conditions extrêmes de vague de chaleur simulée au laboratoire. En particulier, la température du corps des individus à l’intérieur et de ceux à l’extérieur des agrégats est étudiée pour comprendre l’importance de la position des individus au sein des agrégats.Ces résultats suggèrent que la thigmotaxie semble être l’une des taxies majeures impliquée dans l’orientation des gastéropodes. En effet, même sous des conditions défavorables (i.e. salinité basse), le comportement thigmotactique est observé chez L. littorea. Ce travail souligne également une préférence pour les macrohabitats biogéniques chez L. littorea et P. vulgata, qui permettent de réduire les stress thermique et de dessiccation. Au sein d’un macrohabitat, les organismes intertidaux sont capables de tirer avantage de la mosaïque thermique rencontrée dans leurs environnements et de sélectionner un microhabitat. Chez les gastéropodes, cette sélection de microhabitat est espèce-, température- et habitat-dépendante et leur permet de se maintenir dans leur optimum de températures. Pour finir, ce travail souligne l’absence de bénéfice thermique à être agrégé chez L. littorea sous des conditions de stress thermique. En particulier, sous des conditions de vague de chaleur extrême, la température du corps des individus à l’intérieur de l’agrégat est supérieure à celle des individus à l’extérieur de l’agrégat. Ce résultat pose la question, encore irrésolue, des mécanismes qui entrainent le comportement d’agrégation chez L. littorea.Ces résultats contribuent néanmoins à la preuve croissante qu’étudier le comportement chez les gastéropodes intertidaux est crucial pour comprendre comment ils se déplacent, perçoivent leur environnement et peuvent réagir à l’augmentation des températures dans le cadre du réchauffement global. Ce travail souligne également l’importance d’une meilleure compréhension de la thermorégulation chez les organismes intertidaux, pour permettre une meilleure estimation de l’impact du réchauffement global sur leur écologieIntertidal organisms inhabit highly variable and complex environments and are submitted to a large range of stimuli and stresses. Recently, new insights into the sensory abilities of intertidal gastropods and their subsequent ability to navigate through topographically complex landscapes demonstrated that the behavioural repertoire of intertidal gastropods is much wider than previously thought. In this context, the present thesis first aimed to ameliorate our knowledge in the thigmotactic behaviour of Littorina littorea. Specifically, thigmotactic behaviour was tested in experimental containers of different sizes and shapes. This approach allowed individuals to encounter two-dimensional and three-dimensional discontinuities in order to understand how the topographical complexity of their environment can modify this behaviour. Thigmotaxis was further tested under decreasing salinity concentrations to understand how salinity can modify gastropods behaviour, since they are typically submitted to large salinity variations during emersion periods. During emersion, intertidal organisms are also submitted to large temperature variations (up to 20°C). Thus, this work also investigated the thermal behaviour of intertidal gastropods by studying body temperature of L. littorea and Patella vulgata and their microhabitat temperature on a rocky platform on the French coasts of the eastern English Channel. Temperatures were investigated on four sunny days from June to December to test the microhabitat choice of these two intertidal gastropods species under temperature conditions typically experienced through a seasonal cycle on the Opal Coast. Aggregation behaviour in L. littorea and the associated thermal benefits previously found in gastropods literature were also investigated, (i) in situ under a moderate heat wave and (ii) ex situ under an extreme heat wave simulated under laboratory-controlled conditions. Specifically, the body temperature of individuals inside and at the edge of aggregates were investigated to assess the importance of the position within aggregates.Taken together, the results of this thesis suggest that the thigmotactic behaviour can be one of the major taxes involved in intertidal gastropods orientation. Indeed, even under unfavourable conditions (e.g. low salinity conditions), the thigmotactic behaviour is still observed in L. littorea. This work also highlighted macrohabitat preference in L. littorea and P. vulgata for biogenic structures which allow to reduce both desiccation and thermal stresses. Within a macrohabitat, intertidal organisms are able to take advantage of the thermal mosaic encountered in intertidal environment and select microhabitat. This microhabitat selection in gastropods, is species- temperature- and habitat-dependent and allows individuals to maintain their body into their optimal range of temperatures. Finally, this work stressed the absence of thermal benefits of being aggregated in L. littorea under heat stress conditions. Specifically, under extreme heat wave, body temperature of individuals inside the aggregate is higher than for individuals at the edge of the aggregate. This result raised the rather unexpected and still unresolved question to understand the mechanisms driving aggregation behaviour in L. littorea. These results nevertheless contribute to the growing evidence that studying behaviour in intertidal gastropods is critical to understand how they move, how they perceive their environment and how they cope with raising temperature under global warming. This work also highlighted the importance of a better understanding of the thermoregulatory behaviour in intertidal organisms, for a better estimation of the impact of global warming in their ecology
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Muteveri, Tinashe. "Effect of pleistocene climatic changes on the evolutionary history of South African intertidal gastropods." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/79791.
Анотація:
Thesis (PhD)--Stellenbosch University, 2013.ENGLISH ABSTRACT: Historical vicariant processes due to glaciations, resulting from the large-scale environmental changes during the Pleistocene (0.012-2.6 million years ago, Mya), have had significant impacts on the geographic distribution of species, especially also in marine systems. The motivation for this study was to provide novel information that would enhance ongoing efforts to understand the patterns of biodiversity on the South African coast and to infer the abiotic processes that played a role in shaping the evolution of taxa confined to this region. The principal objective of this study was to explore the effect of Pleistocene climate changes on South Africa′s marine biodiversity using five intertidal gastropods (comprising four rocky shore species Turbo sarmaticus, Oxystele sinensis, Oxystele tigrina, Oxystele variegata, and one sandy shore species Bullia rhodostoma) as indicator species. Sequence data obtained from partial segments of the mitochondrial cytochrome oxidase c subunit 1 (COI), and the nuclear ribosomal DNA (encompassing part of 5.8S, second Internal Transcribed Spacer and part of 28S, hereinafter called ITS2; or comprising part of the first Internal Transcribed Spacer, 5.8S, second Internal Transcribed Spacer and part of 28S, hereinafter called ITS), were used as genetic markers to construct phylogeographic patterns and to investigate demographic histories of the taxa. Population structure was investigated using haplotype network analyses, pairwise ΦST statistics, analysis of molecular variance (AMOVA), isolation by distance analyses, Bayesian analysis of population structure (BAPS) and coalescent analysis of gene flow. Demographic history was analysed through Fu′s Fs tests, mismatch distributions, and Bayesian skyline plots. Demographic analyses suggest that all five intertidal gastropods studied experienced demographic expansions dating to the late Pleistocene. The sandy shore direct developer B. rhodostoma began expansion after the LGM (c. 15 kya) whereas for the four rocky shore broadcast spawners (T. sarmaticus, O. sinensis, O. tigrina, and O. variegata) the onset of expansion coincided with or preceded the LGM (c. 25, 60, 50, 40 kya, respectively). Consistent with recent range expansions and gene flow patterns, the population genetic structure in all species was characterised by shallow or a lack of population differentiation. Oxystele variegata was an exception as it showed a deep disjunction, of late Pleistocene origin, between individuals in the west coast Namaqua Bioregion and those in the south coast Agulhas Bioregion. These results provide strong evidence of the vital role that Pleistocene climatic changes and current regimes played in shaping the nature and distribution of biodiversity on the South African coast. In addition, gene flow in all species, except O. tigrina, was remarkably asymmetrical with the regions around Cape Infanta and Port Elizabeth acting as source populations. Considering the generally weak population genetic structure and gene flow patterns detected for most gastropod species studied here, it is recommended that T. sarmaticus, O. sinensis, O. tigrina and B. rhodostoma be managed as panmictic populations, and that the region encompassing Cape Infanta, and Port Elizabeth should be prioritised for conservation as it appears to harbour source populations. Oxystele variegata was the only species showing distinct population structure and in this instance, species specific conservation efforts should recognize this divergence by treating the two genetic assemblages as distinct management units.
AFRIKAANSE OPSOMMING: Historiese vikariante prosesse kan toegeskryf word aan glasiasie, en het tot gevolg gehad dat grootskaalse veranderinge in die omgewing plaasgevind het tydens die Pleistoseen (,012 - 2.6 miljoen jaar gelede, Mjg). Dit het 'n beduidende impak gehad op die geografiese verspreiding van spesies, veral ook in die mariene stelsels. Die motivering vir hierdie studie was om nuwe data te voorsien wat sal bydrae tot die voortgesette pogings om die patrone van biodiversiteit langs die Suid-Afrikaanse kus te verstaan. Dit sou ook help om die abiotiese prosesse af te lei wat 'n rol gespeel het in die evolusie van taksa wat in hierdie streek voorkom. Die hoofdoel van hierdie studie was om die effek van die Pleistoseen klimaatsveranderinge op Suid-Afrika se mariene biodiversiteit te bepaal deur gebruik te maak van vyf intergety slak spesies as indikatore (vier wat in rotsagtige gebiede voorkom: Turbo sarmaticus, Oxystele sinensis, Oxystele tigrina, Oxystele variegata en 'n sanderige strand spesies: Bullia rhodostoma). Volgorde data verkry vanaf gedeeltelike segmente van die mitochondriale sitochroom oksidase c subeenheid 1 (COI), en die kern ribosomale DNA (bestaande uit 'n deel van 5.8S, tweede interne getranskribeerde spasieërders en 'n deel van 28S), hierna genoem ITS2 is gebruik as genetiese merkers om filogeografiese patrone te dokumenteer en ook om die demografiese geskiedenis van die spesies te ondersoek. Bevolking struktuur is ondersoek deur gebruik te maak van haplotipe netwerk analise, paarsgewyse ΦST statistiek, analise van molekulêre variansie (AMOVA), isolasie deur afstand analise, Bayesiaanse analise van die bevolking struktuur (BAPS) en analise van gene vloei. Demografiese geskiedenis is ontleed deur Fu se Fs toetse, misparing verdelings, en Bayesiaanse luglyn kurwes. Demografiese ontleding dui daarop dat al vyf die intergety slakke wat ondersoek is demografiese uitbreidings ervaar het wat terugdateer tot die einde van die Pleistoseen. Die sanderige strand direkte ontwikkelaar, B. rhodostoma, het die uitbreiding begin na die LGM (c. 15 Kya), terwyl vir die vier rotsagtige kusbewoners wat eiers oor 'n uitgebreide gebiede versprei (T. sarmaticus, O. sinensis, O. tigrina, en O. variegata) het die aanvang van die bevolkings uitbreiding saamgeval met die laaste galsiasie of dit voorafgegaan (c. 25, 60, 50, 40 Kya, onderskeidelik). In ooreenstemming met die onlangse reeks bevolkings uitbreidings, is die bevolking genetiese struktuur in alle spesies gekenmerk deur weinig differensiasie. Oxystele variegata was 'n uitsondering en het 'n ontwrigting van laat Pleistoceen oorsprong getoon tussen individue langs die weskus Namaqua Biostreek en dié in die suid kus Agulhas biostreek. Hierdie resultate voorsien sterk bewyse van die belangrike rol wat die Pleistoseen klimaatsveranderinge gespeel het in die vorming en verspreiding van biodiversiteit langs die Suid-Afrikaanse kus. Daarbenewens, geen vloei in alle spesies, behalwe O. tigrina, was merkwaardig asimmetries. Kaap Infanta en Port Elizabeth verteenwoordig moontlik die bron bevolkings. Met inagneming van die geringe bevolking genetiese struktuur en geenvloei patrone wat waargeneem is vir die meeste slak spesies wat bestudeer is, word dit aanbeveel dat T. sarmaticus, O. sinensis, O. tigrina en B. rhodostoma bestuur word as 'n panmiktiese bevolking, en dat die streek wat Kaap Infanta en Port Elizabeth insluit geprioritiseer moet word vir bewaring. Oxystele variegata was die enigste spesie wat duidelike bevolking struktuur getoon het en in hierdie geval, moet spesie spesifieke bewaringspogings aangewend word.
4
Waung, I.-Hui. "Effect of patch-size and habitat-edges on intertidal distributions of microgastropods." Thesis, The University of Sydney, 2006. https://hdl.handle.net/2123/28116.
Анотація:
With increasing human activity and urban development along coastal areas, much research has recently focussed on examining how fragmentation of habitats affect marine fauna in near-shore environments. This study examines relationships between density of populations and patch-size and the effect of edges of habitat on distributions of minute gastropods (microgastropods) living in patches of coralline algae on intertidal shores in south-eastem Australia.
5
Chin, I.-mei, and 錢綺微. "Variation in monodonta labio among different intertidal habitats in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244087.
6
in, John Kevin John. "The status and ecology of the intertidal gastropod littorina neglecta bean." Thesis, University of Leeds, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510013.
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Jones, Helen Lucy. "The reproductive and larval ecology of the intertidal nudibranch mollusc Adalaria proxima (Alder & Hancock) (Gastropoda: Opisthobranchia)." Thesis, University of St Andrews, 1996. http://hdl.handle.net/10023/14633.
Анотація:
This study concerns the reproductive and larval ecology of the nudibranch Adalaria proxima. Attainment of competence is demonstrated to be cue specific. Embryos metamorphose in response to choline, yet remain precompetent to elevated potassium and the natural cue until after hatching. It is hypothesized that the choline-mediated metamorphic pathway (or choline-sensitive portion of the natural pathway) becomes functionally complete ontogenetically earlier than do larval chemoreceptors. Larvae metamorphose in response to sea water 'conditioned' (CSW) by the bryozoan Electra pilosa. A range of littoral organisms failed to induce metamorphosis and it is suggested that A. proxima displays a high degree of cue specificy. It is reported that CSW-mediated metamorphosis is dose dependent and effected in a disparate manner to that of potassium. No evidence for a bacterial role in metamorphosis was found. These results are intended to facilitate future isolation of the natural cue. Both starved (lecithotrophic) and fed (facultatively planktotrophic) larvae may successfully delay metamorphosis for 28-31d post-hatching (at 10-C). Larval fitness appeared to be unaffected by nutritional status, which is suggested to reflect the transitional evolutionary nature of facultative planktotrophy. The lowered fitness commensurate with an extended pelagic period is hypothesized to confer a lowered dispersal potential. A. proximais semelparous, producing up to eleven spawn before dying. Significant variation in reproductive traits is demonstrated within and between six U.K. populations of A. proxima Intrapopulation decreases in egg size, fecundity and hatching success with spawn laying sequence are suggested to reflect phylogenetic constraints. Interpopulation differences in egg size and fecundity are considered consistent with the predicted limited larval dispersal potential. Population egg size was correlated to larval size but not latitude or fecundity. Possible causative factors of the observed interpopulation variation in reproductive traits are discussed, and most probable causes hypothesized.
8
Cooper, Erin Elaine 1981. "Population biology and reproductive ecology of Chlorostoma (Tegula) funebralis, an intertidal gastropod." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10916.
Анотація:
xv, 99 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.The trochid gastropod Chlorostoma (Tegula) funebralis is found in rocky intertidal habitats along the west coast of North America from Baja California to Vancouver Island. Size-frequency distributions of populations were analyzed along a latitudinal gradient from northern Oregon to Baja California. Populations in California and southern Oregon were dominated by individuals in the juvenile size classes (0.1g-2g). Along the Oregon coast, populations dominated by juveniles were correlated with coastline topography, with protected areas having large numbers of juveniles and exposed areas dominated by larger size classes. The largest size classes (>9g) were rarely present in southern populations. The seasonality of reproduction was investigated in a southern California population and an Oregon population to determine whether continuous reproduction in southern populations increases recruitment success over the year and decreases inter-annual variation in reproductive success. Constant recruitment may cause populations to have a large number of juveniles, the observed pattern in southern populations. Although individuals capable of reproduction were found year-round in both populations, the southern population experienced multiple spawning events over the year, while the northern population experienced only one such event. Constant recruitment may be a strategy to compensate for shorter life spans and smaller sizes of individuals in southern California. To investigate whether variations in predation rates on large adult C. funebralis affect the size structure of populations, the main predators and predation rates for different populations in Oregon were identified. All observed predation events were by the intertidal seastar Pisaster ochraceus . Predation pressure by P. ochraceus varied significantly with site and between sampling dates but did not remove enough C. funebralis from the adult population to have a significant effect on population size structure. To determine the connectivity between populations and the maximum dispersal potential, the mitochondrial gene COI was sequenced from individuals from nine populations ranging from southern California to northern Oregon. Although haplotype diversity was high, no genetic structure was found between populations. Rather than an indication of high dispersal potential and a panmictic species, the lack of isolation by distance may be a result of range expansion following the last glacial maximum.
Committee in charge: Patrick Phillips, Chairperson, Biology; Alan Shanks, Advisor, Biology; Craig Young, Member, Biology; Richard Emlet, Member, Biology; Jon Erlandson, Member, Anthropology; Gregory Retallack, Outside Member, Geological Sciences
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McNeill, Myndee. "Predation Avoidance Response Behaviors, Oviposition and Distribution of the Intertidal Gastropod Lirularia succincta." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11491.
Анотація:
xiii, 141 p. : ill. (some col.)The small trochid gastropod
Committee in charge: Dr. Craig M. Young, Chair; Dr. Richard B. Emlet, Member; Dr. Alan L. Shanks, Member
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Roman-Pena, Rodrigo R. "Does Bioregionalisation Really Reflect Differences in Biodiversity? A Test of the Marine Bioregional Boundaries of Australia Using Gastropod Assemblages." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17224.
Анотація:
The management of Australian coastal marine biodiversity is geographically delineated by bioregions defined under the Interim Marine and Coastal Regionalisation of Australia system (IMCRA). The location of boundaries between adjacent IMCRA defined bioregions is based on biotic and abiotic surrogates. Intertidal habitats are not well represented in the IMCRA model, so it is not known whether conservation plans based on IMCRA identified bioregions will effectively represent distinct communities for conservation. Here, I used gastropod molluscs as a model fauna because they are a significant component of intertidal assemblages. The model tested was that patterns of biodiversity exhibited by gastropods should align with IMCRA boundaries. Gastropods have been shown to be a reliable surrogate to assess patterns of biodiversity at larger scales. Tests were performed at different spatial scales under three different and complementary approaches, as surrogates can be effective under varying circumstances. At a continental scale, gastropods exhibited patterns of distribution coinciding with previous classic biogeographical models rather than IMCRA defined bioregions. At a scale of 103 km, gastropod assemblages did not coincide with boundaries set by IMCRA. The genetic structure of the microgastropod Eatoniella atropurpurea, a hyper-abundant species, again did not match bioregional boundaries. Thus, the general model that different bioregions support different assemblages was not supported in my study as the variability found at different spatial scales did not correlate with IMCRA defined boundaries The implications of these results are that different methods of conservation management at b large and fine scale are necessary for the design of marine reserves, as the current model (IMCRA) does not represent patterns of biodiversity at finer scale. New conservation tools must incorporate the natural variability in assemblage structure that occurs at finer scales.
Книги з теми "Intertidal gastropods":
1
Thut, Peter Benjamin. Quantifying the effects of evaporative cooling in two species of intertidal gastropods. 1997.
2
Leslie, Samuel B. Desiccation tolerance and resistance of Nucella emarginata and Nucella lamellosa in relation to their intertidal distribution. 1989.
Частини книг з теми "Intertidal gastropods":
1
Chelazzi, Guido, Stefano Focardi, and Jean-Louis Deneubourg. "Analysis of Movement Patterns and Orientation Mechanisms in Intertidal Chitons and Gastropods." In Behavioral Adaptation to Intertidal Life, 173–84. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-3737-7_13.
2
West, Lani. "Interindividual Variation in Foraging Behaviour within a Temperate and a Tropical Species of Carnivorous Gastropods." In Behavioral Adaptation to Intertidal Life, 197–212. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-3737-7_15.
3
Mohamad Basir, Noor Hamizah, Nursalwa Baharuddin, and Amirrudin Ahmad. "Impact of Tropical Storm Pabuk on Intertidal Gastropods in Bidong Island, Malaysia." In Bidong Island, 119–28. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91924-5_10.
4
McMahon, Robert F., W. D. Russell-Hunter, and David W. Aldridge. "Lack of metabolic temperature compensation in the intertidal gastropods, Littorina saxatilis (Olivi) and L. obtusata (L.)." In Advances in Littorinid Biology, 89–100. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0435-7_9.
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McQuaid, Christopher D., and P. A. Scherman. "Thermal Stress in a High Shore Intertidal Environment: Morphological and Behavioural Adaptations of the Gastropod Littorina africana." In Behavioral Adaptation to Intertidal Life, 213–24. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-3737-7_16.
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Olabarria, C., J. M. Timmermans, and T. Backeljau. "Electrophoretic heterogeneity within and between flat periwinkles (Mollusca: Gastropoda) along an intertidal transect at Ria Ferrol, northwest Spain." In Aspects of Littorinid Biology, 11–19. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5336-2_2.
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Lang, R. C., J. C. Britton, and T. Metz. "What to do when there is nothing to do: the ecology of Jamaican intertidal Littorinidae (Gastropoda: Prosobranchia) in repose." In Aspects of Littorinid Biology, 161–85. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5336-2_19.
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T. Lumeran, Belen. "Assemblage of Gastropods in the Rocky Intertidal Zone of Asry Beach, Kingdom of Bahrain." In Invertebrates - Ecophysiology and Management. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.87772.
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Underwood, A. J. "Competition and marine plant-animal interactions." In Plant-Animal Interactions in the Marine Benthos, 443–76. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198577546.003.0020.
Анотація:
Abstract Competitive interactions for food are widespread amongst marine invertebrate grazers. The common occurrence of such interactions is due to the unpredictable increases in density of grazers that can occur as a result of large fluctuations in the timing and intensity of settlement or recruitment from planktonic stages. In addition, the supplies of algal foods, particularly microalgae that are consumed by many intertidal grazing gastropods, are also variable. Thus, a superfluity of grazers, or shortage of resource, may happen in any area without regard to any previous abundances of the food or its consumers. Despite the widespread nature of competitive interactions for food, general synthesis is not yet possible about many aspects of this process. These include the nature of symmetry or asymmetry of competition, particularly where grazers have different modes of feeding. It is not yet clear whether competition will necessarily lead to local exclusion of species from patches of a habitat. These areas of uncertainty are discussed with respect to suitable designs of experimental analyses of this widespread process in benthic systems.
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Vadas, Robert L., and Sr Robert W. Elner. "Plant-animal interactions in the north-west Atlantic." In Plant-Animal Interactions in the Marine Benthos, 33–60. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198577546.003.0002.
Анотація:
Abstract A feature of the north-west Atlantic is low macroalgal diversity, which may be related in part to grazing. The major herbivores, the sea urchin Strongylocentrotus droebachiensis and the gastropod Littorina littorea, affect distribution and abundance patterns of macroalgae, especially annual forms. Persistent subtidal and intertidal algae are mainly perennials and defended species. Grazing by herbivores appears to influence but not control algal recruitment. Temporal and spatial refuges provide variability for algal colonization. Algae serve as habitat and food for a variety of subtidal and intertidal animals, including crustaceans. Most algal production appears to pass into detrital rather than into herbivore food webs. The systems and interactions are influenced by historical and stochastic events. The introduction of L. littorea in the early nineteenth century displaced Nassarius obsoletus and probably catalysed large-scale changes in the intertidal. Population explosions, followed by massive mortalities of urchins off Nova Scotia, have resulted in an alternation between subtidal macroalgal beds and coralline algal-dominated barrens. Dense populations of littorinids and dogwhelks recycle patches of free space in the intertidal by removing ephemeral algae and barnacles. Feeding by L. littorea on drift algae may have indirectly led S. droebachiensis to increase grazing pressure on living plants. Although much remains unknown about the roles of recruitment, abiotic disturbance and stress, and episodic events, herbivores clearly have a significant impact on benthic algal assemblages.
Тези доповідей конференцій з теми "Intertidal gastropods":
1
"Biodiversity of Gastropods in Intertidal Zone of Krakal Beach, Gunungkidul, Yogyakarta." In 1st Bioinformatics and Biodiversity Conference. Galaxy Science, 2021. http://dx.doi.org/10.11594/nstp.2021.0703.
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Parker, Wesley G., Yurena Yanes, Donna Surge, and Eduardo Mesa. "CALIBRATING THE OXYGEN STABLE ISOTOPES OF THE ROCKY INTERTIDAL GASTROPODS PATELLA CRENATA AND PHORCUS (OSILINUS) ATRATUS FROM THE CANARY ISLANDS AS PALEOCLIMATIC PROXIES." In Joint 52nd Northeastern Annual Section and 51st North-Central Annual GSA Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017ne-289808.