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1
Zhang, Zhongfang, Shanshan Xia, Xuetao Sun, and Lizhi Zhou. "Effects of Macrobenthos Relative to Floating-Leaved Plants on the Wintering Shorebird Assemblages at Shengjin Lake, China." Diversity 14, no. 12 (December 5, 2022): 1072. http://dx.doi.org/10.3390/d14121072.
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In shallow lakes, floating-leaved plants can produce dense lakebeds that dramatically alter freshwater ecosystems and impact macrobenthic communities. Shorebirds are morphologically diverse and utilize different foraging strategies; they can partition food resources to achieve coexistence due to differences in food availability. In this study, we defined shorebird foraging guilds using a principal component analysis and explained differences in shorebird composition in terms of food availability by comparing macrobenthic and shorebird communities in Euryale ferox artificial planting areas, Trapa spp. natural growth areas, and control areas. The Mantel test and a Spearman analysis were used to correlate macrobenthic taxa with shorebird foraging guilds. We recorded four different macrobenthic taxa in the three study areas, including insects, gastropods, oligochaetes, and bivalves. Fifteen species belonging to three shorebird families were recorded across the three study areas. Our results suggest that floating-leaved plants are an important cause of differences in macrobenthic communities, and epifaunal macrobenthos (insects and gastropods) and infaunal macrobenthos (oligochaetes and bivalves) take on different patterns of diversity composition in different habitats. The macrobenthic and shorebird communities were potentially coherent. Different shorebird foraging guilds were limited by food availability and thus correlated differently with different macrobenthos. Therefore, differences in macrobenthic communities relative to floating-leaved plants can affect shorebird assemblages by affecting the availability of food resources.
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Selleslagh, Jonathan, Sandric Lesourd, and Rachid Amara. "Comparison of macrobenthic assemblages of three fish estuarine nurseries and their importance as foraging grounds." Journal of the Marine Biological Association of the United Kingdom 92, no. 1 (April 7, 2011): 85–97. http://dx.doi.org/10.1017/s0025315411000336.
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Macrobenthic assemblages were examined in three fish estuarine nurseries and related to environmental variables, as well as fish and macrocrustaceans, in order to assess and compare the potential foraging ground value of these systems. Macrobenthos was sampled in spring 2007 in the Canche, Authie and Somme estuaries (eastern English Channel, France). A total of 17, 28 and 23 macrobenthic taxa, with a clear dominance of amphipods (mainly Bathyporeia sarsi), polychaetes and bivalves, were recorded in the three estuaries respectively. Although predators (fish and macrocrustaceans) were abundant, relatively high densities of macrobenthos were observed: 876.2 ± 389.1, 595.4 ± 197.2 and 854.3 ± 281.2 ind. m-2 in the Canche, Authie and Somme, respectively. No significant difference in species richness, Shannon–Wiener diversity and density (total and dominant groups) of macrobenthos was observed between the three estuaries. Although the analysis of similarity and similarity percentages analyses indicated that macrobenthic assemblage was variable between Authie and Somme, results showed that macrobenthos resource was relatively high and similar in the three estuaries. Taking into account these considerations, the present study indicated a similar relative importance of the Canche, Authie and Somme estuaries as foraging grounds for fish and macrocrustaceans during spring. Multivariate analysis showed that macrobenthic assemblages were mainly driven by salinity and sediment characteristics in the Canche and Authie estuaries while in the Somme estuary sediment characteristics were the most influencing parameters.
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Haque, Md Mozammal, Abu Sayed Muhammad Sharif, Md Kawser Ahmed, Ferdows Anwar, Seema Rani, Md Habibur Rahman Molla, and Makidul Islam Khan. "Distribution and Diversity of Macrobenthos in Sangu River, Bangladesh." Dhaka University Journal of Earth and Environmental Sciences 9, no. 2 (August 10, 2021): 27–34. http://dx.doi.org/10.3329/dujees.v9i2.55087.
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This study was conducted to understand the macrobenthos distribution and abundance in Sangu River to monitor the aquatic pollution level. Both surface and sub-surface water and benthic sediments were collected from three stations of the Sangu River. A few indices viz. Shannon-wiener, Simpson, Margalef’s and Evenness were used to estimate the macrobenthic assemblages. In this study, a total of 11 major taxa comprising total 870 macobenthic species were identified. Shannon-wiener index was maximum (1.58) at lower part (LP) which indicated moderate to heavily pollute aquatic environment of the Sangu River. The average diversity values of Shannon, Evenness, Simpson and Margalef’s indices were 0.97, 0.43, 0.39 and 1.54 respectively. The concentration of dissolved oxygen was the lowest (4.90 mg/L) at LP and the highest (5.08 mg/L) at upper part (UP). This study showed that macrobenthos abundances was influenced by higher temperature, salinity, and pH. The percentage of organic carbon content was maximum (98.18%) at LP where the macrobenthic abundance was 330 individuals/m2, whereas it was minimum (80.77%) at UP where macrobenthic abundance was 248 individuals/m2 that indicated carbon content also influence the assemblages of the macrobenthos in the Sangu River. A clear gradient of physico-chemical and benthic soil parameters fluctuation was also found to be responsible for the variations of macrobenthos assemblage in the Sangu River. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 9(2), 2020, P 27-34
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Pan, Sin-He, Chuan-Wen Ho, Chiao-Wen Lin, Shou-Chung Huang, and Hsing-Juh Lin. "Differential Response of Macrobenthic Abundance and Community Composition to Mangrove Vegetation." Forests 12, no. 10 (October 14, 2021): 1403. http://dx.doi.org/10.3390/f12101403.
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The mass planting of mangroves has been proposed as a mitigation strategy to compensate for mangrove loss. However, the effects of mangrove vegetation on the abundance and community composition of macrobenthos remain controversial. The macrobenthic communities in four intact mangrove forests with different conditions and the adjacent nonvegetated mudflats of two mangrove species with distinct stand structures on the western coast of Taiwan were examined. Some macrobenthic taxa occurred only in the mangroves, suggesting macrobenthic critical habitats. Seasonal shift in community composition was more pronounced in the mudflats than in the mangroves, possibly due to the rich food supply, low temperature, and shelter function provided by mangrove forests. However, crab density was always lower in the mangroves than in the mudflats. There was a negative relationship between the stem density of Kandelia obovata (S., L.) and infaunal density. The pneumatophore density of Avicennia marina (Forsk.) correlated negatively with epifaunal density. Our results show that the response of macrobenthic abundance and community composition to mangrove vegetation was inconsistent. We reason that mangroves are critical habitats for the macrobenthos in the mudflats. However, if mangrove tree density is high, we predict that the macrobenthic density will decrease. This suggests that at some intermediate level of mangrove tree density, where there are enough mangrove trees to harbor a macrobenthic community but not enough trees to significantly reduce this density, mangroves management can be optimally achieved to promote the presence of a diverse and dense macrobenthic community.
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Shafie, B. B., A. Man, N. F. Ali, and A. A. Rahim. "Macrobenthos diversity along the Exclusive Economic Zone of East Coast Peninsular Malaysia." Journal of Environmental Biology 42, no. 3(SI) (May 31, 2021): 817–23. http://dx.doi.org/10.22438/jeb/42/3(si)/jeb-13.
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Aim: To examine the standing stock of macrobenthos along a depth gradient at regional scales in the Sunda Shelf of Malaysian Economic Exclusive Zone (EEZ). Methodology: Macrobenthos was sampled with a Smith–McIntyre grab at 19 stations on the continental shelf of the South-western South China Sea (east coast of Peninsular Malaysia) within the EEZ and was carried out onboard MV SEAFDEC II in May/June 2016. Results: The faunal composition, abundance, and diversity of species, together with environmental parameters were studied. A total of 10,232 individuals comprising 105 families were identified. The dominant macrobenthic group was Mollusca (55.25%), followed by Annelida (26.80%) and Arthropoda (15.36%), while the Echinodermata and Miscellaneous group recorded 1.13% and 1.43% respectively. Based on Bray-Curtis species similarities, five different sample groups (SGs) were distinguished, which were located in different zones and gradients of EEZ. Interpretation: Variations in the macrobenthic community is significantly associated with depth, temperature, and salinity. Further research should be conducted on other factors that contribute to the diversity of macrobenthos along the east coast of Peninsular Malaysia’s EEZ.
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Farabi, Seyyed Mohammad Vahid, Abolghasem Roohi, and Abdolhamid Azari. "Comparative study of the impacts of fish cage culture on some environmental factors and Macrobenthic communities in offshore farms in the southern Caspian Sea." Journal of Aquaculture & Marine Biology 12, no. 1 (2023): 1–6. http://dx.doi.org/10.15406/jamb.2023.12.00350.
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The aim of this study was to investigate the effects of fish cage culture on Macrobenthic in the southern Caspian Sea. Samples were collected in two offshore farms with four floating polyethylene cages with a production of 60 tons for 5 months in 2015. Sampling was performed of macrobenthos, physicochemical, and sediment in January, March, May, and August at the depths of shade, 50, 100, and 1000 m in three geographical directions (east, west, and south) of the farm. Macrobenthic analysis showed Hypaniola kowalewskii and Streblospio gynobranchiata were predominant, which resulted in an unusual condition due to the effectiveness of the marine farm. There was a linear relationship between environmental factors and macrobenthos communities under the RDA analysis test and the water temperature was the most crucial factor in the density of the dominant species in both fish farm sites. The dominant Macrobenthic species were subjected to environmental conditions in addition to the influence of temperature, salinity, pH, dissolved oxygen, nitrogen, and phosphorus compounds. This situation can be attributed to the hydrological conditions of the studied area; low production of fish, a short period of fish farming, suitable depth of cages established and different water flow directions.
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Xiong, Shao Gao, Hong Yuan Li, and Xiu Ming Wang. "Relationships between Macrobenthos and Environmental Variables in Tianjin Offshore Water." Advanced Materials Research 838-841 (November 2013): 2556–60. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2556.
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With rapid economic and social development in Tianjin coastal area, environmental impact factors are increasingly complex. In order to study the relationships between macrobenthos and environmental variables, macrobenthos and seven environmental variables (including dissolved oxygen, active phosphate, inorganic nitrogen, ammonia, nitrate, nitrite, and oil) are investigated in the summer of 2004 and 2007. Canonical Correspondence Analysis (CCA) and Redundancy Analysis (RDA) in CANOCO software are all employed in the analysis for mutual authentication of the result. The results indicate that: (1) reactive phosphate and nitrite are the most important impact factor for the macrobenthic community; (2) nitrate is the supplementary factor that explains the macrobenthos data; (3) whether inorganic nitrogen is a key impact factor, it needs further research.
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Kim, Sang Lyeol, Su Min Kang, Hyung-Gon Lee, Gwan Hee Han, and Ok Hwan Yu. "Species Diversity and Community Structure of Macrobenthos in the Ulleung Basin, East Sea, Republic of Korea." Journal of Marine Science and Engineering 11, no. 1 (January 3, 2023): 92. http://dx.doi.org/10.3390/jmse11010092.
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The Ulleung Basin of the East Sea is a biological hotspot, but studies on the macrobenthos therein are lacking. To evaluate the macrobenthos species diversity and community structure in the Ulleung Basin, we conducted a survey from 2017 to 2021. A total of 262 species of macrobenthos was detected by the survey, and the average habitat density was 243 individuals/m2. The average biomass of macrobenthos was 43.7 g/m2, and the average Shannon and Wiener’s diversity index was 2.3 (0.69–3.61). The dominant species were the polychaetes Terebellides horikoshii, Chaetozone setosa, Scalibregma inflatum, and Aglaophamus sp. and the bivalvia Axinopsida subquadrata. The community structure of macrobenthos differed according to water depth, and a correlation analysis using environmental variables showed that the community was affected by water temperature, salinity, and dissolved oxygen. The macrobenthic fauna in the Ulleung Basin was greatly influenced by water depth, the sedimentary environment was different, and the dominant species were also different. In addition, there was little seasonal change compared to the East Sea coast. Our findings will facilitate further investigation of benthic ecosystems throughout the East Sea.
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Vineetha S. "The Benthic Macrofaunal Community in Agricultural Ditches in Kole Paddy Fields, Vembanad Kole Wetlands, India." Journal of Advance Research in Business Management and Accounting (ISSN: 2456-3544) 2, no. 11 (November 30, 2016): 01–08. http://dx.doi.org/10.53555/nnbma.v2i11.492.
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Paddy fields are connected by drainage ditches (channels),that are considered as drivers of biodiversity inagricultural areas. The macrobenthic community structure in agricultural ditches of Kole paddy fields, a part ofthe Ramsar site Vembanad kole wetlands during a complete crop season was analyzed. The macrobenthicfauna belonged to phyla Annelida, Arthropoda and Mollusca and classes Oligochaeta (60.39%), Insecta(39.31%), Mollusca (0.15%) and Hirudinae (0.15%). The class Oligochaeta was represented by Tubificidae,Naididae, Lumbriculidae; Insecta by Diptera, Coleoptera, Odonata; Mollusca by Bivalvia, Gastropoda.Composition of macrobenthos resembled to that of fresh water wetlands and paddy fields. The average numberof macrobenthos was 1475±2064 ind./m2. There was an unusually high abundance in May (5155 ind./m2); butthe environmental parameters remained usual. The abundance of good quality food or some specific, localizedcondition acting on a microscale which could not be recorded in the environmental analysis would haveresulted in the unusual distribution of the fauna. Highest diversity (3.17) and species richness (1.95) wasobserved during May 2011, during the unusual abundance. Predominant functional feeding group wascollector gatherers indicating the abundance of fine organic particulate matter (FPOM) in the substrate. Nosignificant correlation emerged between macrobenthic abundance and environmental parameters.
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Kim, Sang Lyeol, Hyung Gon Lee, Su Min Kang, and Ok Hwan Yu. "The Influence of Manila Clam (Ruditapes philippinarum) on Macrobenthos Communities in a Korean Tidal Ecosystem." Sustainability 12, no. 10 (May 20, 2020): 4205. http://dx.doi.org/10.3390/su12104205.
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We investigated the biological impact of extensive Manila clam (Ruditapes philippinarum) aquaculture on macrobenthic communities in a tidal ecosystem in Korea. We collected macrobenthos (>1 mm in length) samples seasonally in the intertidal zone in Geunsoman, Taean, Korea from April 2011 to December 2014. We identified 146 macrobenthos species, including 60 polychaetes, 53 crustaceans, and 16 mollusks. A biota–environment matching (BIO–ENV) analysis indicated that the benthic community was affected by mean sediment grain size (Mz), total organic carbon (TOC), and R. philippinarum biomass. We found no correlation between R. philippinarum and the main dominant species (Heteromastus filiformis, Ceratonereis erythraeensis, and Ampharete arctica), which have a different feeding strategy; thus, this may result in a lack of competition for food resources. In addition, we found that flourishing R. philippinarum positively affects the macrobenthos density but negatively affects the biodiversity index. Moreover, competition between species does not occur clearly, and environmental variables (sediment, organic carbon) are important.
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Mahapatro, Debasish, R. C. Panigrahy, Sudarsan Panda, and Rajani K. Mishra. "Influence of Monsoon on Macrobenthic Assemblage in Outer Channel Area of Chilika Lagoon, East Coast of India." Journal of Wetlands Ecology 3 (February 1, 2010): 57–68. http://dx.doi.org/10.3126/jowe.v3i0.2223.
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Abundance of macrobenthos in the outer channel area of Chilika lagoon in the east coast of India was studied during Monsoon season of 2007 & 2008. In total 27 species of macrobenthic organisms were collected during the study period season. Crustacea was emerged as the most dominate group representing 9 species followed by polychaetes with 8 species while 5 species belonged to bivalvia and 3 species to gastropoda. The others group in the study area included nematodes and echiurids. The mean density of macrobenthos was 378 organism m-2 and 392 organism m-2 in 2007 & 2008.The biomass was measured as and biomass 0.525 g m-2 and 0.575 g m-2 during 2008 &2007. Mean values of diversity indices like Margalef's richness index was 2.7 in 2007 and 3.0 in 2008. While Shannon's H' was 1.7 of 2008 and 1.8 in 2007. The Evenness J was calculated as 0.76 in 2008 and 0.94 in 2007. The result of the study shows that hydrographical parameters like Temperature (°C), pH and Salinity (psu) parameters had modest relationship with population density and biomass. The preference of macrobenthic organism to any specific parameter couldn't be established clearly and this would be due to the presence of more opportunistic filters feeders than the deposit feeders. The opening of a new outlet connecting with the sea had good influence on species richness and population density. Key words: Chilika lagoon; Macrobenthos; Population density; biomass; diversity indices DOI: 10.3126/jowe.v3i0.2223 Journal of Wetlands Ecology, (2009) Vol. 3, pp 56-67
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Musale, Amar S., Dattesh V. Desai, S. S. Sawant, K. Venkat, and A. C. Anil. "Distribution and abundance of benthic macroorganisms in and around Visakhapatnam Harbour on the east coast of India." Journal of the Marine Biological Association of the United Kingdom 95, no. 2 (November 24, 2014): 215–31. http://dx.doi.org/10.1017/s0025315414001490.
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Benthic communities form an important component of the marine food chain. Their occurrence also provides information on the health of the ecosystem. A study was carried out to understand the distribution and abundance of macrobenthos along with sediment characteristics and physicochemical parameters in Visakhapatnam Harbour, a major port along the east coast of India. In all 84 macrobenthic taxa were reported from the port area of which 60 were polychaetes and 24 were other invertebrate taxa. Our observations revealed an increase in the number of polychaete species observed over the last 20 years from this region. An earlier study reported 38 polychaete species in 1975 and a year later the number of polychaete species reported was 12, indicating an increase in the number of polychaete species in the present study by about 150%. The macrobenthic abundance and dominance of species varied with the seasons. Pre-monsoon was dominated by Cirratulus sp., during monsoon tanaids were dominant indicating a seasonal shift in the occurrence and dominance of macrobenthos. During post-monsoon, Cossura coasta was dominant followed by Nephtys dibranchis and amphipods. Sediment characteristics (sand, silt and clay), organic carbon and dissolved oxygen were the important factors influencing the abundance and species diversity. The abundance of macrobenthic forms also varied with inner and outer harbour region. Higher species diversity was observed in the outer harbour suggesting the outer harbour has semi-polluted conditions such as higher dissolved oxygen (DO) and salinity, low nutrients (nitrite, nitrate and silicate) and low organic carbon in the sediment.
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Bertrán, Carlos, Pablo Fierro, Elizabeth Encalada, Fernando Peña-Cortés, Jaime Tapia, Enrique Hauenstein, and Luis Vargas-Chacoff. "Macrobenthos of the coastal Budi Lagoon, southern Chile: Changes associated with seasonal environmental variation." Brazilian Journal of Oceanography 64, no. 3 (September 2016): 239–48. http://dx.doi.org/10.1590/s1679-87592016113306403.
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Abstract The purpose of the present study was to investigate the seasonal relationship of macrobenthos richness and abundance with sediment characteristics (i.e. texture and organic material) for the coastal Budi Lagoon in southern Chile. Physicochemical measurements and macrobenthos samples were taken over the course of a year at nine sampling stations. Sandy-muddy sediment was the most common, and high percentages of organic material were registered, varying significantly between seasons and stations. The recorded organic material was related to natural (resident wild birds) and anthropogenic (agriculture) sources. Regarding fauna, 28 benthonic taxa and 7092 individuals were identified, with temporal and spatial variations. The most abundant taxa year-round were the molluscs Littoridina cumingii and Kingiella chilenica and the bristle worm Prionospio patagonica. Together, the obtained results evidence the important impact of organic material on the macrobenthos, with macrobenthic richness and abundance decreasing in conditions of high organic material content. The recorded variations for different taxa may indicate a response to the land use around the Budi Lagoon, which is intensely subjected to agricultural and tourist activities.
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Haque, Md Mozammal, Abu Sayed Muhammad Sharif, Md Kawser Ahmed, Seema Rani, Md Habibur Rahman Molla, and Makidul Islam Khan. "Macrobenthic Faunal Abundance, Distribution and Diversity in the Bakkhali River, East Coast of Bangladesh." Dhaka University Journal of Earth and Environmental Sciences 10, no. 1 (October 31, 2021): 47–55. http://dx.doi.org/10.3329/dujees.v10i1.56279.
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The study aimed to assess the macrobenthos abundance and distribution from the Bakkhali River, East Coast of Bangladesh. Macrobenthic and water samples were collected from the upper, middle and lower part of the river during post-monsoon. Several indices were used to find macrobenthos abundance and distribution and their correlation with water parameters were also assessed. Present study identified a total of 628 macrobenthos individuals representing 10 major taxa at three stations where 9 taxa were reported in both upper and middle parts whereas only 7 taxa were observed at lower stream of the river. The highest abundance of macrobenthos (301.04 indivs/m2) was recorded at the lower stream and the lowest abundance (166.3 indivs/m2) was found at the upper part of the river. Macrobenthos distribution showed that the number of Oligochaetes was higher (220 indivs) followed by Nemertinas (169 indivs) and Polychaetes (145 indivs). Study findings reveal that macrobenthos abundance and distribution were comparatively higher at the lower stream than the upper and middle part because of higher level of pollution and sendimentation rate that might influence the macrobenthos abundance and diversity in the upper and middle part. The study also found macrobenthos abundance was proportionally increased with increasing salinity and pH. However, macrobenthos abundance was decreased with increasing temperature. Simpson index (D) was the highest (0.32) at middle and lower part and the lowest (0.23) was in the upper part. Shannon-wiener index (H) was also higher (1.68) at the upper part. Both the indices showed higher diversity at the upper part because of having maximum taxa in the station. Based on the H value, this study reported that Bakkhali River was moderately polluted since H value was in the range of 1.44 to 1.68. These might be because of anthropogenic sources of pollution in the vicinity of the river. This study suggests to take proper management strategies to control aquatic pollution and conserve aquatic biodiversity. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 10(1), 2021, P 47-55
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Kastoro, Woro W., Amiruddin, A. Azis, I. Aswandi, I. Al Hakim, Deky Lala, and Gesang Setyadi. "MACROBENTHIC COMMUNITY STRUCTURES OF THE OFFSHORE AREA OF MIMIKA DISTRICT, PAPUA." Marine Research in Indonesia 32, no. 2 (May 12, 2018): 109–21. http://dx.doi.org/10.14203/mri.v32i2.444.
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The study on macrobenthic community structures was carried out in the offshore area of Mimika district, Papua in 2005. Steep mountain slopes and some of the highest rainfall rates in the world, have generated tremendous sediment loads that have settled in the alluvial plain and been carried out into the estuaries and the Arafura Sea, creating a massive area of deposited natural sediments. The objective of this study was to determine how the benthic community structures of the offshore area (Arafura Sea) changes as a result of environmental conditions. To accomplish the objective, samples were collected from 40 stations which were divided into 4 contours (layers) of water depth, i.e. 5, 10, 20 and 40 m. Stations of each contour depth were established perpendicular to the river mouths of Mimika district. The results showed the bottom sediments were mostly silt-clay fractions except the deeper area (40 m depth) which was dominated by very fine sand fraction. Diversity indices, Shannon index (H') and Pielou's evenness (e) index ranged from 1.00-3.50 and 0.20-0.92 respectively. These indices tended to increase in the deeper areas. In total 266 species of macro-benthos were collected from the study area. Contrary to this, the densities tended to decrease in deeper areas with the range of 195.00 — 4110.00 individualsm-2. Polychaetes was the the dominant group, 50.80 — 71.80 % of the total family of macrobenthos. Among the macrobenthos, there were some families and group of taxa which had high densities such as Sipuncula, Nemertea and crustaceans including Ampeliscidae, Gammaridae and Israeidae. Among the polychaete group were the families Spionidae, Owenidae, Sternaspidae, Cossuridae, Capitellidae, Nephtyidae, Magelonidae and Pilargidae. Based on density, macrobenthos of the study area shows relatively high production. High rates of sedimentation of Ajkwa estuary does not influence the structure of macrobenthic communities in the offshore area.
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Gerdes, D. "Antarctic trials of the multi-box corer, a new device for benthos sampling." Polar Record 26, no. 156 (January 1990): 35–38. http://dx.doi.org/10.1017/s0032247400022749.
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ABSTRACTA multi-box corer is described, recently designed and constructed as part of the Euromar Project, through cooperation between the Alfred Wegener Institute for Polar and Marine Research and Fa. MAK Krupp Maschinenbau GmbH Kiel. Deployed successfully during the RV Polarstern expedition ANT VI/3 early in 1988, the multiple corer provided nine samples over a sampling area of 2–3 m2, thus obtaining more reliable abundance values than a single corer, and providing insights into the spatial variability of macrobenthic organisms. Equipped with a UW-video, the corer facilitates controlled economic collection of sediment and macrobenthos in depths down to 5000 m.
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Palma, Maritza, Eduardo Quiroga, Victor A. Gallardo, Wolf Arntz, Dieter Gerdes, Wolfgang Schneider, and Dierk Hebbeln. "Macrobenthic animal assemblages of the continental margin off Chile (22° to 42°S)." Journal of the Marine Biological Association of the United Kingdom 85, no. 2 (March 31, 2005): 233–45. http://dx.doi.org/10.1017/s0025315405011112h.
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A quantitative study of macrobenthos was carried out on three transects on the shelf and continental slope off Chile (22° to 42°S; from 100 to 2000 m water depth) within and beneath the oxygen minimum zone (OMZ). Macrobenthos mean densities ranged from 104 to 13 808 ind m−2, with highest values off Concepción (∼36°S), where highest chloroplastic pigment equivalents were also measured. Polychaetes were the numerically dominant group in all transects and depths, followed by peracarid crustaceans. Species richness and diversity correlated with observed changes in bottom-water oxygen concentrations and sediment-bound pigments. Our results show that the shelf macrobenthic communities were negatively affected by low oxygen. The non-metric multidimensional scaling (nMDS) analysis evidenced depth-related station groups which may be related to the different environments provided by the water masses involved. Indeed, the depth ranges of stations groups with their specific species inventories coincide quite well with the boundaries of the three important water masses in the region, the Equatorial Subsurface Water (∼50 m to ∼400 m depth), the Antarctic Intermediate Water (∼400 to ∼1200 m depth), and the Pacific Deep Water (>1200 m depth).
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Rodríguez, Marco A., and Pierre Magnan. "Community Structure of Lacustrine Macrobenthos: Do Taxon-based and Size-based Approaches Yield Similar Insights?" Canadian Journal of Fisheries and Aquatic Sciences 50, no. 4 (April 1, 1993): 800–815. http://dx.doi.org/10.1139/f93-093.
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We sampled the macrobenthos of three Laurentian Shield lakes to evaluate how the taxonomic structure and the size distribution (biomass spectra) of littoral communities varied (1) seasonally over the summer, (2) among lakes, and (3) in relation to substratum. Seasonal variation was limited: although total numbers differed significantly among months, the taxonomic structure (biomass) and the biomass size spectrum for each lake–year combination were relatively constant during the summer. Taxonomic structure differed significantly among lake–year combinations; substratum variables explained 55% of this variation. Biomass spectra were conspicuously bimodal for all lake–date combinations, with a main peak at 6.4–102.4 mg dry mass and a lesser peak at 0.1–0.4 mg dry mass. These spectra differ considerably from those reported previously for marine and lacustrine macrobenthos. The shape of the biomass spectrum was relatively invariant across months and lakes, which is remarkable in view of the differences in taxonomic structure, substratum, and fish species composition among lakes. This conservative pattern provides indirect evidence for structuring of littoral macrobenthic communities by size-dependent processes. The results illustrate that taxon-based and size-based approaches can emphasize strikingly different aspects of community structure.
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Gaston, Gary R., Chet F. Rakocinski, Steven S. Brown, and Carol M. Cleveland. "Trophic function in estuaries: response of macrobenthos to natural and contaminant gradients." Marine and Freshwater Research 49, no. 8 (1998): 833. http://dx.doi.org/10.1071/mf97089.
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Trophic ecology of macrobenthic communities in estuaries of the northern Gulf of Mexico was used to infer community function, determine effects of contaminants on macrobenthos, and provide insight into community responses following disturbance. The taxa that numerically dominated the region included few large, deep-burrowing suspension feeders that typify estuaries elsewhere. This pattern is indicative of disturbance, and results in dominance by trophic groups that live near the sediment–water interface (early benthic-community succession). Trophic structure was significantly related to several sediment contaminants (especially metals, polynuclear aromatic hydrocarbons, DDT), and three environmental gradients (salinity, depth, and sediment silt–clay content). Generally, trophic diversity increased and proportion of subsurface-deposit feeders (SSDF) decreased with salinity, meaning that a more even distribution of trophic structure was found at high-salinity stations. The trophic shift toward dominance by shallow, subsurface-deposit feeders in contaminated habitats may have dire implications for fisheries. Several important commercial and recreational fisheries of the region depend on fish that feed primarily at the sediment surface. Higher proportion of subsurface-deposit feeders, coupled with low macrobenthic density in contaminated sediments, may imply that limited energy is transferred to higher trophic levels.
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Putro, Sapto P., Jeanny Sharani, Widowati, Satriyo Adhy, and Suryono. "Biomonitoring of the Application of Monoculture and Integrated Multi-Trophic Aquaculture (IMTA) Using Macrobenthic Structures at Tembelas Island, Kepulauan Riau Province, Indonesia." Journal of Marine Science and Engineering 8, no. 11 (November 19, 2020): 942. http://dx.doi.org/10.3390/jmse8110942.
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Sustainable aquaculture needs to be considered when it comes to the utilization of water resources. The aim of this study was to apply biomonitoring using macrobenthic structures on both spatial and temporal applications of monoculture and integrated multi-trophic aquaculture (IMTA) at Tembelas Island, Kepulauan Riau Province, Indonesia. Samples of sediment were taken from three fish farm locations, namely from an IMTA site, a monoculture site, and a reference site. Macrobenthic organisms obtained through rinsing, sieving, and sorting were then identified under a stereo-microscope. Diversity of the macrobenthic assemblages was analyzed with a Shannon-Wiener index (H’). Equitability was expressed through Pielou’s evenness index. Finally, Bray-Curtis’ non-metric multi-dimensional scaling (NMDS) was used for similarities derived from log (X+1) transformed macrobenthic abundance to provide a visual representation of differences in their structure between sites over time. Results showed polychaetes exhibited differences in both variation and abundance of genera between the farm and reference site. The assemblage of macrobenthos at the IMTA site consisted of 9 genera of gastropods, 3 genera of bivalves, 5 genera of polychaetes, and 2 genera of crustaceans. At the monoculture site, 12 genera of gastropods, 4 genera of bivalves, 8 genera of polychaetes, 1 genera of crustaceans, and 1 genera of ophiuroid were observed. A relatively high abundance was observed at the reference site, with 27 genera of gastropods, 11 genera of bivalves, 3 genera of polychaetes, and 1 genera of crustacean. The favorable water conditions and possible absence of waste input from aquaculture resulting in a more suitable habitat for macrobenthic life may explain this relative abundance. Some of them were recognised as opportunistic taxa, i.e., Capitella sp., Heteromastus sp., and Lumbrinereis sp. Based on the diversity and evenness indices and the MNDS ordination, it can be concluded that the application of IMTA systems results in a suppressed or reduced potential impact on environmental disturbance due to aquacultural activities.
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Van Colen, Carl, Frederik Snoeck, Kris Struyf, Magda Vincx, and Steven Degraer. "Macrobenthic community structure and distribution in the Zwin nature reserve (Belgium and The Netherlands)." Journal of the Marine Biological Association of the United Kingdom 89, no. 3 (March 24, 2009): 431–38. http://dx.doi.org/10.1017/s0025315409003257.
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Distribution and structure of intertidal macrobenthic communities in the Zwin nature reserve, a lagoonal inlet consisting of marsh and tidal flat habitats, was investigated using univariate and multivariate analyses. Macrobenthos community structure was related to environmental characteristics and discussed in the framework of the implemented extension of the nature reserve.Based on explorative multivariate techniques, five different sample groups (SGs) were distinguished, which were, in general, located in different habitats of the Zwin nature reserve. The ecologically most important SGs consisted of the highest macrobenthic density, diversity and highest densities of Nereis diversicolor and Scrobicularia plana; these important prey species for wading birds and fish occurred in the deep tidal inlet channels. This habitat was characterized by fine to medium sand sediment and strong tidal currents, guaranteeing water renewal at each high tide. Other SGs were found in less and erratically submersed and thus stressed areas (i.e. tidal pond, salt pans and shallow flats). These assemblages were characterized by typical r-strategists (i.e. Capitella capitata and Polydora cornuta) and typical supralittoral, mobile species (i.e. Orchestia gammarellus and Collembola spp.). Being ecologically most important, the extension of wide, tidal creeks should be a prime target within the future development and management of the nature reserve.
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Stolyarov, A. P., and M. V. Mardashova. "Features of the Species and Spatial Structure of Macrobenthos in the Green Cape Lagoon (Kandalaksha Bay, White Sea)." Povolzhskiy Journal of Ecology, no. 2 (July 7, 2020): 228–40. http://dx.doi.org/10.35885/1684-7318-2020-2-228-240.
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Features of the species and spatial structure of macrobenthic sublittoral communities in a lagoon ecosystem on the Green Cape (the White Sea) were studied. 31 invertebrate species and 3 species of sea grasses and algae (Zostera marina, Cladophora sericea, and Fucus vesiculosus) were found in the sublittoral of the surveyed lagoon. The data on the species composition, diversity and spatial structure of macrobenthos communities indicate the predominance of littoral brackish-water and marine euryhaline macrobenthos species (Hydrobia ulvae, Tubificoides benedii, Chironomus salinarius, and Macoma balthica) in the coastal region of the lagoon, marine euryhaline littoral and sublittoral species (mainly polychaetes Heteromastus filiformis, Polydora ciliata, and Capitella capitata) in the central deeper region, and marine sublittoral less euryhaline species (Pontoporeia femorata, Anonyx nugans, Nereimyra punctata, Terebellides stroemi, Astarte montagui, Micronephthys minuta, and Atylus carinatus) at the exit from the lagoon. The ecosystem of the Green Cape lagoon belongs to lagoons significantly fenced off from the sea with depleted specific fauna (many littoral species) and largely influenced by carbon load and salinity. The reduced connection of the lagoon with the sea due to the continued rise of the White Sea coast (4 mm per year in this area) will contribute to a decrease in the species diversity and the predominance of few small eurytopic invertebrate species resistant to organic load, oxygen deficiency, and desalination.
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Rivera, C. G., and N. E. González. "NUEVOS REGISTROS DE MOLUSCOS MARINOS DE EL SALVADOR, AMÉRICA CENTRAL." CICIMAR Oceánides 24, no. 1 (June 4, 2009): 31. http://dx.doi.org/10.37543/oceanides.v24i1.51.
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Se presentan 27 especies de moluscos marinos de nuevo registro para El Salvador en la costa Pacífica de América Central. El listado incluye 112 individuos pertenecientes a 11 especies de bivalvos y 16 especies de gasterópodos recolectados con un nucleador manual durante una investigación del macrobentos desarrollada entre febrero y julio de 2005 en el Estero El Tamarindo. Se incluye información del hábitat y comentarios para todas las especies. New Records of marine mollusks from El Salvador, Central America New records of 27 species of marine mollusks from the Pacific coast of El Salvador (central America) are presented. The checklist includes 112 individuals of 11 bivalves and 16 gastropods species from El Tamarindo estuary. These were collected with a hand box-corer during an expedition on macrobenthos research between February and July, 2005. Habitat and relevant observations of each species are provided.
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Rivera, C. G., and N. E. González. "NUEVOS REGISTROS DE MOLUSCOS MARINOS DE EL SALVADOR, AMÉRICA CENTRAL." CICIMAR Oceánides 24, no. 1 (June 4, 2009): 31. http://dx.doi.org/10.37543/oceanides.v24i1.51.
Full textAbstract:
Se presentan 27 especies de moluscos marinos de nuevo registro para El Salvador en la costa Pacífica de América Central. El listado incluye 112 individuos pertenecientes a 11 especies de bivalvos y 16 especies de gasterópodos recolectados con un nucleador manual durante una investigación del macrobentos desarrollada entre febrero y julio de 2005 en el Estero El Tamarindo. Se incluye información del hábitat y comentarios para todas las especies. New Records of marine mollusks from El Salvador, Central America New records of 27 species of marine mollusks from the Pacific coast of El Salvador (central America) are presented. The checklist includes 112 individuals of 11 bivalves and 16 gastropods species from El Tamarindo estuary. These were collected with a hand box-corer during an expedition on macrobenthos research between February and July, 2005. Habitat and relevant observations of each species are provided.
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Labay, V. S., E. S. Korneev, E. V. Abramova, A. A. Ushakov, and E. S. Akhmadeeva. "Macrobenthos in the estuary of a typical «salmon» river of Sakhalin Island (on example of the Manuy River)." Izvestiya TINRO 202, no. 3 (October 5, 2022): 640–60. http://dx.doi.org/10.26428/1606-9919-2022-202-640-660.
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Species composition, structure, density and biomass of macrobenthos in the estuary of the Manuy River are described, its main communities are defined and their trophic characteristics, production, and distribution along the river channel are determined on the materials collected in July 2021. Three main biotopic zones of the estuary are identified by their hydrological features and parameters of macrobenthos: the river mouth, the lower estuary, and the upper estuary. Bilateral structure of salinity with 0.8–5.0 psu in the upper layer and > 27 psu near the bottom was observed in the lower estuary, whereas the upper estuarine zone was filled mostly by oligohaline water (0.8–1.6 psu), with only a thin refugial layer of the seawater (23.1 psu) at the depth of 0.9 m. In total, 24 species of benthic invertebrates and cyclostomes were presented in the macrobenthos. The species richness varied insignificantly across the estuary, from 4 species/section in its upper part to 9 species/section in the lower part, with lowered richness at the border between the lower and the upper estuarine zones, that corresponded to the theory of critical salinity. The density of macrobenthos distribution decreased from the river mouth to the boundary between the lower and upper zones (from 808.0 ± 162.0 ind./m2 to 16.0±2.8 ind./m2), then increased sharply in the upper estuary (up to 1384 ± 160 ind./m2). The total biomass had two peaks: in the lower estuary (4.381 ± 0.589 g/m2) and in the upper estuary (up to 28.950 g/m2), with the minimum of 0.076 ± 0.015 g/m2 between. The boundary between the meso-, polyhaline lower estuary and the oligohaline upper estuary had the width of several hundred meters. Four benthic communities were identified by various methods of cluster and ordination analysis, regardless of the method: two communities in the upper estuary (communities of Eogammarus kygi and Neomysis awatschensis), one community in the lower estuary (community of Hediste japonica) and the community of Haustorioides at the river mouth. Gathering detritivores formed the basis of biomass and macrobenthic production at the river mouth; collecting detritophages — sestonophages were the most significant in the lower estuary; while three key trophic groups were presented in the upper estuary: 1) collecting detritivores — macrogrinders — scavengers, 2) collecting detritivores, and 3) ground feeders — collecting detritivores. Daily production of macrobenthos was low at the river mouth and in the lower part of the lower estuary but increased in its upper part and in the upper estuary.
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Joydas, T. V., and R. Damodaran. "Testing depth-related multivariate patterns of macrofauna on the Indian continental shelf using reduced taxonomic resolution and data transformation." Journal of the Marine Biological Association of the United Kingdom 93, no. 1 (December 6, 2011): 37–45. http://dx.doi.org/10.1017/s0025315411001858.
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Although taxonomic sufficiency (TS) was developed for rapid environmental assessments, it has recently been adopted to study the spatial patterns of macrobenthos in relation to natural environmental gradients. To accept TS as a routine approach in wider benthic studies, it needs to be valid for various taxa and geographically different water masses. This study examined the effects of taxonomic resolution on depth-related multivariate patterns of macrobenthic polychaetes on the western Indian continental shelf. An extensive data set based on samples collected from a wide geographical area (7°–22°N latitudes) covering a large depth gradient (30–200 m) has been analysed. Species level polychaete community data had shown a significant variation between shallow and deeper waters. Our results indicated that generic and family level data also can detect community shifts along a depth gradient in a similar way to species level data. The entire western continental margin (200 m depth) is lying in the oxygen minimum zone (dissolved oxygen <0.5 ml l−1). This study indicated that family level results were sufficient to document the correlations of low oxygen on macrobenthic polychaetes. This study also tested the effects of transformations on depth-related patterns of polychaetes. In multivariate analyses, transformations play a role in defining the balance between contributions from common and rare species in the measure of similarity of two samples. Our results showed that the type of transformations did not make any prominent differences in the multivariate analyses.
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Maximov, A. A., and V. A. Petukhov. "Role of macro- and meiobenthos in the bottom communities of the inner Gulf of Finland." Proceedings of the Zoological Institute RAS 315, no. 3 (September 23, 2011): 289–310. http://dx.doi.org/10.31610/trudyzin/2011.315.3.289.
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The role of macro- and meiobenthos in the bottom communities of the inner Gulf of Finland was studied under different environmental conditions. In the shallow areas above 20 m isobath so-called principle of biocoenotic compensation was observed, that is, increase of meiobenthos quantitative characteristics with macrobenthos impoverishment. This principle was violated in the deeper areas, where bottom communities were wiped out periodically because of hypoxicanoxic events. The deep-water communities characterized by very unstable structure. The both studied benthos components were adversely af fected by hypoxia. In the following recovery succession macrobenthic polychaetes Marenzelleria spp. got advantage, which able to colonized quickly vacant bottoms because of presence of plankton larvae. The meiobenthos was typified by slower recovery. Thus, in the open waters of the Gulf of Finland meiobenthos can not compensate disappearance or strong impoverishment of macrozoobenthos in the case of near-bottom hypoxia formation, which in the last years became a common phenomenon for the most part of area of this water body.
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TAQWA, AMRULLAH, SUPRIHARYONO SUPRIHARYONO, and RUSWAHYUNI RUSWAHYUNI. "Primary productivity analysis of phytoplankton and community structure of macrobenthos based on mangrove density in conservation area of Tarakan City, East Kalimantan." Bonorowo Wetlands 3, no. 1 (June 15, 2017): 30–40. http://dx.doi.org/10.13057/bonorowo/w030103.
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Taqwa A, Supriharyono, Ruswahyuni. 2013. Primary productivity analysis of phytoplankton and community structure of macrobenthos based on mangrove density in conservation area of Tarakan City, East Kalimantan. Bonorowo Wetlands 3: 30-40. The studies of phytoplankton primary productivity and macrobenthic fauna community structure in different density of mangrove were carried out from May to June 2009 in mangrove conservation area, in Tarakan, East-Kalimantan, Indonesia. Content of chlorophyll-a converted to phytoplankton primary productivity, estimated with Strickland formula. Diversity of macrozoobenthos calculated with Shannon’s Index. Phytoplankton primary productivity in high, middle and low density of mangrove are range between 50.13±5.53 mgC/m3/d; 45.32±6.48 mgC/m3/d and 41.48±6.48 mgC/m3/d respectively. Shannon’s index value in low, middle and high density of mangrove are 2.24-2.61; 1.33-2.51 and 1.35-2.51 respectively. The results of this study showed a strong correlation between diversity of macrozoobenthos and the density of mangrove.
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Read, Paul. "The intertidal benthos and sediments of particulate shores in the Firth of Forth, Scotland, with particular reference to waste water discharges." Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 93, no. 3-4 (1987): 401–13. http://dx.doi.org/10.1017/s0269727000006849.
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SynopsisThe paper summarises and briefly discusses published and unpublished data relating to the physicochemical characteristics of the sediments and the occurrence and distribution of the intertidal macrobenthos of paniculate shores in the Firth of Forth. In general, the shores described are poor faunistically and in some areas this results partly from the influence of waste water discharges. Detailed information is available for only a limited number of the numerous beaches in the Firth of Forth. In consequence, this paper focusses attention on the results of a long term study of four beaches along the south shore of the firth which was undertaken as part of an environmental impact assessment in relation to the introduction of improved sewage treatment and disposal for the City of Edinburgh. Edinburgh Sewage Scheme and the firth into which it discharges are briefly described and data pertaining to changes in the intertidal sediments and the intertidal macrobenthic communities, which occurred in the Seafield Bay area of the firth following pollution abatement, are presented and discussed.
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Zhang, Anguo, Yanbin Gu, Xiutang Yuan, Marco C. Brustolin, Xiaolong Yang, Rongliang Zhang, Zhiwen Wang, and Honghua Shi. "Benthic Habitat Quality Assessment in Estuarine Intertidal Flats Based on Long-Term Data with Focus on Responses to Eco-Restoration Activity." Water 14, no. 23 (November 26, 2022): 3846. http://dx.doi.org/10.3390/w14233846.
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A long-term assessment of the benthic habitat quality of intertidal flats in Liaohe Estuary was conducted by three integrating ecological indices, AZTI’s Marine Biotic Index (AMBI), Multivariate-AMBI (M-AMBI), and Shannon–Wiener diversity index (H′) based on macrobenthos data from 2013 to 2020. The results showed that the macrobenthic communities were characterized by indifferent and sensitive species of AMBI ecological groups. The annual ranges of H′, AMBI, and M-AMBI were 0.77–1.56, 1.44–3.73 and 0.36–0.54, respectively. Noticeable differences were found among assessment obtained by these biotic indices. Approximately 100%, 24%, and 78% sampling sites had “moderate”, “poor”, and “bad” statuses as assessed by H′, AMBI, and M-AMBI, respectively. Compared with H′ and AMBI, M-AMBI may be more applicable to evaluate the benthic habitat quality of intertidal flats in Liaohe Estuary. Results suggest that the benthic habitat quality in the middle parts of intertidal flats still had an unacceptable status and has not improved radically to date after large-scale “mariculture ponds restored to intertidal flats”.
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Petukhov, V. A. "Features of meiobenthos in Lake Krivoe (Karelia)." Proceedings of the Zoological Institute RAS 320, no. 3 (September 23, 2016): 348–56. http://dx.doi.org/10.31610/trudyzin/2016.320.3.348.
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The paper presents the proportion of animals encountered in the coastal meiobenthos of Lake Krivoe (Karelia) which are typical for the majority of water bodies of the North-West of Russia: eumeiobentthic organisms – water mites, nematodes, cladocerans, harpacticoids, ostracods, benthic cyclops; organisms of pseudomeiobenthos – chironomids and oligochaetes. The main part in the biomass of meiobenthos in this zone accounts for water mites, chironomids and oligochaetes. In macrobenthos of this zone are registered: amphipods, larvae of caddis flies, mayfly larvae, larval Megaloptera, larval stoneflies, chironomid larvae, larval midges, also oligochaetes, leeches, bivalves, gastropods. Other groups of macrobenthic animals have almost equal low portions. Thus, the coastal zone of Lake Krivoe practically does not differ in composition of meiobenthos and macrobenthos from that of other water bodies of the North-West of Russia. Some features of meiobenthos community development in Lake Krivoe (Karelia) at depths of 9–32 m were found. In the coastal zone of the lake at the depth of 0.5 m meiobenthos has quantitative characteristics typical for regional mesotrophic water bodies. Deepwater meiofauna of Lake Krivoe is different from meiofauna of other deepwater lakes (Ladoga, Onega and Konstanz), where depths are inhabited by sufficiently rich, both qualitatively and quantitatively, meiobenthos. At greater depths we have discovered presence of the only species of nematodes (Paramononchus alimovi) in meiobenthos which was found in high numbers, both in abundance (6.8–93.0 thousand ind./m2) and biomass (0.044–0.596 g/m2). Structural and functional characteristics of deepwater meiobenthos Lake Krivoe varies greatly and are experiencing some impact of surface water temperature. The amount of seston sinking on the bottom increases in the middle of the vegetative season that probably leads to the sharp increase in the abundance and biomass of deepwater meiobenthos.
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Kanhai, Attish, and Rahanna Juman. "The effect of seasonal and human pressure on macrobenthic fauna in the Caroni Swamp Ramsar Site, Trinidad and Tobago." Revista de Biología Tropical 66, no. 3 (July 4, 2018): 1101. http://dx.doi.org/10.15517/rbt.v66i3.31419.
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Human pressures have placed many tropical estuaries in developing countries under increased levels of stress. The Caroni Swamp Ramsar Site, the largest mangrove swamp along the west coast of Trinidad, has been subjected to high levels of anthropogenic impacts including hydrological alteration and pollution from land-based sources since the 1920’s. While most of these impacts have been well documented, limited information exists on the macrobenthic communities in the swamp. This study addresses the paucity of information. The macrobenthic fauna in the main waterways of Caroni Swamp was sampled at 12 locations using a Van Veen 0.025m2 grab, once in the dry (April) and wet (August) season of 2015 with a total of 144 samples. The samples were sorted, counted and species were identified to the lowest possible taxonomic level. A total of 55 taxa were identified with polychaetes being the most abundant taxa. The ecological status of the macrobenthos was assessed using AZTI’s Marine Biotic Index (AMBI) and the multivariate-AMBI (M-AMBI). Physicochemical parameters were measured with a YSI multiparameter metre. Chemical analyses were also conducted on nitrates, nitrites, ammonia and reactive phosphates using standard methods. Overall, AMBI characterised the Caroni Swamp as “slightly disturbed” with a macrobenthic community of “poor” ecological status according to M-AMBI. Generally, the quality of the environment improves from the dry season to the wet season. However, seasonal variations in AMBI and M-AMBI were found to be site specific as some showed improvement in ecological status and macrozoobenthos quality while others showed degradation from the dry season to the wet season. The stations to the north of the swamp showed improvement from the dry season to the wet season while the opposite was observed in the more southern stations. One notable characteristic of the swamp was the high levels of pollutants, particularly ammonia, recorded in one of its major waterways, the Caroni River. This is in contrast to the other waterways within the swamp which experience much lower levels of pollutant input from land-based sources. The assessment of the Caroni Swamp using AMBI and M-AMBI may be useful for informing management strategies to conserve the wetland and improve environmental quality.
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Souza, Fernanda M., Eliandro R. Gilbert, Kalina M. Brauko, Luciano Lorenzi, Eunice Machado, and Mauricio G. Camargo. "Macrobenthic community responses to multiple environmental stressors in a subtropical estuary." PeerJ 9 (December 7, 2021): e12427. http://dx.doi.org/10.7717/peerj.12427.
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We assessed how multi- and univariate models reflect marine environmental health based on macrobenthic community responses to three environmental stressor categories: hydrodynamics, organic enrichment and metal contamination. We then compared the models with the benthic index AMBI (AZTI Marine Biotic Index). Macrobenthic community and physicochemical variables were sampled at 35 sites along Babitonga Bay, a subtropical estuary in Southern Brazil. Distance-based linear modelling identified depth, grain size and organic matter as well as Cu and Zn as key stressors affecting the macrobenthos. Using canonical analysis of principal coordinates (CAP), we developed three multivariate models based on the variability in community composition, creating stress gradients. The metal gradient showed better correlation with the benthic community. Sediment quality indices (Geoaccumulation Index and Contamination Factor) showed a low to moderate contamination status, with higher concentrations for Cr, Ni and Zn at the inner areas of the bay. According to AMBI, Babitonga Bay has a “good” environmental health status, and the AMBI values show stronger correlations with the hydrodynamic and organic enrichment gradients (r = 0.50 and r = 0.47) rather than the metal gradient (r = 0.29). Lumbrineridae polychaetes (not included in the AMBI list) and Scoloplos sp. were negatively related to the metal contamination gradient and were considered sensitive, while Sigambra sp., Magelona papillicornis, the gastropod Heleobia australis and species of the crustacean order Mysida were positively related to the gradient and considered tolerant to higher concentrations of metals in the sediment. Despite the inconsistency in the ecological classification provided by AMBI and its relationship with the metal gradient, our results suggest that the environmental quality was satisfactory for the studied gradients. The metal gradient showed the weakest correlation to AMBI. In such cases, the ecological classification of taxa by the index should be evaluated under the perspective of the action of inorganic genotoxic contaminants represented by metals.
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Jian, Xiaoyang, Bin Zhou, Qingyun Yu, and Xuexi Tang. "The Impacts of Offshore Oil Exploration and Development on Macrobenthos Community：A Case Study in Chengdao Oil Field." Aquatic Science and Technology 3, no. 2 (July 24, 2015): 13. http://dx.doi.org/10.5296/ast.v3i2.8052.
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<p><span style="font-family: Times New Roman;">Univariate and multivariate methods were used to study macrobenthos collected in October 2012 from the area around a new built offshore oil platform. The univariate parameters and community structure of benthic communities were related to environmental variables. Samples were taken with a 0.1 m<sup>2</sup> Van Veen grab (33×30 ×15 cm) at each station from 15 sampling stations. The mean values of species number, abundance and species diversity (<em>H’</em>) were 25 species/grab, 104 animals/grab and 3.12/grab, respectively. A total of 142 species was recorded. Total petroleum hydrocarbons and heavy metal were strongly positively related to species number, abundance and species diversity, suggesting that petroleum hydrocarbons have harmful effects on macrobenthic communities. The BIO-ENV analyses for all stations identified COD, heavy metal and petroleum hydrocarbons as the major environmental variables influencing the infaunal patterns. However, separate analyses for two groups produced stronger correlations and different best-correlated environmental variable combinations.</span></p>
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Sakamaki, T., and O. Nishimura. "Is sediment mud content a significant predictor of macrobenthos abundance in low-mud-content tidal flats?" Marine and Freshwater Research 60, no. 2 (2009): 160. http://dx.doi.org/10.1071/mf08173.
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Sediment mud content is a significant predictor of macrobenthos abundance in marine soft-bottom habitats. However, the mechanisms behind the non-linearity generally shown in mud–macrobenthos relationships have not been examined. The present study analysed spatial distributions of sediment properties and macrobenthos in a tidal flat system of the north-east coast of Japan and tested the hypothesis: the non-linearity of mud–macrobenthos relationship corresponds to changes in bed elevation variability and sediment cohesiveness. For two macrobenthos species studied, Nuttallia olivacea (Bivalvia) and Hediste spp. (Polychaeta), the relationships between mud content (<75 μm) and their density showed discontinuities at ~0.1% and ~20% mud contents. In stations with <0.1% mud content, the densities of both species were related positively to mud content and negatively to bed elevation variability, suggesting that mud content reflected negative effects of bed elevation variability on macrobenthos abundance. The stations where distinct changes were observed in macrobenthos densities below or above ~20% mud content were within an area where a shift between non-cohesive and cohesive sediments was found. Hence, the results of the present study support the hypothesis and also suggest that sediment mud content can be a sensitive predictor of macrobenthos abundance even within a relatively low and narrow range of mud content.
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Rahman, Mohammad Khaled, Mohammad Belal Hossain, Priyanka Rani Majumdar, M. Golam Mustafa, Mohammad Abu Noman, Mohammed Fahad Albeshr, Eijaz Ahmed Bhat, and Takaomi Arai. "Macrobenthic Assemblages, Distribution and Functional Guilds from a Freshwater-Dominated Tropical Estuary." Diversity 14, no. 6 (June 12, 2022): 473. http://dx.doi.org/10.3390/d14060473.
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Assessment of benthic diversity and estuarine ecological quality is becoming increasingly important. Estuaries are not only highly productive and variable environments, but they are also areas of high anthropogenic perturbations. In this study, benthic macrofauna were sorted, identified and analyzed from a freshwater-dominated tropical estuary along the Bay of Bengal to assess their community structure, distribution and functional guilds, and to uncover the environmental drivers influencing their distributional patterns. Results revealed that the studied physio-chemical variables (DO, pH, alkalinity and temperature) were significantly varied (p < 0.05) among the sites. Capitella sp. was dominant (18%) of the forty morphospecies recorded, indicating organic richness of the area. The ANOVA results revealed that macrobenthic density differed significantly (p < 0.01) between the study locations, and diversity indices (Shannon diversity index, H′) also differed significantly (F4,12 = 5.89; p = 0.02). The benthic density decreased from the head to the mouth, which could be related to salinity fluctuations and large freshwater discharges. Upstream sites were completely segregated from downstream and mid-estuarine sites, according to cluster analysis (CA). The SIMPER results clarified the site grouping pattern, showing that Mysis-1 spp., Capitella spp. and Nephtys-1 were the most significant contributors. From the communities, five functional trophic groups were identified where deposit feeders were the most dominant (66.44%). Most of the macrobenthos had strong positive correlations with DO (r = 0.92) and water temperature (r = 0.86) and a negative correlation with soil pH (r = −0.28), per correlation and CCA analyses. Individually, soil pH (r = 0.88) and alkalinity (r = 0.898) showed strong positive correlation with Capitella sp. and Chironomus sp.2. The above results indicate that macrobenthos of this estuary do not follow the usual pattern of spatial distribution, and they are structured by DO, alkalinity and soil pH. In addition, dominance of some pollution indicator species (Capitella sp. and Chironomus sp.) and deposit feeders indicates a poor ecological condition of the estuary.
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Ambarak, Muhammad Zhaqif, Medy Ompi, Darus Sa’dah J. Paransa, Joice R. T. S. L. Rimper, Antonius P. Rumengan, and Nego E. Bataragoa. "Keanekaragaman Makrobentos yang Menempati Agregasi Kerang, Septifer bilocullaris di Tiwoho, Kabupaten Minahasa Utara, Sulawesi Utara." JURNAL PESISIR DAN LAUT TROPIS 9, no. 3 (October 4, 2021): 133. http://dx.doi.org/10.35800/jplt.9.3.2021.38043.
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The purpose of this study was to determine the type and diversity of macrobenthos that inhabit the aggregation of Septifer bilocularis shellfish in the coastal waters of Tiwoho, North Minahasa Regency, North Sulawesi. Sampling of macrobenthos was carried out using core (PVC), both at the position of small aggregation (AK), middle large aggregation (ABT), and large edge aggregation (ABP). Sampling was carried out 4 times on different aggregations of shellfish. The data has been analyzed using the Diversity Index (H), the dominance index (D), and the Uniformity Index (E). It was identified that there were 25 types of macrobenthos occupying all aggregations of septifer bilocularis shells, which came from 11 classes including Gastropods, Bivalves, Malacostraca, Florideiphyceae, Ulvophyceae Ophiuroidea, Clitelatta, Maxillopoda, Globothalamea, Tubothalamea and Phaeophyceae. Biota diversity index varies from 1.60 – 1.70 which indicates that the biota in each aggregation has moderate diversity. The uniformity index value also varied, namely 0.069 for macrobenthos occupying the small aggregation (AK), then 0.066 in the middle large aggregation (ABT) and 0.064 in the large margin aggregation (GBP), which indicates the low uniformity of the macrobenthos in each aggregation. The dominance index of all aggregations was obtained between 0.27 - 0.36, which indicates that there is no species dominance for macrobenthos occupying different shellfish aggregations.Keywords: Diversity, Macrobenthos, Septifer bilocularis, Tiwoho
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Putri, Ratih Junika Widjaja, Carmudi Carmudi, and Anastasia Endang Pulungsari. "KUALITAS AIR WADUK PENJALIN BERDASARKAN STRUKTUR KOMUNITAS MAKROBENTHOS." Scripta Biologica 4, no. 1 (March 1, 2017): 69. http://dx.doi.org/10.20884/1.sb.2017.4.1.388.
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Macrobenthos is one of the biotic water constituent and can be used as bioindicator in determining water quality conditions. Water quality can be seen in terms of community structure of macrobenthos. The present study aimed to determine the physical and chemical water qualities in Penjalin Reservoir and to know the community structure of macrobenthos contained in the waters of Penjalin Reservoir. Community structure includes Density (organism/m2), Relative Density, Dominance Index (C) and Diversity Index (H ') as well as to determine the relationship between the water quality (physical and chemical) and the macrobenthos density. The physical and chemical qualities of Penjalin Reservoir water was good based on class III water quality standard according to PP No. 82 Ttahun 2001. Based on observation, 11 macrobenthos were obtained. Diversity Index (H') based on the criteria of Lee et al. (1978) showed moderate values (2.07 to 1.66) suggesting a low contamination level. The relationship of macrobenthos density and its chemical and physical quality of water pH, temperature, light penetration, depth, DO, BOD was weak, but had strong relationship with TSS. The results showed a linear regression equation Y = 898.76 X - 236.946 (Y = density and X = TSS) which could be interpreted that the more value of macrobenthos density the higher value of TSS contained in the water.
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Pallottini, Matteo, Sarah Pagliarini, Marianna Catasti, Gianandrea La Porta, Roberta Selvaggi, Elda Gaino, Leonardo Spacone, Alessandro Maria Di Giulio, Arshad Ali, and Enzo Goretti. "Population Dynamics and Seasonal Patterns of Chironomus plumosus (Diptera, Chironomidae) in the Shallow Lake Trasimeno, Central Italy." Sustainability 15, no. 1 (January 3, 2023): 851. http://dx.doi.org/10.3390/su15010851.
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Field sampling of littoral macrobenthos of the shallow Lake Trasimeno was conducted along 17 years (2005–2021) on 129 different occasions. This long-term field study deepens the knowledge concerning the life cycle of Chironomus plumosus (Diptera), the main responsible for summer chironomid swarms that adversely affect human littoral activities, providing useful information for its management. About 108,000 macrobenthic specimens were collected, belonging to Oligochaeta (Naididae) (62%), Diptera (Chironomidae) (37%), and only 1.5% to other invertebrate taxa. Eighteen chironomid taxa were found. The trend of chironomid density was not affected by C. plumosus, which showed a maximum increase in September. This peak is justified by the presence of large swarms of C. plumosus in late August in which the populations of the central area of Lake Trasimeno consistently participate. The larval density of this species did not increase over the 17 years. A detailed analysis of the sampled larvae and adult biomass catches from 2017 to 2020 reveals that four annual swarmings occurred: in April, July, August, and September–October. The water temperature remains higher than 20 °C during the night hours from the end of May to mid-September, strengthening the hypothesis of the three midge swarming cycles in the summer period until early autumn.
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Javandel, Nadia, and Maryam Akhoundian. "Temporal and spatial changes of macrobenthos communities in south east shores of the Caspian sea." Nexo Revista Científica 34, no. 04 (October 28, 2021): 1403–12. http://dx.doi.org/10.5377/nexo.v34i04.12687.
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In this research, Sampling of macrobenthos of Mazandaran beaches was performed in 7 stations at two depths of 5 and 10 meters during four seasons in 2020 using a grab with 8 replications in each station. In this study, a total of 10472 individuals were counted, which belonging to 22 species from 13 families. The highest frequency of macrobenthos (648 ± 170.79) was observed in spring and the highest amount of biomass (36.21 ±2.5 gr / m2) was observed in winter. Moreover, the highest prevalence of macrobenthos predominant groups during the sampling period was observed in Bivalves (40%), Crustaceans (36%), Annelids (22%) and Gastropoda (2%), respectively. The results of PERMANOVA analysis showed that the effect of two factors of season and depth impacted the biomass, abundance, species richness, species composition and community structure of macrobenthos significantly. Furthermore, the results showed that with increasing the depth from 5 to 10 meters, macrobenthos abundance increased by 4, 2, 1 and 9 times in spring, summer, autumn and winter, respectively. Moreover, increase in depth from 5 to 10m, the values of biomass and species richness have increased. In according to these results, it can be concluded that biomass and diversity index of macrobenthos communities change considerably in different seasons and depths. Therefore, natural changes of these variables should be considered when using these macrobenthos communities to assess the impact of environmental factors.
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Syakur, Akhmad. "STUDI MAKROBENTOS DI PESISIR PANTAI KARANG-KARANGAN KECAMATAN BUA KABUPATEN LUWU." Jurnal Biogenerasi 6, no. 1 (March 3, 2021): 45–54. http://dx.doi.org/10.30605/biogenerasi.v6i1.509.
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This study aims to see the abundance of macrobenthos and those that dominate macrobenthos on the coast of Karang-Karangan village, Bua sub-district, Luwu district and also to see its diversity index. This research was conducted in September 2020 on the coast of Karang-Karangan, Bua District, Luwu Regency. The type of research used in this research is descriptive research that describes the existence of macrobenthos on the coast of Karang-Karangan. The data analysis technique used in this research is descriptive data. The results of the research on the diversity of macrobenthos showed a low level of diversity, namely station I 0.57, station II 0.22 and station III 0.43.
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Manan, Abdul, and Taufik Indarmawan. "Pemantauan Lingkungan Estuaria Perancak Berdasarkan Sebaran Makrobenthos <br><i>[Environmental Monitoring Perancak Estuarine Based On Distribution Of Macrobenthos]<i>." Jurnal Ilmiah Perikanan dan Kelautan 3, no. 2 (November 1, 2011): 215–20. http://dx.doi.org/10.20473/jipk.v3i2.11608.
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Abstract One method to monitor the water quality is with macrobenthos studies. Motility of macrobenthos is very rare that more showed the characteristics of an environment. The aim of this study was to know the composition distribution in the region macrobenthos of Perancak estuarine for monitoring the condition of estuaries in the region. The method used is a descriptive method of data collection. Monitoring of macrobenthos distribution includes several stages such as stage of the survey and ground check, preparation tools and materials, taking physical and chemical parameters in the field, the separation and identification of samples and the last is the data analysis. The results of this monitoring showed characteristic macrobenthos of Perancak estuarine region consists of group annelids, crustaceans, gastropods and bivalves. Diversity index (H ') may be early prediction of the environmental quality of Perancak estuarine (bio-monitoring) showed there were distinct differences in contamination concentration at each station from severe to mild category.
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Wang, Qiuxuan, Carlos Duarte, Li Song, George Christakos, Susana Agusti, and Jiaping Wu. "Effects of Ecological Restoration Using Non-Native Mangrove Kandelia obovata to Replace Invasive Spartina alterniflora on Intertidal Macrobenthos Community in Maoyan Island (Zhejiang, China)." Journal of Marine Science and Engineering 9, no. 8 (July 22, 2021): 788. http://dx.doi.org/10.3390/jmse9080788.
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Spartina alterniflora has extensively invaded the coastline of China, including in Maoyan Island of Zhejiang Province. Ecological restoration has been conducted using non-native mangrove Kandelia obovata to replace S. alterniflora in an attempt to restore the impacted intertidal zones. To illustrate the ecological effectiveness of the restoration projects, macrobenthos communities were studied among different habitats within the restored areas, including one non-restored S. alterniflora marsh (SA) and three differently-aged restored K. obovata stands planted in 2003, 2009, and 2011 respectively (KF14, KF8, and KF6). Besides, one unvegetated mudflat (MF) adjacent to the non-restored S. alterniflora marsh and one K. obovata forest transplanted in 2006 (RKF) at a previously barren mudflat without invasion history of S. alterniflora were set as reference sites. A total of 69 species of macrobenthos were collected from Maoyan Island, and the species richness was dominated by gastropoda (23 species), polychaeta (18 species), and malacostraca (16 species). There was no significant difference between the six sites in terms of the abundance of macrobenthos, with the average values of abundance peaking in KF6 (734.7 ind m−2) and being lowest in RKF (341.3 ind m−2). The six sites had significant differences in terms of the biomass of macrobenthos. The KF8 site contained the highest average biomass (168.3 g m−2), whereas the MF site had the lowest (54.3 g m−2). The Shannon-Wiener diversity index and Pielou’s evenness index of the macrobenthos did not exhibit significant differences among the six sites. However, the results of permutational multivariate analysis of variance (PERMANOVA) revealed significant spatial differences in the macrobenthos community structure between the sites. Since KF14 shared a similar macrobenthos community structure with RKF, while representing a strikingly different structure from SA, we infer that ecological restoration using K. obovata can restore the macrobenthos community to resemble to a normally planted K. obovata forest about 15 years after restoration.
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Swapnali Gole, Prasad Gaidhani, Srabani Bose, Anant Pande, Jeyaraj Antony Johnson, and Sivakumar Kuppusamy. "New distribution record of globally threatened Ocean Turf Grass Halophila beccarii Ascherson, 1871 from the North Andaman Islands highlights the importance of seagrass exploratory surveys." Journal of Threatened Taxa 14, no. 1 (January 26, 2022): 20406–12. http://dx.doi.org/10.11609/jott.7719.14.1.20406-20412.
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Halophila beccarii, listed as ‘Vulnerable’ on the IUCN Red List, aids in seagrass and mangrove succession, acts as a substrate stabilizer and provides feeding grounds for mega-herbivores like dugongs. This species was first recorded from the Andaman & Nicobar Islands in 2015, and its distribution status within the archipelago remains under-investigated. We report a new distribution record of H. beccarii from the North Andamans and shed light on its inter-island distribution. H. beccarii was recorded from a mixed meadow comprising of Cymodocea rotundata (20.5 ± 28.8%, mean seagrass cover), Thalassia hemprichii (16.3 ± 23.3%, mean seagrass cover), and Halodule pinifolia (6.3 ± 12.1%, mean seagrass cover) at Pokkadera, North and Middle Andaman district. H. beccarii had the highest mean seagrass cover (30 ± 34.7%) and shoot density (103.5 ± 68.3 shoots/ m2) among sympatric seagrass species. We also recorded eight seagrass-associated macrofaunal groups (gastropods, bivalves, polychaetes, foraminiferans, nematodes, brachyurans, decapods and asteroids) from the infaunal and epibenthic micro-habitats within the meadow. Infaunal macrobenthos had a much higher density (73.5 ± 129.7 individuals/m2) than the epibenthic macrofauna (0.4 ± 1.5 individuals/m2), possibly influenced by the seagrass canopy structure and biomass. Overall, gastropods were the most dominant macrobenthic faunal group (overall mean 95.0 ± 106.1 individuals/m2). The present findings emphasize the need for more exploratory surveys to understand H. beccarii distribution in the Andaman & Nicobar archipelago to identify priority conservation areas.
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Kim, Hye Seon, and Haryun Kim. "Environmental Characteristics and Macrobenthic Community Structure of Yubu Island, a UNESCO-Designated Migratory Bird Sanctuary in the South Korea." Journal of Marine Science and Engineering 9, no. 5 (April 22, 2021): 455. http://dx.doi.org/10.3390/jmse9050455.
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This study investigated the environmental characteristics and macrobenthic community structures of an intertidal flat located on Yubu Island in the western coastal area of the Yellow Sea of South Korea. The study site has been well known for the migratory bird protection designated by UNESCO. We collected the samples of surface and depth core sediments and macrobenthos from the unused saltern and the area surrounding it in July 2017. Our results demonstrated that the means of mud, total carbon, and total nitrogen contents were 50%, 0.35% and 0.05%, respectively, and the origin of sediment composed of marine sources. The sedimentation rate ranged from 0.99 to 1.66 cm y−1, which was higher than other tidal flats in the Yellow Sea. The result of a topographic analysis indicated that the area in the unused saltern was 289.489 m2, and the length and width were 625 m and 500 m, respectively. A total of 13 species occurred with a mean density of 92 ind. m−2 and a mean biomass of 58.6 gWWt m−2. The Heteromastus filiformis (23.1%, 21 ind. m−2) was the most dominant species, followed by Perinereis linea (19.2%, 18 ind. m−2) and Tubuca arcuata (17.3%, 16 ind. m−2). Thus, this environmental information will help to establish policies to protect migratory birds in the future.
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Aryanti, Nirmala Ayu, Febri Arif Cahyo Wibowo, Mahidi Mahidi, Frita Kusuma Wardhani, and I. Komang Tri Wijaya Kusuma. "Hubungan Faktor Biotik dan Abiotik Terhadap Keanekaragaman Makrobentos di Hutan Mangrove Kabupaten Lombok Barat." Jurnal Kelautan Tropis 24, no. 2 (May 19, 2021): 185–94. http://dx.doi.org/10.14710/jkt.v24i2.10044.
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High human activity around the coastal area will affect the mangrove ecosystem and the biota such as macrobenthos. Benthic diversity can reflect conditions of mangrove ecosystem, that slow growth and sensitive to environmental changes. This study aims to determine the influence of biotic and abiotic environments on the macrobenthos in Cendi Manik Village, Sekotong District, West Lombok Regency, West Nusa Tenggara. Data collection of macrobenthos, biotic and abiotic environments in natural and rehabilitation mangrove, then the diversity species of macrobenthos with biotic and abiotic environmental variables were analyzed multiple regression. The most dominant vegetations are Rhizophora mucronata Lam and Avicennia marina Forssk. The diversity index for macrobenthos is low (H’ 1,207) in natural and rehabilitation mangrove. Macrobenthos between two location have high similarity with 84,6%. The result of multiple regression test showed that most influencing of macrobenthos were mud thickness and brightness. Aktivitas manusia yang tinggi sekitar kawasan pesisir akan mempengaruhi ekosistem mangrove dan biota di dalamnya seperti makrobentos. Keanekaragaman bentos dapat mampu mencerminkan kondisi ekosistem mangrove, pertumbuhan yang lambat dan sensitif terhadap perubahan lingkungan. Penelitian ini bertujuan untuk mengetahui hubungan lingkungan biotik dan abiotik terhadap makrobentos yang ada di Desa Cendi Manik Kecamatan Sekotong Kabupaten Lombok Barat Nusa Tenggara Barat. Pengumpulan data makrobentos, biotik dan abiotik lingkungan pada hutan mangrove alam dan rehabilitasi, kemudian keanekaragaman jenis makrobentos dengan variabel lingkungan biotik dan abiotik dianalisis regresi berganda. Jenis vegetasi yang paling mendominasi adalah jenis Rhizophora mucronata Lam dan Avicennia marina Forssk. Keanekaragaman jenis makrobentos termasuk dalam kategori rendah (H’ 1,207) di hutan mangrove alam dan rehabilitasi. Jenis makrobentos antara dua lokasi tersebut memiliki kemiripan yang tinggi yaitu 84,6 %. Uji regresi berganda diperoleh variabel lingkungan yang paling berpengaruh pada keanekaragaman jenis makrobentos adalah ketebalan lumpur dan kedalaman kecerahan air.
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Strayer, David L., Kathryn A. Hattala, Andrew W. Kahnle, and Robert D. Adams. "Has the Hudson River fish community recovered from the zebra mussel invasion along with its forage base?" Canadian Journal of Fisheries and Aquatic Sciences 71, no. 8 (August 2014): 1146–57. http://dx.doi.org/10.1139/cjfas-2013-0549.
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In the first decade after zebra mussels (Dreissena polymorpha) appeared in the Hudson River, the biomass of zooplankton and deepwater macrobenthos fell by ∼50%, while the biomass of littoral macrobenthos rose by >10%. These changes in the forage base were associated with large, differential changes in the abundance, geographic distribution, and growth rates of openwater and littoral fish. In recent years, populations of zooplankton and deepwater macrobenthos have risen towards pre-invasion levels, while littoral macrobenthos remained unchanged. We therefore hypothesized that the abundance, distribution, and growth rates of openwater fish species would shift back towards pre-invasion levels, while littoral fish species would not change. Our analysis of large data sets for young-of-year fishes found no systematic change in the abundance or geographic distribution of either group of fish in the Hudson. We did find a marked increase in growth rates of openwater fish, but no change in growth rates of littoral fish, in support of our hypothesis. Our study shows that the ecological effects of a biological invasion may change over time.
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Destiana, Destiana, Siti Puji Lestariningsih, Herlina Darwati, and Dian Iswandaru. "Biodiversitas Makrobentos Sebagai Indikator Kualitas Habitat Pada Ekosistem Mangrove." Journal of Tropical Marine Science 5, no. 1 (May 2, 2022): 37–44. http://dx.doi.org/10.33019/jour.trop.mar.sci.v5i1.2940.
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Macrobenthos is one of the organisms that play an essential role in the decomposition process of mangrove plant litter. Other organisms then use the result of the decomposition process in mangrove forests. Still, the existence of these organisms is susceptible to environmental changes, so it is often interpreted as one of the indicators of habitat quality. This research aims to determine the sustainability and diversity of macrobenthos as an indicator of habitat quality in mangrove forests. Data collection is carried out by the plot cluster method. Sample deflating points using purposive sampling. Cluster plots are placed on three observation stations with different conditions, namely natural mangrove forests (station 1), former pond areas (station 2), and areas adjacent to agricultural land (station 3). Each station has three plots measuring 10 x 10 meters to record tree level mangrove vegetation. Each plot has five subplots measuring 1 x 1 meter to take macrobenthos samples. The total number of plots is nine plots for mangrove vegetation and 45 subplots for macrobenthos. The results showed that macrobenthos ability ranged from 10 individuals / m2 to 15 individuals / m2, with the diversity index ranging from 1.49 to 1.73. This condition illustrates that mangrove habitat is included in the medium classification in other words, based on the state of the structure of the biota Bentos community in the mangrove forest in Siantan District, Mempawah regency is fairly a stable category.
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Wang, Linfang, Hua Li, Jinhua Dang, Ying Zhao, Yu’en Zhu, and Pengming Qiao. "Effects of Urbanization on Water Quality and the Macrobenthos Community Structure in the Fenhe River, Shanxi Province, China." Journal of Chemistry 2020 (March 9, 2020): 1–9. http://dx.doi.org/10.1155/2020/8653486.
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The relationships between land use types, water and sediment parameters, and macrobenthos community structures in the upper and middle reaches of the Fenhe River and urbanization intensity were studied. Samples were collected from 23 sampling sites. Spearman rank correlation analyses were performed to assess the relationships between the percentages of impervious area or the proportions of four land uses and the water and sediment physicochemical properties, heavy metal and polycyclic aromatic hydrocarbon concentrations in water and sediment, and biological indicators of the macrobenthos communities. Some water parameters (temperature, oxidation-reduction potential, electrical conductivity, total N concentration, total P concentration, ammonia-N concentration, and nitrate-N concentration), some sediment parameters (total N concentration, total P concentration, organic matter content, percentage of particles with diameters <2 mm, and polycyclic aromatic hydrocarbon, Cd, Cr, Cu, Ni Pb, and Zn concentrations), and some macrobenthos parameters (Berger–Parker index and percentages of collectors, tolerant taxa, and Oligochaeta) significantly positively correlated with the percentage of impervious area. Some water parameters (pH and dissolved oxygen concentration), some sediment parameters (percentage of particles with diameters >2 mm), and some macrobenthos parameters (total biomass, total number of taxa, Shannon’s index, N diversity index, and percentages of Ephemeroptera, Plecoptera, Trichoptera, filterers, scrapers, and sensitive taxa) significantly negatively correlated with the percentage of impervious area. The results indicate that intensification of urbanization has strongly affected the water, sediment, and macrobenthos in the Fenhe River watershed.
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Daniels, Aghogho O. "Composition and Abundance of Macrobenthos in the Lagos Lagoon." International Journal for Innovation Education and Research 3, no. 8 (August 31, 2015): 154–59. http://dx.doi.org/10.31686/ijier.vol3.iss8.421.
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The composition and Abundance of Macrobenthos in the Lagos Lagoon was investigated from June, 2012 to March, 2013 in Eleven (11) study stations in the Lagos Lagoon. A total of 1861 Macrobenthos belonging to three phyla; Mollusca, Arthropoda and Annelida were encountered. The Gastropod Pachymelina aurita was the most dominant species with a percentage composition of 23.5% while the Polychaete worm Nereis indica closely followed with a percentage composition of 21.5%, Anadara senilis and Crassoterea tulipa had the least representative (1.1%). All the stations studied had relatively low species diversity. The Shanon – Weiner index of diversity (H) ranged from 0.38 to 0.8. Margalef index (d) ranged from 0.91 to 2.41. The overall Macrobenthos diversity of the stations studied in the Lagos lagoon was relatively low.