Journal articles on the topic 'Macroinvertebrates'
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1
Samuelsson, Evelin, and Angelo Gilberto Manzatto. "ANÁLISE CIENTOMÉTRICA DE PESQUISA MUNDIAL SOBRE MACROINVERTEBRADOS AQUÁTICOS NO BANCO DE DADOS DA WEB OF SCIENCE ENTRE 1947 E 2022." Revista Científica FAEMA 14, no. 2 (August 25, 2023): 273–93. http://dx.doi.org/10.31072/rcf.v14i2.1335.
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O estudo teve como objetivo analisar as tendências mundiais nos estudos relacionados a macroinvertebrados aquáticos através dos instrumentos da Cientometria. O estudo cientométrico foi conduzido no portal Web of Science, com acesso ao conteúdo integral, utilizando a busca booleana com as seguintes combinações de palavras: “aquatic macroinvertebrates” OR “aquatic macroinvertebrate” OR “aquatic insects” OR “aquatic insect” OR “benthic macroinvertebrates” OR “benthic macroinvertebrate” OR “benthic community” OR “benthic communities”. A busca resultou em n=17.997 trabalhos científicos, cujo tema estava relacionado ao estudo de macroinvertebrados aquáticos, em um recorte temporal de 75 anos. Verificou-se que a produção científica relacionada aos macroinvertebrados aquáticos aumentou no decorrer dos anos de 1947 a 2022, apresentando correlação positiva entre o número de estudos e o ano de publicação (R=0,84). A análise identificou publicações em 182 países, sendo que, 58.89% dos estudos foram realizados no Estados Unidos da América (EUA), Canadá, Brasil, Alemanha e Espanha. As pesquisas se concentraram principalmente na área de Environmental Sciences Ecology. Foi possível concluir que há uma tendência para a continuidade e o aumento da produção científica relacionada aos macroinvertebrados aquáticos em nível global, os quais os países, pesquisadores e instituições que mais publicam são aquelas que o incentivo e as redes de cooperação entre autores são mais fortes.
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Robichaud, Lisa, Philippe Archambault, Gaston Desrosiers, and Christopher W. McKindsey. "Influence of Suspended Mussel Aquaculture and an Associated Invasive Ascidian on Benthic Macroinvertebrate Communities." Water 14, no. 17 (September 3, 2022): 2751. http://dx.doi.org/10.3390/w14172751.
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Many benthic macroinvertebrates are associated with cultured bivalves but are normally excluded from studies on the environmental effects of bivalve aquacultures. We evaluated the hypothesis that mussel aquaculture increases overall “benthic” macroinvertebrate productivity by considering both sediment- and mussel sock-associated macroinvertebrates. It was predicted that the presence of the invasive ascidian Styela clava would increase this effect by increasing the mussel sock’s biogenic structure. Macroinvertebrates in sediments and on mussel socks were sampled in eight bays on Prince Edward Island, Canada: three were invaded by Styela clava and there were five where it was absent. Infaunal macroinvertebrates associated with benthic sediments (sediment macroinvertebrates) within leases were less abundant relative to the control locations outside of leases and showed a trend towards decreased biomass and productivity. Abundance of mussel sock-associated macroinvertebrates was greater in bays with S. clava than in bays without it. When sediment and mussel sock macroinvertebrates were considered together as “benthic” communities within mussel leases and compared to sediment macroinvertebrate communities outside of leases, “benthic” macroinvertebrate abundance, biomass, and productivity were greater inside mussel leases than in areas outside of them. The presence of S. clava did not influence this trend. Although the ecological role of the macroinvertebrates associated with suspended mussels is likely not equivalent to those associated with benthic sediments, the presence of macroinvertebrates on suspended mussels, in some measure, offsets the impacts on the abundance, biomass, and productivity of macroinvertebrate communities at the farm-scale.
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Muli, Anita, Teck Yee Ling, Siong-Fong Sim, and Jongkar Grinang. "Macroinvertebrates of the Tributaries of Upper Baleh River, Sarawak." Borneo Journal of Resource Science and Technology 9, no. 1 (June 30, 2019): 26–35. http://dx.doi.org/10.33736/bjrst.1582.2019.
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Studies on Baleh River with respect to aquatic fauna currently remains limited. Hence, this paper presents thespecies richness and composition of macroinvertebrates14 tributaries of Upper Baleh River in Kapit Division,Sarawak. A total of 1,154 individuals from 10 orders, 43 families and 66 genera of macroinvertebrates werecollected. The highest number of macroinvertebrate was taken from Naah River (201 individuals) and the leastfrom Ukit River (15 individuals). The order Ephemeroptera was the most abundant, with 45% of the totalindividuals caught, followed by Trichoptera (23%), Hemiptera (10%), and Coleoptera (9%). Three biologicalindices were used to measure the diversity of macroinvertebrate of which the values of the indices were low:Shannon diversity index (1.54–2.54), Shannon evenness index (0.33–0.89) and Margalef richness index (1.67–4.90). The composition of functional feeding groups varies between first and fourth order streams, which ispossibly an indication of ecological effects of siltation due to logging activities in the area.
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McKie, B. G. L., and P. S. Cranston. "Keystone coleopterans? Colonization by wood-feeding elmids of experimentally immersed woods in south-eastern Australia." Marine and Freshwater Research 49, no. 1 (1998): 79. http://dx.doi.org/10.1071/mf97086.
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Macroinvertebrates on immersed woods in streams in montane south-eastern Australia respond to differences in wood taxa, according to a 4-month colonization study of experimentally positioned sticks. Xylophagous elmids (Coleoptera : Elmidae) strongly preferred local native Eucalyptus over other types of wood including non-native softer timbers (Pinus and Alnus). Where gouging elmids were abundant (in native forest streams with native riparian vegetation), immersed Eucalyptus wood supported high abundances of other macroinvertebrates; in their absence (in open grassland streams), Eucalyptus supported few other macroinvertebrates. Macroinvertebrate-gouged channels were present disproportionately on Eucalyptus sticks relative to other wood species. It is proposed that xylophagous elmid beetles are the principal macroinvertebrate modifiers of wood in these south-eastern Australian streams, where their gouging of channels increases surface area, thereby facilitating colonization by other macroinvertebrates and wood-decaying microorganisms and fungi.
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Casey, Jordan M., Marie E. Wilson, Nicholas Hollingshead, and David G. Haskell. "The Effects of Exurbanization on Bird and Macroinvertebrate Communities in Deciduous Forests on the Cumberland Plateau, Tennessee." International Journal of Ecology 2009 (2009): 1–10. http://dx.doi.org/10.1155/2009/539417.
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To investigate the potential causes of changes to bird communities in exurban areas, we examined the relationship between bird and macroinvertebrate communities in exurbanized forest. We randomly located sampling points across a gradient of exurbanization. We used point counts to quantify bird communities and sweep netting, soil cores, pitfalls, and frass collectors to quantify macroinvertebrates. Bird communities had higher richness and abundance in exurban areas compared to undeveloped forests, and lost some species of conservation concern but gained others. The macroinvertebrate community was slightly more abundant in exurban areas, with a slight shift in taxonomic composition. The abundance of macroinvertebrates in soil cores (but not pitfalls) predicted the abundance of ground-foraging birds. The abundance of macroinvertebrates in sweep nets was not associated with the abundance of aerial insectivore birds. Exurbanization therefore appears to change bird and macroinvertebrate communities, but to a lesser extent than agricultural forest fragmentation or intensive urbanization.
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Germ, Mateja, Žiga Tertinek, and Igor Zelnik. "Diversity of Macrophytes and Macroinvertebrates in Different Types of Standing Waters in the Drava Field." Water 16, no. 8 (April 16, 2024): 1130. http://dx.doi.org/10.3390/w16081130.
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The diversity of macrophytes and macroinvertebrates in small standing waters of different origins and characteristics was investigated. This survey covered 19 ponds in the Drava field in northeastern Slovenia. The influence of the macrophytes on the macroinvertebrates was investigated and the main environmental factors that had the most significant influence on the composition of the two communities were identified. Sixty-seven taxa of macrophytes and seventy-three families of macroinvertebrates were identified. We found that a diverse macrophyte community has a positive effect on the macroinvertebrate community. In contrast, the dominance of a single macrophyte species has a strong negative influence on the richness of the macroinvertebrate community. The taxonomic richness and abundance of the macroinvertebrate community in the natural ponds was statistically significantly higher than that in artificial ponds. The significant differences in the environmental characteristics between the natural and artificial ponds, such as the macrophyte cover, conductivity, and riparian zone width, may account for these differences. Our study suggests that a greater diversity of macrophyte and macroinvertebrate communities in natural ponds is enabled by abundant but diverse macrophyte cover, low phosphorus content, and wide riparian zones, which require appropriate management of ponds and their catchments.
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Luo, Zhi Wen, and Wen Yan Wu. "A Study on the Tolerance Value and Biodiversity of Benthic Macroinvertebrates." Applied Mechanics and Materials 513-517 (February 2014): 3283–86. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3283.
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Macroinvertebrates are important components of stream ecosystems. A field experiment was conducted to study the effects of substrate particle size, shape, and roughness on the composition and biodiversity of macroinvertebrates. The results show that the particle sizes, porosity, and interstial dimensions of the substrate affect the macroinvertebrate community, while the shape and surface roughness of the substrate do not strongly affect the macrobenthos composition and density. The macroinvertebrate composition in gravel is stable. The density and species richness in the gravels, leaf humus and are much higher than those in the black silt and sands.
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Carew, M. E., S. J. Nichols, J. Batovska, R. St Clair, N. P. Murphy, M. J. Blacket, and M. E. Shackleton. "A DNA barcode database of Australia’s freshwater macroinvertebrate fauna." Marine and Freshwater Research 68, no. 10 (2017): 1788. http://dx.doi.org/10.1071/mf16304.
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Macroinvertebrates are widely used for monitoring freshwater ecosystems. In most monitoring programs, identifications take substantial time and expense. Methods that improve the speed, accuracy and cost-effectiveness of macroinvertebrate identification would benefit such programs. Increasingly, DNA barcodes are being used to provide accurate species-level identifications and have the potential to change how macroinvertebrates are routinely identified. Herein we discuss the need for DNA barcodes of freshwater macroinvertebrates with particular reference to Australia. We examine the use of DNA barcodes for species identification and compare DNA barcoding efforts of macroinvertebrates from Australia with those globally. We consider the role of high-throughput sequencing of DNA barcodes in freshwater bioassessment and its potential use in biosurveillance. Finally, we outline a strategy for developing a comprehensive national DNA barcode database for Australian freshwater macroinvertebrates and present the initial efforts in creating this database.
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Hughes, Robert M., Alan T. Herlihy, Randy Comeleo, David V. Peck, Richard M. Mitchell, and Steven G. Paulsen. "Patterns in and predictors of stream and river macroinvertebrate genera and fish species richness across the conterminous USA." Knowledge & Management of Aquatic Ecosystems, no. 424 (2023): 19. http://dx.doi.org/10.1051/kmae/2023014.
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Both native and non-native taxa richness patterns are useful for evaluating areas of greatest conservation concern. To determine those patterns, we analyzed fish and macroinvertebrate taxa richness data obtained at 3475 sites collected by the USEPA's National Rivers and Streams Assessment. We also determined which natural and anthropogenic variables best explained patterns in regional richness. Macroinvertebrate and fish richness increased with the number of sites sampled per region. Therefore, we determined residual taxa richness from the deviation of observed richness from predicted richness given the number of sites per region. Regional richness markedly exceeded average site richness for both macroinvertebrates and fish. Predictors of macroinvertebrate-genus and fish-species residual-regional richness differed. Air temperature was an important predictor in both cases but was positive for fish and negative for macroinvertebrates. Both natural and land use variables were significant predictors of regional richness. This study is the first to determine mean site and regional richness of both fish and aquatic macroinvertebrates across the conterminous USA, and the key anthropogenic drivers of regional richness. Thus, it offers important insights into regional USA biodiversity hotspots.
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Chi, Shiyun, Jun Hu, Ming Li, and Chenyan Wan. "What Are the Relationships between Plankton and Macroinvertebrates in Reservoir Systems?" Water 15, no. 15 (July 25, 2023): 2682. http://dx.doi.org/10.3390/w15152682.
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Macroinvertebrates and plankton play crucial roles in reservoir food webs; however, their relationships have received limited attention. This study investigates the associations between plankton and macroinvertebrates in fifty selected reservoirs. During the spring season, significant concordances were observed in species richness between phytoplankton and zooplankton, as well as between zooplankton and macroinvertebrates. In contrast, during the summer season, the concordance in species richness between phytoplankton and macroinvertebrates was higher compared to other assemblages. Although macroinvertebrates showed a strong connection with phytoplankton in terms of species richness in both seasons, the congruencies were not statistically significant. Partial least squares regression (PLSR) analysis revealed that the densities of phytoplankton, Chlorophyta, Cyanophyta, and protozoans significantly influenced the total macroinvertebrate density in both seasons. Additionally, the densities of mollusks and aquatic insects were affected by the densities of Chlorophyta and Cyanophyta, while the density of oligochaetes was influenced by the density of Chlorophyta. These findings indicated that phytoplankton and zooplankton serve as primary food sources for macroinvertebrates, highlighting the close relationship between plankton and macroinvertebrates in reservoir systems. Moreover, the results of formative measurement models indicated a strong association between zooplankton and macroinvertebrates during the spring, whereas phytoplankton and macroinvertebrates exhibited a close association during the summer. The substantial concordance in density between phytoplankton and zooplankton revealed by the formative measurement models confirmed that assemblages with similar body sizes exhibit stronger concordance compared to those with significant differences in body size.
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Castro, DMP, RM Hughes, and M. Callisto. "Influence of peak flow changes on the macroinvertebrate drift downstream of a Brazilian hydroelectric dam." Brazilian Journal of Biology 73, no. 4 (November 2013): 775–82. http://dx.doi.org/10.1590/s1519-69842013000400013.
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Successive daily peak flows from hydropower plants can disrupt aquatic ecosystems and alter the composition and structure of macroinvertebrates downstream. We evaluated the influence of peak flow changes on macroinvertebrate drift downstream of a hydroelectric plant as a basis for determining ecological flows that might reduce the disturbance of aquatic biota. The aim of this study was to assess the influence of flow fluctuations on the seasonal and daily drift patterns of macroinvertebrates. We collected macroinvertebrates during fixed flow rates (323 m3.s–1 in the wet season and 111 m3.s–1 in the dry season) and when peak flows fluctuated (378 to 481 m3.s–1 in the wet season, and 109 to 173 m3.s–1 in the dry season) in 2010. We collected 31,924 organisms belonging to 46 taxa in the four sampling periods. Taxonomic composition and densities of drifting invertebrates differed between fixed and fluctuating flows, in both wet and dry seasons, but family richness varied insignificantly. We conclude that macroinvertebrate assemblages downstream of dams are influenced by daily peak flow fluctuations. When making environmental flow decisions for dams, it would be wise to consider drifting macroinvertebrates because they reflect ecological changes in downstream biological assemblages.
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Sánchez-Herrera, Marjorie Josefina, and Mylenda Avendaño-Sánchez. "Macroinvertebrados del norte de santander." Respuestas 10, no. 1 (June 16, 2016): 3–20. http://dx.doi.org/10.22463/0122820x.697.
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El presente artículo tiene como fin reportar las morfofamilias de macroinvertebrados capturadas e identificadas en diferentes puntos de las principales cuencas del departamento Norte de Santander: Pamplonita, Zulia, Algodonal y la Subcuenca del Táchira; contribuyendo al conocimiento de la biodiversidad acuática de la región.Palabras Clave: BMWP; Bioindicadores; Biodiversidad; Macroinvertebrados ABSTRACTThe aim of this paper is to report the morfofamilies of macroinvertebrates captured and identified in different points of the main basins of the rivers Pamplonita, Zulia, Algodonal and Táchira in the department of Norte de Santander, contributing to the knowledge of the aquatic biodiversity.Key words: BMWP, Bioindicators, Biodiversity, Macroinvertebrates.
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Mulat, Kebebush, and Antensay Mekoya. "Impact of Fine Sediment on Benthic Macroinvertebrates Communities of Freshwater Ecosystem: A Review." East African Journal of Forestry and Agroforestry 7, no. 1 (April 30, 2024): 146–74. http://dx.doi.org/10.37284/eajfa.7.1.1895.
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The freshwater environment in Ethiopia is exposed to severe human influence because of fast population growth and other factors. Anthropogenic activities in developing countries such as river regulation and pollution have a potentially negative cumulative impact on water quantity and quality of the rivers and wetlands, hence negatively impacting benthic invertebrates and fishes. This review aims to identify the impacts of fine sediment on the community of benthic macroinvertebrates, and freshwater food webs, and to assess the response of benthic invertebrates to fine sediment pollution. Literature review was used as a methodology. Fine segment load on the freshwater ecosystem from both point and nonpoint sources may directly/indirectly alter the macroinvertebrate communities. Organic and inorganic contaminants as well as other sediment variables (sediment grain size, total organic carbon, nutrients, etc.) were affecting the community composition of benthic invertebrates. However, habitat features like the number of supplements or the silt grain measure clarify the variation in macroinvertebrate indices and metrics. The impact of metals and, to a lesser extent, organic contaminants may also be significant. Benthic macroinvertebrates are commonly used indicators of river ecological conditions that can be adversely affected by fine sediment loads. Sedimentation can change the suitability of the substrate for some taxa, increase macroinvertebrate drift, and affect respiration and feeding. To conclude, excessive fine sediment severely alters the structure and function of macroinvertebrates. At the regional and national levels, different governmental and non-governmental organizations, research institutions, and policy makers are recommended to take responsibility for reducing sediment discharge to the freshwater ecosystem by applying different conservation measures of benthic macroinvertebrates.
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Turyahabwe, Remigio, Caroline Mulinya, Andrew Mulabbi, and Moses Olowo. "A Comparison of the Efficiency of Aquatic Macroinvertebrate Sampling Tools Used in Lotic Environmental Impact Assessment of Human Activities in A Tropical Mountain Stream in Eastern Uganda." Ghana Journal of Geography 14, no. 2 (August 11, 2022): 1–23. http://dx.doi.org/10.4314/gjg.v14i2.1.
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The study was aimed at comparing the efficiency of three macroinvertebrate sampling tools used in lotic environmental impact assessment of River Sipi including Surber sampler, rock-filled basket and Kick net sampling tools. The efficiency of the sampling tools was based on the data collected by each sampling tool, which was in turn used to calculate the Relative variation (RV) (efficiency), diversity, richness, and relative abundance, time taken to sort macroinvertebrate per sample and taxa assemblage. Data was analysed using a two-way ANOVA that was performed under the R Development Core Team 2010. The results indicated that despite the fact that all the sampling tools were efficient in sampling macroinvertebrates with RV<25%, both kick net and rock-filled basket obtained closely comparable efficiency results with Relative Variation ranging between 0.54-2% for the kick net and 1.4-3.6% for rock filled basket. Of the three sampling tools, the kick net was the most efficient, collecting a greater diversity of macroinvertebrate taxa (1.81±0.04) and a greater number of specimens (1444), abundance (66.4±0.25%), greater taxa richness (11±0.41) but required the biggest amount of time to sort macroinvertebrates (26±0.71minutes). In conclusion, the rock-filled basket served as the next best alternative efficient sampling tool to kick net in sampling macroinvertebrates.
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Pires, Mateus Marques, Carla Bender Kotzian, Marcia Regina Spies, and Vanessa dos Anjos Baptista. "Comparative assessment of aquatic macroinvertebrate diversity in irrigated rice fields and wetlands through different spatial scales: an additive partitioning approach." Marine and Freshwater Research 67, no. 3 (2016): 368. http://dx.doi.org/10.1071/mf14109.
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The role of rice fields as refuges for wetland macroinvertebrates was assessed at multiple spatial scales, and macroinvertebrate diversity was compared between fields and natural wetlands. Because irrigated rice fields are highly disturbed environments, and have lower environmental complexity and heterogeneity in the irrigated phase than do wetlands, we hypothesised that the fields would sustain lower diversity than do wetlands, especially at broader spatial scales. Wetlands and rice fields from three regions in southern Brazil were simultaneously sampled. In wetlands, the broadest scale (hydrographic basin) contributed the most to macroinvertebrate diversity. In rice fields, besides hydrographic basin level, narrower scales (site level) also contributed to macroinvertebrate γ diversity. Different cultivation and management systems may be responsible for the contribution of narrower scales to γ diversity in rice fields. Differences in community structure in both environments were determined by wetland drainage practices, and they were affected by the ENSO climatic phenomenon, which influenced macrophyte diversity in wetlands. Wetland communities were characterised by macrophyte-associated, passive-dispersing taxa, whereas rice fields contained short-lived, active-dispersing macroinvertebrates. The present study demonstrated that rice fields do not represent suitable refugia for wetland-expelled macroinvertebrates because they do not support similar community structure, at least under some management practices and climatic conditions influenced by ENSO.
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Pinna, Maurizio, Vojsava Gjoni, Fabio Bozzeda, Gabriele Marini, Giovanni Cristiano, and Antonio Di Sabatino. "How Do Sampling Methods Affect the Body Size–Abundance Relationships of Benthic Macroinvertebrates in Freshwater Ecosystems? A Comparative Analysis." Water 15, no. 3 (January 17, 2023): 386. http://dx.doi.org/10.3390/w15030386.
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Body size is a key trait of species, populations, and organisms; it relates to abundance, home range, metabolic rates, and stressors. As reported by Damuth’s law, the relationship between body size and abundance is negative with a slope value of −0.75. In aquatic ecosystems, particularly for benthic macroinvertebrates, the slope value deviates from the expected value of −0.75. This variation may depend on abiotic and biotic factors as well as methods that are used to sample benthic macroinvertebrates. “Leaf-bags” and “Surber-net” are the most used methods and they provide different data about the body size structures and abundance of the sampled benthic macroinvertebrates. Here, we used the slope of the body size–abundance relationships to compare the benthic macroinvertebrate assemblages sampled with two sampling methods (Leaf-bags and Surber-net). We found that Leaf-bags sampled a greater number of smaller taxa than Surber-net, which collected individuals of larger sizes. In our study, differences in the benthic macroinvertebrate body size structures collected with these two sampling methods were evident even if the experiment was performed at a limited spatio–temporal scale. Therefore, Leaf-bags and Surber-net should be used as complementary rather than alternative techniques since they sample integrated information from the benthic macroinvertebrate communities.
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Thaeraniza, Shafa Thasya, Oktiyas Muzaky Luthfi, and Andik Isdianto. "Macroinvertebrata Recruitments in Artificial Reef After Two Years of Sinking on The Damas Beach, Trenggalek." Journal of Marine and Coastal Science 9, no. 3 (September 30, 2020): 93. http://dx.doi.org/10.20473/jmcs.v9i3.22292.
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The condition of coral reefs in Damas Beach is included in the bad category because there are many fragments of coral reefs (rubble) caused by fishing nets caught in the reef. Based on the problem of coral reefs contained in the waters of Damas Beach, there are innovations to sink artificial reefs. The condition of artificial reefs that have been derived in the waters of Damas Beach within 2.5 years needs to be monitored to find out the macroinvertebrates that stick to the artificial reefs. Retrieval of macroinvertebrate data using the underwater photo transect method with the help of underwater cameras to produce observational data. The results found 10 types of macroinvertebrates with a total of 9,293 individuals. The composition of attached macroinvertebrates is dominated by barnacles by 66% and the density of macroinvertebrates is dominated by barnacles by 4.50 ind / m² out of a total density of 6.88 ind / m².
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Czarnecka, Magdalena, and Oliver Miler. "Decay processes in woody debris influence the taxonomic and functional composition of littoral macroinvertebrates." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 10 (October 2018): 1596–605. http://dx.doi.org/10.1139/cjfas-2017-0364.
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We examined the effects of woody debris decay state on the densities, taxonomic and functional composition, and diversity of macroinvertebrates in littoral zones of undeveloped lakes. Our study revealed that the interacting effects of increasing roughness and softness of the wood, as well as changes in the quality of food resources with progressing decomposition of woody debris, exerted the strongest impacts on macroinvertebrate communities. Structurally complex, decomposed wood supported higher densities and species richness of macroinvertebrates than undecayed wood. We also found several taxa that were typical for decayed wood, including macroinvertebrates considered as xylophages. Decaying wood underpinned greater functional richness than undecayed wood, with high densities of collector–gatherers and shredders that could benefit from organic matter originating from decomposing wooden tissue, as well as predators attracted by numerous potential prey inhabiting this complex habitat. As decaying wood enhanced abundant and diverse macroinvertebrate communities, which in turn could subsidize upper trophic levels, it provides a valuable habitat in littoral zones, particularly in lakes with already sparse macrophyte cover.
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Kędzior, Renata, Małgorzata Kłonowska-Olejnik, Elżbieta Dumnicka, Agnieszka Woś, Maciej Wyrębek, Leszek Książek, Jerzy Grela, Paweł Madej, and Tomasz Skalski. "Macroinvertebrate habitat requirements in rivers: overestimation of environmental flow calculations in incised rivers." Hydrology and Earth System Sciences 26, no. 15 (August 8, 2022): 4109–24. http://dx.doi.org/10.5194/hess-26-4109-2022.
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Abstract. Flow variability determines the conditions of river ecosystems and river ecological functioning. The variability of ecological processes in river ecosystems gradually decreases due to river channelization and incision. Prediction of the environmental flow allows us to keep biological diversity and river health developed as a response to the degradation of aquatic ecosystems overexploited by humans. The goal of the study was to test the influence of river incision on environmental flow estimation based on the Biological Monitoring Working Party (BMWP) macroinvertebrate index. A total of 240 macroinvertebrate assemblages of 12 waterbodies differing in bed substrate and amplitude of discharge were surveyed in southern Poland. Variations in the distribution of 151 466 macroinvertebrates belonging to 92 families were analysed. The similarity of benthic macroinvertebrates reflects the typological division of the rivers into three classes: Tatra mountain streams, mountain flysch rivers, and upland carbonate and silicate rivers. As a response variable reflecting the macroinvertebrate distribution in the river, the BMWP_PL index was chosen. The river incision significantly increased the values of e-flow calculations in relation to redeposited channels. The area of optimal habitat for macroinvertebrates decreased with the bed incision intensity. In highly incised rivers, the environmental flow values are close to the mean annual flow, suggesting that a high volume of water is needed to obtain good macroinvertebrate conditions. As a consequence, river downcutting processes and impoverishment of optimal habitats will proceed.
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P Ramollo, Phetole. "Impact of Alluvial Diamond Mining on Macroinvertebrate Community Structure in the Lower Vaal River, Northern Cape Province in South Africa." International Journal of Environment 9, no. 2 (October 27, 2020): 1–22. http://dx.doi.org/10.3126/ije.v9i2.32496.
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The study aimed to assess the impact of alluvial diamond mining on macroinvertebrate community composition at four selected sites in lower Vaal River in 2016 with the application of the South African Scoring System 5 (SASS5). Macroinvertebrates and physico-chemical water parameters such as pH, turbidity, electrical conductivity and dissolved oxygen were measured seasonally. Turbidity levels were high 5.98.0±0.63 NTU but never exceeded the water quality guidelines of aquaculture, whilst pH values did not vary much and were generally alkaline throughout the study. The macroinvertebrate community structure varied at all sites during the study period. Site 4 was the most impacted site dominated by the more tolerant macroinvertebrates such as Simuliidae, Baetidae and Gyrinidae. The study concludes that although alluvial diamond mining had a negative impact on macroinvertebrate community in the short-term period, they appeared to re-establish quickly once the mining operations stopped.
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Gómez-Aguirre, Ana M., Magnolia C. Longo-Sánchez, and Juan F. Blanco. "Macroinvertebrate assemblages in Gorgona Island streams: spatial patterns during two contrasting hydrologic periods." Actualidades Biológicas 31, no. 91 (November 26, 2012): 161–78. http://dx.doi.org/10.17533/udea.acbi.331496.
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Studies comparing various streams are scarce in tropical insular systems and inexistent in Colombia. In order to understand the spatial patterns of macroinvertebrates in tropical insular streams, and the environmental drivers of such patterns, we tested for patterns among streams but using a nested sampling design from streams to microhabitats in Gorgona Island (Colombia, Tropical Eastern Pacific) during two seasons (low and high precipitation). We found that benthic macroinvertebrate assemblages showed clear differences among streams despite of the variability within nested levels. Hydrologic disturbance tended to homogenize spatial patterns in most of the streams. Although ordinations of sampling units using either macroinvertebrate composition or environmental variables were not fully consistent, it was evident that water physicochemistry influenced by underlying geology was a pervasive driver of macroinvertebrate distribution. We highlight the importance of incorporating multiscale sampling designs for studying distributions of macroinvertebrates in tropical islands, and for biomonitoring.
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Shuman, Tyler C., Peter C. Smiley, Robert B. Gillespie, and Javier M. Gonzalez. "Influence of Physical and Chemical Characteristics of Sediment on Macroinvertebrate Communities in Agricultural Headwater Streams." Water 12, no. 11 (October 23, 2020): 2976. http://dx.doi.org/10.3390/w12112976.
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Agricultural land use leads to changes in physical and chemical characteristics of sediment that influence macroinvertebrate community diversity and abundance in streams. To the best of our knowledge the joint influence of sediment’s physical and chemical characteristics on stream macroinvertebrates has not been assessed. We measured sediment’s physical and chemical characteristics and sampled macroinvertebrates in eight agricultural headwater streams in Indiana, Michigan, and Ohio, United States, in 2017 and 2018 to determine the physical and chemical conditions of the sediment, to evaluate the relationships between physical and chemical characteristics of the sediment, and the relationship of macroinvertebrate communities with the sediment’s physical and chemical characteristics. Sediments within most sites were dominated by sand or silt. pH was suitable for macroinvertebrates and nitrate, herbicide, and trace metal concentrations were below concentration levels anticipated to affect macroinvertebrate survival. Linear mixed effect model analysis results indicated that a physical gradient of percent small gravel and percent silt was positively correlated (p < 0.05) with a chemical gradient of potassium concentrations, magnesium concentrations, and percent total nitrogen in the sediments. Our linear mixed effect model analysis results also indicated that Invertebrate Community Index scores were negatively correlated (p < 0.05) with a chemical gradient of simazine and calcium concentrations and were negatively correlated (p < 0.05) with physical gradient of grain size diversity and percent sand. Our results suggest that watershed management plans need to address physical and chemical degradation of sediment to improve macroinvertebrate biotic integrity within agricultural headwater streams in the Midwestern United States.
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Mohammed, Ibrahim, Ayalew Wondie, and Minwyelet Mengist. "The environmental quality and macroinvertebrate community structures of wetlands found in the Lake Tana Watershed, Ethiopia." Journal of the Cameroon Academy of Sciences 17, no. 3 (May 25, 2022): 183–203. http://dx.doi.org/10.4314/jcas.v17i3.1.
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The present study was conducted to assess the environmental quality status and macroinvertebrate community structures of wetlands using macroinvertebrates as bioindicators. A multimetric biotic index approach was used for the study. The findings revealed 3,367 macroinvertebrates belonging to 37 families. The percentages of Ephemeroptera, Odonata, and Tricoptera (%EOT), percent Diptera, percent filterercollectors, the ratio of Ephemeroptera, Plecoptera, and Trichoptera to Chironomid (EPT/C), the Biological Monitoring Working Party Score, and the Shannon–Wiener diversity index were all significantly related to human disturbance and could be used to assess water quality. Based on the macroinvertebrate index, human disturbance had a significant impact on Shesher wetland, a relatively lower impact on Avaji and Yitamot, and a moderate impact on Chimba, while Dena and Wonjeta had good habitat quality. Their water quality was very poor, poor, moderate, and very good, in that order. Farming, leather tanning, waste dumping, and effluent discharges were responsible for the poor habitat quality of impacted wetlands. Therefore, unless managed properly, human disturbance activities in the wetlands catchment were threatening macroinvertebrates and the wetlands ecosystem. Hence, implementation of catchment-based management together with continuous health status monitoring and a standalone wetland policy should be established.
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Nahli, A., F. E. Sghiouer, S. Oubraim, and M. Chlaida. "Structure and trophic organisation of the macrobenthic community of the Hassar stream after installation of the Mediouna wastewater treatment plant (Casablanca, Morocco)." IOP Conference Series: Earth and Environmental Science 1090, no. 1 (October 1, 2022): 012002. http://dx.doi.org/10.1088/1755-1315/1090/1/012002.
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Abstract The goal of this research is to assess changes in the structure of benthic macroinvertebrate Functional Feeding Groups (FFGs) in the Hassar Stream (north-east of Casablanca) after the Mediouna wastewater treatment plant (WWTP) was installed. Over the course of a year, from November 2013 to October 2014, data on water quality and macroinvertebrate fauna are gathered at seven sampling stations. To measure the resilience of FFGs, macroinvertebrates are used to analyse the influence of physicochemical water quality on their organisation. Based on FFGs abundance, Collector-gatherers make up 39.06 percent of the macroinvertebrates’ assemblage, followed by shredders (28.41 percent) and collector-filters (28.41 percent) (18.76 percent). Except for the upstream stations (S1 and S2), the FFGs ratios indicated that the environment is largely heterotrophic, has a significant relationship with riparian inputs, and generally stable substrates. These findings emphasise the necessity of researching macroinvertebrate FFGs as a supplement to measuring the ecological integrity and resilience of rivers after anthropogenic impact reduction.
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Lin, Qidong, Jinxi Song, Carlo Gualtieri, Dandong Cheng, Ping Su, Xinxin Wang, Jiaxu Fu, and Jianglin Peng. "Effect of Hyporheic Exchange on Macroinvertebrate Community in the Weihe River Basin, China." Water 12, no. 2 (February 8, 2020): 457. http://dx.doi.org/10.3390/w12020457.
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The effect of hyporheic exchange on macroinvertebrates is a significant topic in ecohydraulics. A field study was conducted during May and June 2017 to investigate the impacts of magnitude and patterns of hyporheic exchange on the sediment macroinvertebrate community in the Weihe River basin. The results demonstrate that upwelling flows cause resuspension of riverbed sediment, increasing the proportion of swimmer groups (such as Baetidae) in the macroinvertebrate community. However, large resuspension of river bed sediment results in a reduced abundance of macroinvertebrates. By controlling the transport processes of dissolved oxygen (DO), dissolved organic carbon (DOC), nutrients, temperature, and different patterns of hyporheic exchange strongly influence the structure of macroinvertebrate communities. Downwelling is more likely to produce rich invertebrate communities than upwelling. The magnitude for the hyporheic flux of 150–200 mm/d was optimal for the macroinvertebrate community in the Weihe River Basin. Above or below this rate results in a decline in community abundance and diversity. We suggest that research is conducted to better understand the effects of hyporheic exchange across bedforms on macroinvertebrate communities. The study supports any activities to preserve the ecological functions and health of rivers dominated by fine-grained sediments.
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Vasco, Anderson Nascimento do, Amanda Vaz de Souza Oliveira, Geovane Alves Feitosa, Talita Guimarães Araújo-Piovezan, Agripino Emanuel Oliveira Alves, and José Oliveira Dantas. "Impacts of dam construction on the macroinvertebrate community in the Poxin-Açú, in a tropical region." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 16, no. 6 (November 22, 2021): 1–11. http://dx.doi.org/10.4136/ambi-agua.2704.
Full textAbstract:
River regularization plays an important role in socio economic development. However, it also modifies the natural flow system of the river and its biotic and abiotic characteristics, causing significant impacts on rivers. To evaluate the impacts on the macroinvertebrate community caused by dam construction on the Poxim-Açú River, metrics of composition and community structure of the macroinvertebrates were analyzed, as well as ecological and biological traits of the region. Macroinvertebrates were collected at three sites located downstream the dam, before (2013) and after (2015) dam construction. The water quality was classified as “good” to “excellent” according to the biotics indices. The alterations of the flow regime of the river after the dam construction influenced the macroinvertebrate communities, modifying their diversity, equitability, richness, and the number of individuals.
Keywords: bioindicators, dam impacts, environmental monitoring.
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Turyahabwe, Remigio, Andrew Mulabbi, Joyfred Asaba, and Moses Olowo. "Ecological Responses of Macroinvertebrates to an In-Stream Ecosystem Restoration Technique in a Tropical Stream in Eastern Uganda." East African Journal of Environment and Natural Resources 3, no. 1 (September 1, 2021): 129–44. http://dx.doi.org/10.37284/eajenr.3.1.398.
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A field experiment was conducted to examine the ecological responses of macroinvertebrates to an in-stream ecosystem restoration technique called woody debris introduced in a stream in different arrangements to show how they (woody debris) affected the macroinvertebrate ecology, specifically assemblage composition and biometrics in River Nabongo. The experiment was carried out in two heterogeneous stream environments i.e., i) in a riffle found in the middle reaches of the river at a higher altitude and ii) a pool in the lower altitude and reaches of the river. Each of these two treatments had a control plot for comparison purposes. Four macroinvertebrate sampling campaigns were launched in experimental sites from September 2019 to April 2021. All restoration structures had more macroinvertebrates than control and pre-treatment sites. The introduction of simple structures at the riffle site led to an increase in collector-filterers from 9-128 individuals, while at the pool site all the structures increased macroinvertebrates by 1151 individuals. Taxon richness was highest in the complex plot with 14±0.41 which significantly differed from the rest of the sampling plots at P<0.05. The relative abundance of taxa at the pool site varied significantly from one sampling plot to another at P<0.05 with the highest mean abundance registered in complex and simple structures having 61.3±0.10 and 23.5±0.11 respectively. It was concluded that complex woody debris structures increase the diversity, abundance and richness of aquatic macroinvertebrates by providing hard substrates for colonization by algae and microorganisms on which macroinvertebrates feed. We recommended that other researchers should study the impact of other in-stream ecosystem restoration techniques such as floating islands, constructed wetlands, D-deflectors, a comparison of which with restored woody debris will enable ecologists to choose the most suitable technique to apply at different stream points.
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Andem, Andem Bassey, Christopher Ogamode Odey, Solomon B. Beshel, Opeyemi Babasegun Ojo, and Marvellous Christopher Etuk. "Human-Induced Impact on the Distribution and Diversity of Benthic Macroinvertebrates and Fish Fauna in the Tropical Ikang River, Nigeria." Croatian Journal of Fisheries 81, no. 1 (March 1, 2023): 1–12. http://dx.doi.org/10.2478/cjf-2023-0001.
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Abstract South-eastern Nigeria’s tropical water ecosystems typically consist of mangrove swamps and riparian forests, both of which have become endangered in the last six decades. The purpose of this research was to determine the extent of human-induced impact and activities on the effect of water quality on the distribution and diversity of benthic macroinvertebrates and fish fauna in the Tropical River (Ikang). The river’s surface water, benthic macroinvertebrates, and fish fauna were sampled and identified to create a database of reference information. Twelve (12) species of benthic macroinvertebrates from two (2) phyla were identified. Station 1 had the highest benthic macroinvertebrate abundance of 58 (35.65%), while Station 3 had the lowest abundance of 52 (31.70%). Uca tangeri was the most abundant benthic macroinvertebrate with a percentage abundance of 28 (17.07%), while Dinocras sp., Macromia sp., and Gomphus sp. were the least abundant benthic macroinvertebrates with a percentage abundance of 3.66%. In addition, seven (7) fish species from six (6) families were identified. During the study, the family Claroteidae was the most abundant, while the family Carangidae was the least abundant. The temperature of the river had a positive correlation with the families Carangidae and Mugilidae, a negative correlation with the family Clupeidae, and no correlation with the family Claroteidae. Total dissolved solids (TDS) correlated positively with the families Carangidae, Mugilidae, and Clariidae, while conductivity correlated positively only with the family Sciaenidae and negatively with the families Carangidae, Mugilidae and Clariidae. The abundance and diversity of benthic macroinvertebrates and fish fauna were generally influenced by the physical and chemical characteristics of the water, the availability of food, and the extent of human impacts and activities. In order to ensure sustainable water quality and biodiversity conservation in our environment, it is necessary to manage the river and the surrounding ecosystem appropriately.
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Grygoruk, Mateusz, Ewelina Szałkiewicz, Maria Grodzka-Łukaszewska, Dorota Mirosław-Świątek, Paweł Oglęcki, Dorota Pusłowska-Tyszewska, Grzegorz Sinicyn, and Tomasz Okruszko. "Revealing the influence of hyporheic water exchange on the composition and abundance of bottom-dwelling macroinvertebrates in a temperate lowland river." Knowledge & Management of Aquatic Ecosystems, no. 422 (2021): 37. http://dx.doi.org/10.1051/kmae/2021036.
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We studied distributions and abundances of macroinvertebrates in relation to hyporheic water exchange (HWE) patterns of the upper Biebrza − a small, lowland, low dynamic European river located in Northeast Poland. On a 6-km stretch of the river; we determined the variability of water exchange in the hyporheic zone by using direct field measurements of the pressure gradient to determine groundwater–surface water interactions. We identified locations with upwelling and downwelling fluxes of HWE as well as ambiguous hydraulic contact between groundwater and surface water along the river. In these locations, we sampled bottom-dwelling macroinvertebrates. In total, 627 individuals of benthic macroinvertebrates of 34 taxa were identified. We revealed that bottom-dwelling macroinvertebrate fauna is more abundant and diverse in river stretches where water from the river infiltrates the hyporheic zone. Results also show higher taxonomic richness and abundances of benthic macroinvertebrates in stretches with diagnosed infiltrating conditions (downwelling flux in a hyporheic zone) compared to in stretches where the river drained groundwater (upwelling flux in a hyporheic zone), but the recorded differences were not statistically significant.
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Tarkowska-Kukuryk, Monika. "Environmental Drivers of Macroinvertebrate Assemblages within Peat Pool Habitat-Implication for Bioassessment." Water 13, no. 17 (August 28, 2021): 2369. http://dx.doi.org/10.3390/w13172369.
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Macroinvertebrates are a crucial component of wetland trophic webs. Many taxa are used as bioindicators of ecosystem change. However, relationships between macroinvertebrates and the environmental factors in peat pool habitats are still not well recognized. The present study shows the results of long-term studies during the years 2010–2020, on the responses of macroinvertebrates to the changes of environmental variables in a peat pool habitat formed as a result of peat exploitation on continental raised bog. The RDA analysis significantly explained 87.3% of the variance in macroinvertebrates abundances. Assemblages of most taxa (Anisoptera, Chironomidae, Ceratopogonidae, Coleoptera, Hydrachnidia and Tabanidae) showed a strong relationship with N-NO3 and pH. Moreover, densities of Chaoboridae larvae were explained by chlorophyll-a concentrations. Dominant taxon, Chironomidae, constituted from 48% to 87% of total faunal density. The highest proportions showed larvae of Psectrocladius sp. (gr. sordidellus) and Chironomus sp. Changes in the composition of macroinvertebrate fauna over a period of 10 years reflect the eutrophication process of the peat pool and deterioration of habitat conditions.
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Silva, CV, and R. Henry. "Aquatic macroinvertebrates associated with Eichhornia azurea (Swartz) Kunth and relationships with abiotic factors in marginal lentic ecosystems (São Paulo, Brazil)." Brazilian Journal of Biology 73, no. 1 (February 2013): 149–62. http://dx.doi.org/10.1590/s1519-69842013000100016.
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Marginal lakes are characterised by their having high biological diversity due to the presence of aquatic macrophytes in their coastal zones, providing habitats for refuge and food for animal community members. Among the fauna components associated with macrophytes, aquatic macroinvertebrates are important because they are an energy source for predators and fish. In six lakes and two different seasons (March and August 2009), the ecological attributes of aquatic macroinvertebrate community associated with Eichhornia azurea were compared and the controlling environmental factors were identified. Since the attributes of macroinvertebrate community are strictly associated with abiotic variables of each distinct habitat, our hypothesis was that each site associated with the same floating aquatic macrophyte (E. azurea) should have a typical composition and density of organisms. We identified 50 taxa of macroinvertebrates, with greater taxa richness for aquatic insects (37 taxa) divided into eight orders; the order Diptera being the most abundant in the two study periods. On the other hand, higher values of total taxa richness were recorded in August. Dissolved oxygen and pH presented the greatest number of significant positive correlations with the different taxa. The animals most frequently collected in the six lakes in March and August 2009 were Hirudinea, Oligochaeta, Hydrachnidae, Conchostraca, Ostracoda, Noteridae, Ceratopogonidae, Chironomidae, Culicidae, Caenidae, Pleidae, Aeshnidae, Libellulidae, Coenagrionidae and Nematoda. Only densities of Trichoptera, Ostracoda and Conchostraca presented the highest significant differences between lakes in both study periods and considering the composition of macroinvertebrates no significant differences were registered for macroinvertebrate composition.
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Edosa, Omoregie, and S. Ngatajosi. "Macroinvertebrate diversity in a Subtropical High-Pressure Zone (SHPZ) man-made lake: Goreangab Dam, Windhoek, Namibia." Namibian Journal for Research, Science and Technology 3, no. 2 (December 16, 2021): 81–90. http://dx.doi.org/10.54421/njrst.v3i2.43.
Full textAbstract:
This research investigated the diversity and distribution of macroinvertebrate assemblages of a sub-tropical high-pressure belt man-made lake, the Goreangab Dam, in Windhoek, Namibia in order to develop a respective index of biotic integrity as a baseline of determining and monitoring the health status of the dam. Macroinvertebrates samples were collected biweekly, over a period of two months (August and September 2019) from 8 stations along the bank of the dam. Collected macroinvertebrate samples were sorted live, counted and identified to the lowest taxonomic level possible. The Shannon Weiner index (H'), Simpson’s index (D) and Pielou Evenness index (J’) were used in analysing macroinvertebrates diversity. A total of nine different macroinvertebrate species belonging to different orders were recorded during the sampling period. Chironomus plusmosus (larvae), had the highest composition (19%) and Arctocorisa arguta with the lowest composition (6%). Anthropogenic activities have a huge impact on the distributions of the macroinvertebrate assemblages according to the tolerance of water pollution. The fact that the Chironomus plusmosus (larvae) are the highest in composition shows that the waterbody is unhealthy and at this stage only supports the life of species that are tolerant to water pollution.
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Culp, Joseph M., and Ronald W. Davies. "Responses of Benthic Macroinvertebrate Species to Manipulation of Interstitial Detritus in Carnation Creek, British Columbia." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 1 (January 1, 1985): 139–46. http://dx.doi.org/10.1139/f85-017.
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Experimental manipulations were conducted in Carnation Creek, British Columbia, to determine the response of macroinvertebrate distribution and abundance to differences in detritus source and quantity. Four treatments (no detritus, low hemlock (Tsuga heterophylla), low alder (Alnus rubra), high alder) with a standardized substrate were established in a riffle and left for 28 d. Densities and/or biomasses of 12 of the 20 colonizing macroinvertebrate taxa were significantly different among the detritus treatments. Microbial activity, detritus processing, and macroinvertebrate abundances were highest in substrate patches with alder detritus. Compared with the no detritus and low hemlock treatments, the low alder treatment increased the abundances of nine taxa and decreased three taxa, while the high alder treatment increased the abundances of six taxa and decreased six taxa. Thus, detritus source and quantity strongly influenced macroinvertebrate community composition within the streambed. Although most of the macroinvertebrates in all treatments were either collector–gatherer or shredder detritivores, these macroinvertebrates responded to changes in detritus in a species-specific manner. Therefore, the Carnation Creek experiments emphasize the importance of interstitial detritus in the substrate as a factor that influences the microdistribution of the benthos at the species, rather than trophic feeding, assemblage level.
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Elias, Carmen L., Ana Raquel Calapez, Salomé F. P. Almeida, and Maria João Feio. "From perennial to temporary streams: an extreme drought as a driving force of freshwater communities." Marine and Freshwater Research 66, no. 5 (2015): 469. http://dx.doi.org/10.1071/mf13312.
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Alterations in trait proportions of diatom and aquatic macroinvertebrate communities were used to evaluate the consequences of the drying of temperate perennial streams due to an uncommon drought event. Four Atlantic-temperate Portuguese streams were sampled on three occasions; spring before the drought, 2 weeks after the return of water to the streambed, and spring after the drought. The traits from diatom and macroinvertebrate communities from temperate streams were also compared with those from Mediterranean systems to assess possible shifts in traits. The effects from stream drying were long-lasting for macroinvertebrates; however, only the diatom trait proportions shifted towards proportions similar to those occurring in Mediterranean streams. There was a significant reduction of macroinvertebrates with the ability to produce cocoons, to disperse actively by flight and passively disperse in the water and of swimmers following the return of water. A decrease in stalked species immediately after drought was evident in diatom communities. In contrast to temperate communities, Mediterranean ones were characterised by larger and less mobile diatoms, and smaller-bodied macroinvertebrates with shorter life cycles. Additional studies are required to determine the long-term effect of uncharacteristic drought events on biological traits and their ecosystem functions in typically perennial streams.
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Han, Gwan Hee, Sang Lyeol Kim, Su Min Kang, Hyung-Gon Lee, and Ok Hwan Yu. "Attached Macroinvertebrates Inhabiting Marine Plastic Debris from the Beach and Port Areas of the Southern Sea of Korea." Journal of Marine Science and Engineering 11, no. 2 (January 19, 2023): 252. http://dx.doi.org/10.3390/jmse11020252.
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The increasing amount of marine plastic debris (MPD) poses risks of ingestion, entanglement, and transport of alien species. A new ecosystem called the “plastisphere” is currently being studied, but relevant research on it is limited. In this study, we analyzed the frequency of appearance of macroinvertebrate species on MPD. Macroinvertebrates attached to MPD were collected once every three months from March to December 2021 in eight regions. MPD in the form of aquaculture and fishing gear was detected most frequently during the study. In total, two phyla, 14 orders, 19 families, and 41 species of attached macroinvertebrates were detected during the study. There were more attached macroinvertebrate species, and they were more frequent, on fishing/aquaculture MPD (sea origin) than packaging MPD (land origin). Most fishing/aquaculture MPD is made of softer or rougher materials than packaging MPD and has a longer exposure time in the sea. In particular, the alien species Mytilus galloprovincialis was found on all longer-exposure MPD. These findings suggest that the macroinvertebrates attached to MPD are affected by the duration of exposure to the water and the characteristics of the MPD material. Therefore, in the future, fishing/aquaculture MPD could be used as an indicator for monitoring MPD-attached organisms.
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Lim, Sung‐ho, and Yuno Do. "Macroinvertebrate conservation in river ecosystems: Challenges, restoration strategies, and integrated management approaches." Entomological Research 53, no. 8 (August 2023): 271–90. http://dx.doi.org/10.1111/1748-5967.12665.
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AbstractRiver ecosystems face growing threats from human‐induced stressors, resulting in habitat degradation and biodiversity loss. Crucial to these ecosystems, macroinvertebrates maintain river health and functioning. In this review, we examine the challenges confronting macroinvertebrates, explore restoration strategies and management approaches, and shed light on knowledge gaps and future research directions. Habitat degradation, water pollution, climate change, and invasive species are discussed as key challenges. Various restoration strategies, such as in‐stream habitat restoration, flow regime restoration, riparian zone restoration, and connectivity restoration, are evaluated for macroinvertebrate conservation. Integrated catchment management, adaptive management, community‐based management, monitoring, and policy integration are highlighted as essential management approaches, and knowledge gaps in long‐term monitoring, innovative restoration techniques, climate change resilience, and policy incorporation are identified as areas calling for further research. Ultimately, a proactive, adaptable, and cooperative approach to river management will ensure macroinvertebrate conservation and sustainable river ecosystems.
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Mutshekwa, Thendo, Ross N. Cuthbert, Ryan J. Wasserman, Florence M. Murungweni, and Tatenda Dalu. "Macroinvertebrate colonisation associated with native and invasive leaf litter decomposition." Knowledge & Management of Aquatic Ecosystems, no. 421 (2020): 32. http://dx.doi.org/10.1051/kmae/2020025.
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Lake and reservoir ecosystems are regarded as heterotrophic detritus-based habitats which are dependent on both autochthonous and allochthonous organic matter for the majority of energy inputs. In particular, allochthonous detritus is in particular important for the trophic dynamics of microbial organisms, macroinvertebrates and benthic plants in freshwaters. Here, we assess macroinvertebrate colonisation, and quantify decomposition rates, of leaf litter from species of native and invasive plants in a small agricultural reservoir. Native fig Ficus sycomorus and silver cluster–leaf Terminalia sericea were compared to invasive tickberry Lantana camara and guava Psidium guajava, whereby macroinvertebrate colonisation was assessed over time. Leaf treatments had a significant, group-specific effect on abundances and composition among focal macroinvertebrates. Invasive leaves reduced Physidae and Oligochaeta abundances, yet Ostracoda were significantly more abundant in the presence of invasive P. guajava. Chironomidae relative abundances increased under invasive L. camara treatments, whilst differences among leaf treatment effects on Coenogrionidae abundances were not statistically clear. In turn, macroinvertebrate diversity did not differ significantly among plant treatment groups. The decomposition rate of the leaf litter demonstrated differences among the species, following a decreasing order of L. camara > F. sycomorus > T. sericea > P. guajava. The study results highlight that leaf litter species identity among invasive and native plants plays an important role in the colonisation of macroinvertebrates in small reservoirs, thereby differentially supporting aquatic environments and food webs. However, differences were not uniform across invader-native groupings. Nonetheless, certain invasive leaf litter decomposes faster than native litter, with possible implications for broader nutrient dynamics and subsequent community composition.
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Ntloko, Phindiwe, Carolyn G. Palmer, Frank C. Akamagwuna, and Oghenekaro N. Odume. "Exploring Macroinvertebrates Ecological Preferences and Trait-Based Indicators of Suspended Fine Sediment Effects in the Tsitsa River and Its Tributaries, Eastern Cape, South Africa." Water 13, no. 6 (March 15, 2021): 798. http://dx.doi.org/10.3390/w13060798.
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The taxonomy-based response pattern of macroinvertebrates to sediment stress is well established, with tolerant taxa increasing in impacted conditions, while sensitive taxa decrease along a deteriorating water quality gradient. However, the distribution patterns of traits in response to environmental stress gradient, including suspended sediments, remain unclear, particularly in Africa, where trait-based studies are under-explored. We examined the distribution patterns of macroinvertebrate traits along a suspended sediment stress gradient and identified tolerant and sensitive traits for suspended sediment stress. We sampled macroinvertebrates and environmental variables seasonally in winter, spring, summer and autumn of 2016 to 2018 in eight selected sites in the Tsitsa River and its tributaries. We selected 12 traits and ecological preferences, resolved them into 47 trait attributes, and analysed them using the RLQ and fourth-corner analyses. Our results revealed that macroinvertebrate traits and ecological preferences were differentially influenced by fine suspended sediments in the Tsitsa River and its tributaries. Traits such as a preference for CPOM, collector-filtering, and a high sensitivity to oxygen depletion, were deemed sensitive to suspended sediments stress, exhibiting positive associations with the control sites, and negatively associated with any of the environmental parameters (sediment grain sizes, turbidity, TSS and EC). Tolerant indicator traits included a high tolerance of oxygen depletion, skating and a preference for FPOM. The fourth-corner analysis results indicated that suspended fine sediment grain sizes, (including coarse sand, fine silt and clay) were the most important variables influencing macroinvertebrate trait distribution patterns during the dry season, while gravel, mud and medium sand were more important during the wet season. Overall, our study provided critical insights towards trait-based responses of macroinvertebrates communities to suspended sediment stress, key information that could stimulate the development of macroinvertebrate trait-based biomonitoring tools for the assessment of suspended sediment stress in the Afrotropical region.
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Jyväsjärvi, Jussi, Marko Järvinen, and Heikki Hämäläinen. "Spatial community concordance of summer phytoplankton and profundal macroinvertebrates in boreal lakes." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 12 (December 2014): 1776–83. http://dx.doi.org/10.1139/cjfas-2014-0135.
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Reliance of profundal benthic macroinvertebrate assemblages on epilimnetic algal production — a key element of pelagic–benthic coupling — is a well-recognized phenomenon in the literature but the details are still poorly understood. In particular, the importance of taxonomic composition of algal communities and associated qualitative aspects of the settling material to benthic invertebrates is poorly known. We addressed this issue by investigating concordance of summer phytoplankton and profundal macroinvertebrate community composition using data from 47 boreal lakes. We examined community variation and environmental correlates of phytoplankton and macroinvertebrates with nonmetric multidimensional scaling ordinations. We also used cluster analysis to group sites according to their macroinvertebrate assemblages and evaluated the differences in phytoplankton composition and class-specific relative abundance among the clusters. Community concordance was evaluated with Procrustes rotation and partial Mantel tests, using oxygen concentration and phytoplankton biomass — the main drivers of macroinvertebrate community structure — as controlling factors. Procrustes and Mantel tests suggested congruence between macroinvertebrate and summer phytoplankton community composition. The concordance remained significant even after controlling for oxygen and biomass, by partial Mantel tests, suggesting a unique effect of phytoplankton species composition on macroinvertebrate assemblages. The four groups of lakes clustered by their macroinvertebrate assemblages also differed significantly in their phytoplankton taxa composition, and there were among-cluster differences in relative abundance of the seven most abundant phytoplankton classes. Our findings of community concordance of phytoplankton and profundal macroinvertebrates suggest a functional dependency of these two components, but further studies are needed to verify the actual causal mechanisms.
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Corbi, Juliano José, and Susana Trivinho-Strixino. "Relationship between sugar cane cultivation and stream macroinvertebrate communities." Brazilian Archives of Biology and Technology 51, no. 4 (August 2008): 569–79. http://dx.doi.org/10.1590/s1516-89132008000400015.
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The aim of this work was to study the influence of the sugar cane cultivation on the macroinvertebrate communities of 11 streams under different land uses. Analysis of the sediment (organic matter contents and metals) and water complemented the study. Ninety six macroinvertebrates taxa were identified, of which 54 were Chironomidae and 42 of other aquatic macroinvertebrates. The streams located in the areas of sugar cane culture and pasture presented low taxa and a great participation of Chironomidae (78% of the total). In contrast, the streams located in the areas with riparian vegetation presented a rich aquatic fauna with less participation of Chironomidae (60% of the total).
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Zúñiga-Céspedes, Bladimir, María Del Carmen Zúñiga, and Julián Chará. "Evaluating the effect of macroinvertebrate exclusion on leaf breakdown rates in two upland Colombian streams." Revista de Biología Tropical 66, no. 1 (December 13, 2017): 457. http://dx.doi.org/10.15517/rbt.v66i1.28070.
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Macroinvertebrate shredders have been widely recognized as an important functional feeding group that contributes to leaf decomposition in temperate streams, but little is known about their role in upland Neotropical streams. In this study, we investigated the effect of macroinvertebrate exclusion on leaf breakdown rates in two upland streams (Marianela and Peña Bonita with 1 911 and 2 560 m elevation, respectively) in Colombia. We hypothesized that leaf litter breakdown is mediated mainly by macroinvertebrate shredders in Colombian upland streams. The study was carried out between January and April of 2009, including the dry season and the beginning of the wet season. We measured leaf mass loss using coarse- (15 mm; accessible to macroinvertebrates) and fine- (200 µm; macroinvertebrates excluded) mesh litter bags that were anchored with wood stakes to the bottom of each stream and recovered after 7, 14, 21, 28, and 56 days. We selected leaves from two dominant plant species and used three leaf treatments: two single species (Palicourea cuatrecasasii and Critoniopsis ursicola) and mixed-species (P. cuatrecasasii and C. ursicola). We compared leaf breakdown rates between the Peña Bonita and Marianela stream, mesh-sizes, and leaf treatments. Macroinvertebrates that colonized the litter bags were measured for density and biomass and categorized in functional feeding groups. In general, there were no significant differences in breakdown rates between the streams and the mesh-sizes. In contrast, leaf breakdown rates had significant differences between all leaf species, where C. ursicola had higher breakdown rates than mixed-species, and P. cuatrecasasii. Macroinvertebrate exclusion did not affect leaf breakdown rates and their assemblages were composed by high densities of collectors (mainly Chironomidae) and few shredders with a large body size. The similar macroinvertebrate colonization between leaf species, the relatively slow breakdown rates, and the shredder scarcity, suggest that leaves were a refractory substrate. Further studies should include leaf species with different nutritional qualities and larger spatial-temporal scales to test the hypothesis of shredder presence and its role on leaf decomposition in upland Colombian streams.
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Fabricius, K. E., G. De'ath, S. Noonan, and S. Uthicke. "Ecological effects of ocean acidification and habitat complexity on reef-associated macroinvertebrate communities." Proceedings of the Royal Society B: Biological Sciences 281, no. 1775 (January 22, 2014): 20132479. http://dx.doi.org/10.1098/rspb.2013.2479.
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The ecological effects of ocean acidification (OA) from rising atmospheric carbon dioxide (CO 2 ) on benthic marine communities are largely unknown. We investigated in situ the consequences of long-term exposure to high CO 2 on coral-reef-associated macroinvertebrate communities around three shallow volcanic CO 2 seeps in Papua New Guinea. The densities of many groups and the number of taxa (classes and phyla) of macroinvertebrates were significantly reduced at elevated CO 2 (425–1100 µatm) compared with control sites. However, sensitivities of some groups, including decapod crustaceans, ascidians and several echinoderms, contrasted with predictions of their physiological CO 2 tolerances derived from laboratory experiments. High CO 2 reduced the availability of structurally complex corals that are essential refugia for many reef-associated macroinvertebrates. This loss of habitat complexity was also associated with losses in many macroinvertebrate groups, especially predation-prone mobile taxa, including crustaceans and crinoids. The transition from living to dead coral as substratum and habitat further altered macroinvertebrate communities, with far more taxa losing than gaining in numbers. Our study shows that indirect ecological effects of OA (reduced habitat complexity) will complement its direct physiological effects and together with the loss of coral cover through climate change will severely affect macroinvertebrate communities in coral reefs.
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Ertaş, Alperen, and Bülent Yorulmaz. "Assessing water quality in the Kelebek Stream branch (Gediz River Basin, West Anatolia of Turkey) using physicochemical and macroinvertebrate-based indices." Aquatic Research 4, no. 3 (2021): 260–78. http://dx.doi.org/10.3153/ar21020.
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This study was carried out in Kelebek, which is the most important stream in Gediz River Basin, Turkey, to determine water quality by using macroinvertebrate-based metrics and physicochemial variables. In addition, we also aimed to investigate the effects of anthropogenic pressure and dam construction on stream macroinvertebrates during the study period. In this study, following biotic indices are used: Saprobi Index (SI), Biological Monitoring Working Party (BMWP), Average Score per Taxon (ASPT), Family Biotic Index (FBI), Belgian Biotic Index (BBI), as well as diversity indices: Shannon-Weaver index (SWDI), Simpsons index (SDI) and Margalef index (MDI). Collection of macroinvertebrate samples and the physicochemical measurements were carried out monthly for a year. As a result of the identification, the most dominant macroinverterate group was Insecta. Our results show the presence of 9 taxonomic group in the stream which belong to nine groups: Oligochaeta, Mollusca, Crustacea, Ephemeroptera, Plecoptera, Trichoptera, Odonata, Coleoptera, Diptera. Canonical correlation analysis (CCA) indicates importance of physicochemial variables in the distribution of different macroinvertebrates groups (total variance 88%), species (total variance 86.2%) and biotic indices (total variance 88.2%). The water quality along the Kelebek Stream show variation from good class in station #1, #2 and #5, to moderate in station #3 and #4. We conclude that BMWP (Original), BMWP (Spanish), BMWP (Greek) and ASPT indices are suitable for assessing stream health by macroinvertebrates.
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Wu, Feifei, Yanting Zou, Shan Qin, Feilong Li, and Yuan Zhang. "eDNA Biomonitoring of Macroinvertebrate Communities for the Bioassessment of a River’s Ecological Status." Water 15, no. 2 (January 11, 2023): 308. http://dx.doi.org/10.3390/w15020308.
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Environmental DNA (eDNA) becomes a promising technology for macroinvertebrate monitoring worldwide. In recent decades, with increasing humanization processes, such as water pollution and habitat fragmentation, the richness and abundance of macroinvertebrates show a dramatic decline, which is particularly evident in tropical or subtropical rivers. The high-throughput and rapid monitoring of species’ survival and the ecological status of their habitats are relevant to river management. Here, we used the eDNA technology to detect macroinvertebrates in the Dongjiang River—a typical subtropical river in Southern China, to assess the ecological status, based on eDNA datasets. Our data showed a total of 640 OTUs detected by eDNA technology, belonging to three phyla, five classes, 13 orders, 33 families and 71 genera of macroinvertebrates, and these taxa had a 36.6% coverage rate with historical data at the genus level. The traditional water quality index (WQI) showed that the upstream of Dongjiang River were mainly levels I~II, the middle stream were levels II~III, and the downstream were levels IV~V. The eDNA-based biotic indices showed almost the same findings, that is, the overall ecological status of Dongjiang River was: upstream > middle reaches > downstream. Overall, this study provides important datasets and technical support for eDNA technology in macroinvertebrate monitoring and ecosystem management in the subtropical rivers.
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Eviota, Manny P., Louella S. Degamon, Rosalia L. Hugo, Roselle E. Bertulfo, Medielyn M. Odtojan, Gheleene S. Buenaflor, and Jerry T. Cuadrado. "Diversity of Macroinvertebrates in the Mangrove Forest of Brgy. Nabago, Surigao City, Philippines." IOP Conference Series: Earth and Environmental Science 1250, no. 1 (October 1, 2023): 012021. http://dx.doi.org/10.1088/1755-1315/1250/1/012021.
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Abstract Macroinvertebrate assemblages in the mangrove forest were assessed to determine the baseline information on the marine ecosystem in Barangay Nabago. Physicochemical parameters of soil and water were also determined to correlate with these bio-indicators. Three sampling stations were established. Live specimens were collected from natural substrates such as rocks, leaves, wood, and other debris through hand picking. To obtain macrobenthos, soil samples were collected using a core method with six-core samples from each plot. A 500 micrometer (0.5 mm) mesh size sieve was used to separate the macroinvertebrates from the sediments and any debris. A multiparameter checker determined the physicochemical parameters of water such as dissolved oxygen, pH, temperature, total dissolved solids, and conductivity. Biodiversity indices such as species richness, abundance, density, Shannon-Weiner diversity index, and evenness were calculated using the Paleontological Statistical Software Package (PAST) version 3.20 with correlation analysis using Canonical Correspondence Analysis (CCA). Station 3 obtained the highest frequency count of macroinvertebrates compared to the first (1) and second (2) stations, which correlate to the highest numerical value of the physicochemical parameters such as dissolved oxygen (DO), conductivity, and pH. These physicochemical parameters were favourable for macroinvertebrate species to thrive. Soil characterized with the highest percentage of the sandy substrate also contributed to macroinvertebrates’ diversity, particularly in station 3, which obtained the highest diversity index (H’=2.436).
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Mazebedi, Richard, and Thomas Hesselberg. "A preliminary survey of the abundance, diversity and distribution of terrestrial macroinvertebrates of Gcwihaba cave, northwest Botswana." Subterranean Biology 35 (July 2, 2020): 49–63. http://dx.doi.org/10.3897/subtbiol.35.51445.
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Inventories of cave species and in-depth understanding of cave ecosystems are essential for informing conservation approaches for the unique and vulnerable cave fauna. Gcwihaba cave is the largest cave in Botswana but its ecology is poorly understood. This study set out to provide the first quantitative survey of the cave’s terrestrial macroinvertebrates. Macroinvertebrates were collected from sample sites at 10 m intervals into the cave from the cave entrance. At each site, macroinvertebrates on the cave floor were collected by quadrat sampling while macroinvertebrate from cave walls were collected by visual opportunistic searches. Moisture content, pH and electrical conductivity of the cave floor substrate were measured at each site to examine the influence of the floor properties on the distribution of macroinvertebrates on the cave floor. Twelve species in 10 families and 8 orders of terrestrial macroinvertebrates were collected. The occurrence of taxa varied across the sites, with most taxa occurring in the light and twilight sectors of the cave (within 30 m), whereas the dark sector (beyond 30 m) was dominated by cave cockroaches (Gyna sp.). The abundance of the cave cockroaches, darkling beetles (Tenebrionidae, Tenebrio sp.) and cave wasps (Sphecidae) positively correlated with floor substrate of high moisture content and high electrical conductivity, which became increasingly common with distance into the cave. The abundance of other taxa from the cave floor positively correlated with a floor substrate of high pH and low moisture, which was common near the cave entrance.
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Camacho-Reyes, Jairo A., and Claudia P. Camacho-Rozo. "Aspectos sobre la historia natural de macroinvertebrados en esteros semipermanentes de la altillanura en el departamento de Casanare." Orinoquia 14, no. 2 sup (September 1, 2010): 71–82. http://dx.doi.org/10.22579/20112629.92.
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Titulo en ingles: Aspects of the natural history of macroinvertebrates in the high plains semi-permanent wetlands in the Department of Casanare.RESUMEN: Se realiza aportes al conocimiento sobre los ciclos vitales de los macroinvertebrados y se caracterizan sus microhábitats, en tres cuerpos de agua semipermanentes en sabana inundable y de desborde en la altillanura del municipio de Yopal-Casanare (Esteros San Martín (SM), el Trompillo (T) y la Ilusión (LI): 05° 21' 31''N 072º 13' 16''W; ubicados a 214 m.s.n.m.). Resultado del análisis cualitativo del material colectado en muestreos multianuales (1998, 1999, 2002 y 2008) en tres (I, II y III) épocas diferentes de lluvias en los meses de mayo a diciembre, se registraron 19 familias con 29 morfoespecies (24 sp SM, 20 T, 18 LI) para la etapa I; 28 familias y 47 morfoespecies (35 SM, 27 T, 32 LI) en la etapa II y 35 familias, 57 morfoespecies (52 SM, 40 T, 35 LI) en la III. Las comunidades de macroinvertebrados en estos ecosistemas evidencian varias etapas del ciclo vital: adultos; adultos y larvas; adultos, larvas y pupas; larvas y pupas; larvas. El Estero San Martin registro la mayor diversidad de especies seguido por el Trompillo y la Ilusión. El Estero San Martín presentó la mayor diversidad en el mes de diciembre, seguido de julio y el menor registro se obtuvo en mayo, época que coincide con el inicio de inundación de las sabanas.En estos ambientes de la llanura y la altillanura de la Orinoquía, los macroinvertebrados acuáticos desarrollan estrategias reproductivas y de supervivencia especiales para sobreponerse a los cambios drásticos impuestos por el medio, como se interpreta la valoración físico-química "In situ" del agua de los esteros estudiados, cuyos valores promedio multianuales son: Temperatura 29.4°C, Conductividad Eléctrica 263 µS.cm¯¹, pH 6.0 y OD4.4 mg.l¯¹Palabras clave: Esteros, macroinvertebrados, semipermanentes, Yopal.ABSTRACT: It makes contributions to knowledge about the life cycles of macroinvertebrates and their microhabitats are characterized in three semi-permanent water bodies in flooded savannah and overflow in the high plains of the municipality of Yopal-Casanare (tropical ponds San Martín (SM), the Trompillo ( T) and Illusion (LI): 05 ° 21 '31''N 072 º 13' 16''W, located at 214 meters). Result of qualitative analysis of material samples collected from multi-year (1998, 1999, 2002 and 2008) in three (I, II and III) different periods of rainfall in the months from May to December, there were 19 families with 29 morphospecies (24 sp SM, 20 T, 18 LI) for stage I; 28 families and 47 morphospecies (35 SM, 27 T, 32 LI) in stage II; and 35 families, 57 morphospecies (52 SM, 40 T, 35 LI) in the stage III. Macroinvertebrate communities in these ecosystems show various stages of life cycle: adult, adults and larvae, adults, larvae and pupae, larvae and pupae, larvae. The San Martin pond recorded the highest species diversity followed by Trompillo and Illusion. The San Martin pond presented the greatest diversity in the month of December, followed by July and the lowest reading was obtained in May, coinciding with the onset of flooding of the plains.In these environments the plain and the high plains of the Orinoco, aquatic macroinvertebrates develop reproductive and survival strategies to overcome special drastic changes imposed by the environment, as interpreted physical- chemical assessment in situ of water ponds studied, whose multi-year average values are: temperature 29.4 ° C, Electrical Conductivity 263 µS.cm ¯ ¹, pH 6.0 and OD 4.4 mg.l ¯¹Key words: macroinvertebrates, tropical ponds, semipermanent, Yopal.
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Cummins, Kenneth W., Margaret Wilzbach, Brigitte Kolouch, and Richard Merritt. "Estimating Macroinvertebrate Biomass for Stream Ecosystem Assessments." International Journal of Environmental Research and Public Health 19, no. 6 (March 9, 2022): 3240. http://dx.doi.org/10.3390/ijerph19063240.
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We propose a field procedure for estimating the dry biomass of stream macroinvertebrates. Estimates are calculated using the mean values of the a and b regression coefficients from unpublished data and an extensive review of the relevant literature. The regression equation employed for calculating dry biomass is one that has been extensively used: Y = aXb, where Y = mg dry mass of an individual macroinvertebrate; X = mm total body length of an individual macroinvertebrate; a = intercept coefficient of the Y on X regression; and b = slope coefficient Y on X. The procedure was developed for use in the field, but dry mass estimates can also be made on preserved specimens. The case is made for presenting stream macroinvertebrate dry biomass data categorized by functional feeding groups (FFGs) and their component higher level taxa. The tables summarize the FFGs and their food resources, mean regression coefficients, dry biomass estimates for FFG-taxa by size and a comparison of their numerical-to-gravimetric surrogate FFG ratios to predict the stream environmental condition. A sizing template for rapidly sorting macroinvertebrates in the field is described. Thresholds for surrogate FFG ratios that directly predict measured stream ecosystem conditions are described.
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Monaghan, Kieran A., and Alexander M. Milner. "Salmon carcasses as a marine-derived resource for benthic macroinvertebrates in a developing postglacial stream, Alaska." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 7 (July 2008): 1342–51. http://dx.doi.org/10.1139/f08-058.
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Streams formed in Glacier Bay, southeast Alaska, following glacial recession rapidly support populations of spawning salmon. Using both observational and experimental approaches, we examined the importance of pink salmon ( Oncorhynchus gorbuscha ) carcasses for benthic macroinvertebrate communities, approximately 10 years after salmon first colonized Wolf Point Creek, a first-order, lake-fed stream. Macroinvertebrate abundance on carcasses naturally accumulating in the stream channel was low, dominated by chironomids ( Eukiefferiella spp.). Macroinvertebrate drift was significantly lower from artificial experimental channels containing salmon flesh (P < 0.001) compared with channels without. However, the density and community structure of macroinvertebrates colonizing rock baskets in channels was not significantly different between treatments. In a separate experiment, colonization of substrate trays with salmon and control (inert) fillets were associated with differences in community structure; simuliids dominated control fillets, and chironomids dominated fish fillets, while underlying stone substrate was colonized by a more diverse community including Ephemeroptera, Plecoptera, and Trichoptera taxa (EPT). Excluding simuliids, abundance was significantly higher on fish compared with control fillets (P < 0.001). These data suggest that scales and mucus prevent the direct consumption of flesh from whole carcasses, highlighting the role predators–scavengers in facilitating flesh consumption by benthic macroinvertebrates.
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Yimer, Hayal Desta, and Seyoum Mengistou. "Water Quality Parameters and Macroinvertebrates Index of Biotic Integrity of the Jimma Wetlands, Southwestern Ethiopia." Journal of Wetlands Ecology 3 (February 11, 2010): 79–99. http://dx.doi.org/10.3126/jowe.v3i0.2265.
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The wetlands located at the periphery of Jimma town, southwestern Ethiopia, have critical roles in providing a range of ecological and socio-economic benefits, yet they are subject to increasing anthropogenic disturbances, notably through agriculture, settlement, intensive grazing and brick-making. This study assessed the ecological status of these wetlands, and examined the scale of the human disturbances that local communities might impose on them. Macroinvertebrate communities, water quality parameters, and human disturbance scores were assessed. Except for electrical conductivity and water temperature, no significant difference (P < 0.05) was found in physico-chemical parameters between the sampled sites. Nitrate was the only parameter that correlated with significant influence on species richness of the sampled macroinvertebrates. A total of 10 metrics were used to generate the index of biotic integrity (IBI). This IBI was then tested based on macroinvertebrate data collected. Ways of assessing and evaluating the existing ecological status of the wetlands are discussed in the context of physico-chemical parameters, IBI based on macroinvertebrates and human disturbance scales. Key Words: Catchments land use; Water quality; Macroinvertebrate; Index of Biotic Integrity; Wetland DOI: 10.3126/jowe.v3i0.2265 Journal of Wetlands Ecology, (2009) Vol. 3, pp 77-93