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Showing 1 to 12 of 12 for “"Benthic macroinvertebrate community structure"”.
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Benthic macroinvertebrate community structure responses to multiple stressors in mining-influenced streams of central Appalachia USA
… sediments, trace elements, and salinity. Benthic macroinvertebrates are widely used as indicators of biological conditions of streams and are frequently sampled using semi-quantitative methods that preclude calculations of areal densities. Studies of central Appalachian mining impacts in …
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Analysis of the Benthic Macroinvertebrate Community Structure for Assessment of Water Quality of the Des Moines River
… was accomplished by sampling and analyzing the benthic macroinvertebrate community. Procedure. Artificial substrates at five stations collected macroinvertebrates. Community structure was analyzed using species diversity indices. Species diversity (D) and redundancy (R) values were used to …
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Effects of a Textile Mill Effluent and a Low Water Dam on Benthic Macroinvertebrate Community Structure of the Guadalupe River in Comal County, Texas
… and a ponar dredge were used to take samples of benthic macroinvertebrates and population densities were expressed in numbers per square meter. Water temperature and oxygen concentrations were also measured. The 59 benthic macroinvertebrate taxa found were dominated by Hyalella azteca …
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Toward improved assessment of freshwater salinization as a benthic macroinvertebrate stressor
… has been linked to decreased diversity of benthic macroinvertebrates. However, assessments used to reach this conclusion have generally not accounted for temporal variability of salinity, as most studies use "snapshot" SC data collected concurrently with biological data at a single point in …
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Spring-fed streams in Virginia and assessment of livestock impacts
… location factors more effectively predicted fish community structure than did instream habitat or riparian condition, indicating that composition of Virginia spring fish communities was limited by access to colonization sources. Location, size, and instream habitat of springs were related to …
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Short-term effects of defoliation by gypsy moth larvae on Appalachian headwater streams in Virginia
… of headwater stream ecology, water quality, benthic macroinvertebrate community structure, and benthic macroinvertebrate function (expressed as secondary production). The experimental design was to compare measurements in three streams that were extensively defoliated by gypsy moth larvae …
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Evaluation of Bureau of Land Management Protocols for Monitoring Stream Condition
… stressors (mining and grazing) and changes in benthic macroinvertebrate community structure; and to assess the effectiveness of individual questions on a commonly-used Bureau-wide qualitative stream assessment protocol, the proper functioning condition (PFC) assessment. The four GIS distance …
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Levels of Dissolved Solids Associated with Aquatic Life Effects in Headwater Streams of Virginia's Central Appalachian Coalfield Region
Benthic macroinvertebrate communities in headwater streams influenced by Appalachian coal mining often differ from communities in minimally distrubed streams. Total dissolved solids (TDS) associated with mining have been suggested as stressors to these communities. In studies of such streams …
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Comparison of Quantitative and Semi-Quantitative Assessments of Benthic Macroinvertebrate Community Response to Elevated Salinity in central Appalachian Coalfield Streams
… can cause adverse effects on aquatic ecosystem structure and function. In central Appalachia, eastern USA, studies largely rely on Rapid Bioassessment Protocols with semi-quantitative sampling to characterize benthic macroinvertebrate community response to increased salinity caused by surface …
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Temporal Dynamics of Benthic Macroinvertebrate Communities and Their Response to Elevated Specific Conductance in Headwater Streams of the Appalachian Coalfields
… streams, and others have examined SC effects on benthic macroinvertebrate communities using point-in-time SC measurements. However, both SC and benthic macroinvertebrate communities exhibit temporal variation. Twelve Appalachian headwater streams with minimally impacted physical habitat and …
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Benthic Community Structure Response to Flow Dynamics in Tropical Island and Temperate Continental Streams
… in lotic ecosystems are influential in the structure and function of aquatic benthic communities. Human activities and the increased demand for freshwater have caused the modification of natural flow regimes worldwide. Hydrological alterations, such as dams, diversions, and channelizations, …