Using macroinvertebrate assemblages and multiple s

Authors: John Nichols Jason A Hubbart Barry C Poulton

Publish Date: 2016/02/03

Volume: 19, Issue: 2, Pages: 679-704

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Abstract

Characterizing the impacts of hydrologic alterations pollutants and habitat degradation on macroinvertebrate species assemblages is of critical value for managers wishing to categorize stream ecosystem condition A combination of approaches including traitbased metrics and traditional bioassessments provides greater information particularly in anthropogenic stream ecosystems where traditional approaches can be confounded by variously interacting land use impacts Macroinvertebrates were collected from two rural and three urban nested study sites in central Missouri USA during the spring and fall seasons of 2011 Land use responses of conventional taxonomic and traitbased metrics were compared to streamflow indices physical habitat metrics and water quality indices Results show that biotic index was significantly different p  005 between sites with differences detected in 54  of traitbased metrics The most consistent response to urbanization was observed in size metrics with significantly p  005 fewer small bodied organisms Increases in fine streambed sediment decreased submerged woody rootmats significantly higher winter Chloride concentrations and decreased mean suspended sediment particle size in lower urban stream reaches also influenced macroinvertebrate assemblages Riffle habitats in urban reaches contained 21  more p = 003 multivoltine organisms which was positively correlated to the magnitude of peak flows r 2 = 091 p = 0012 suggesting that high flow events may serve as a disturbance in those areas Results support the use of macroinvertebrate assemblages and multiple stressors to characterize urban stream system condition and highlight the need to better understand the complex interactions of traitbased metrics and anthropogenic aquatic ecosystem stressorsThe authors would like to thank Bill Mabee and Matt Combes of the Missouri Department of Conservation for conducting the laboratory processing and identification of invertebrate samples Funding was provided by the US Environmental Protection Agency Region 7 through the Missouri Department of Natural Resources PN G08NPS17 under Section 319 of the Clean Water Act and the Missouri Department of Conservation Results presented may not reflect the views of the sponsors and no official endorsement should be inferred Collaborators include but are not limited to Boone County Public Works City of Columbia University of Missouri and the US Geological Survey Special thanks are due to many Interdisciplinary Hydrology Laboratory scientists for field assistance and multiple reviewers whose constructive comments greatly improved the article

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