Changes in Benthic Macroinvertebrate Community Structure in Acid and Metal-contaminated Lakes Following Water Quality Improvements
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Published: 1997
Total Pages:
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Published: 1997
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DOWNLOAD EBOOKAuthor: Jennifer A. Reasbeck
Publisher:
Published: 1997
Total Pages:
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Published: 1992
Total Pages: 854
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Published: 1986
Total Pages: 936
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DOWNLOAD EBOOKAuthor: Daniel C. Mcewen
Publisher: CreateSpace
Published: 2013-09-27
Total Pages: 100
ISBN-13: 9781492805311
DOWNLOAD EBOOKThe authors investigated how changing the magnitude and timing of water release in a regulated reservoir impacted macrobenthic invertebrates communities within Voyageurs National Park (VOYA), Minnesota with a before-after control-impact approach, using both multi- and univariate response measures to simultaneously compare impacts on macroinvertebrates across both time and treatment.
Author: Richard Leonard Westphal
Publisher:
Published: 1973
Total Pages: 98
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DOWNLOAD EBOOKAuthor: United States. Environmental Protection Agency. Sediment Oversight Technical Committee
Publisher:
Published: 1992
Total Pages: 234
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DOWNLOAD EBOOKThis document is a compendium of scientifically valid and accepted methods that can be used to assess sediment quality and predict ecological impacts...the intent here is to provide the most useful overall measures or predictors of ecological impacts currently in use rather than procedures that may have limited application outside of a particular regulatory framework... parag The information provided in the compendium on the relative strengths and weaknesses of the different assessment methods can provide assistance in selecting the appropriate methods.
Author: Timothy W. Stewart
Publisher:
Published: 1993
Total Pages: 328
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DOWNLOAD EBOOKAuthor: Roger Holmes (M.Sc.)
Publisher:
Published: 2014
Total Pages: 174
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DOWNLOAD EBOOKFarmers have been encouraged to adopt more sustainable farming practices (BMPs) that mitigate adverse agricultural effects on the natural environment. However, the ability of BMPs to protect or restore riverine systems continues to be questioned due to limited evidence directly linking BMP use with improved ecological conditions. The exclusion of hydrological pathways in previous field studies may explain why a direct link has not yet been established. The goal of this study was to assess the association between benthic macroinvertebrate community structure and the number and location of agricultural BMPs. Macroinvertebrates and water chemistry were sampled in 30 headwater catchments in the Grand River Watershed. Catchments exhibited gradients of BMP use and location as measured by the degree of hydrologic connectedness. Stepwise ordination regressions and variance partitioning were used to determine which environmental variables (i.e., BMP metrics, water chemistry parameters, habitat characteristics, and land use variables) were associated with benthic macroinvertebrate community structure. Water chemistry parameters were negatively associated with BMP metrics suggesting BMPs were mitigating losses of nutrients and sediments. However, BMP abundance and location explained minimal variation in benthic macroinvertebrate structure within the 30 sampled catchments. The absence of a strong association between BMPs and benthic macroinvertebrates may indicate a need for greater numbers and targeted siting of BMPS to improve water quality beyond a threshold point that would allow recolonization of intolerant invertebrate taxa. Focusing of conservation goals on ecological conditions and the promotion of BMPs that enhance in-stream habitat may also be required.