Biotelemetry of crustacean decapods: sampling design,statistical analysis,and interpretation of data |
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Authors: | Edlin Guerra-Castro Carlos Carmona-Suárez Jesús E Conde |
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Institution: | (1) School of Natural Resources and Environment, University of Michigan, 440 Church Street, Ann Arbor, MI 48109, USA;(2) Cooperative Institute for Limnology and Ecosystems Research, 4840 South State Street, Ann Arbor, MI 48108, USA;(3) Present address: College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, 104 Illick Hall, Syracuse, NY 13210, USA |
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Abstract: | Lotic systems in many regions of the country have experienced habitat degradation and biodiversity loss due to agricultural
activity and urbanization. Southeastern Michigan is no exception, as agriculture in the River Raisin watershed and increased
urbanization in the Huron River watershed threatens both systems. To further understand the ecological impact of land use
on trophic interactions in Midwestern streams and assess the use of a selected set of weighted, quantitative food web metrics
as a tool for investigating the influence of anthropogenic disturbance on these systems we compared summer food webs for nine
second-order streams. All streams were categorized as developed, undeveloped, or agricultural based on land cover data. Developed
and undeveloped streams were located in the Huron River watershed and agricultural streams were located in the River Raisin
watershed. Reach-level habitat quality was also assessed at each study site using the EPA’s Rapid Habitat Assessment. Fish
diets (n = 410) were analyzed to create summer food webs for each site. Comparisons of food webs were made using a suite of weighted,
quantitative metrics to identify differences in fish–macroinvertebrate interactions across streams with differing land cover
at the sub-basin scale and habitat quality at the local scale. Although undeveloped streams had higher species richness and
less habitat degradation, no significant patterns were observed in the quantitative metrics across the three stream categories
or based on reach-level habitat conditions. Decapoda, terrestrial Hymenoptera, and Chironomidae were the primary prey taxa
in all stream categories. Decapods accounted for the majority of biomass consumed and the pattern of this consumption strongly
influenced metric scores. The suite of quantitative metrics tested in this study did not detect significant differences in
fish–macroinvertebrate food webs across land use categories, likely in part due to the dominance of a large, tolerant prey
taxa in fish diets, regardless of land use and local habitat quality. |
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