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Communication at the NABS Annual meeting, Keystone, 2000
(431) MACROINVERTEBRATE DISTRIBUTIONS AMONG WETLAND HABITATS IN THE UPPER MIDWEST.
L.B. Johnson1, J.D. Schomberg1, K. Stroom1, C. Richards2, C. Johnson1, and V. Beasley3. 1University of Minnesota, 5013 Miller Trunk Highway, Duluth, MN 55811, 2Minnesota Sea Grant, 2305 E. 5th Street, Duluth, MN 55812, 3University of Illinois, College of Veterinary Medicine, Urbana, IL 61801
Macroinvertebrate communities have been poorly characterized in emergent wetlands in the Midwestern U.S., and little information exists linking macroinvertebrate community structure to wetland functional values. The distribution and abundance of macroinvertebrate families was examined in thirty six emergent wetlands in central Minnesota in 1999. Semi-quantitative samples were derived using a timed constrained dipnet sampling scheme in five habitat types: open water, sparse submergent, submergent, emergent non-Typha, and emergent Typha. Twelve macroinvertebrate metrics were derived from the taxonomic data describing taxon richness, trophic structure (number of predators, herbivores), and dominance of top three taxa. There were significant differences among habitats for metrics enumerating taxon richness including the number of Ephemeroptera + Trichoptera + Spheriidae and Odonate taxa (ETSO), number of Odonate taxa, number of Hemiptera taxa, and the proportion of the community composed of Dytiscid beetles. No significant differences were observed for metrics describing trophic structure. We will discuss macroinvertebrate community structure in the context of wetland functional values.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Wetlands
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