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Communication at the NABS Annual meeting, Keystone, 2000
(440) SHORELINE CHARACTERISTICS, LITTORAL ZONE HABITATS AND INVERTEBRATE
COMMUNITIES IN EASTERN SOUTH DAKOTA LAKES: IDENTIFYING
RELATIONSHIPS FOR MANAGEMENT.
C.W. Braskamp and N.H. Troelstrup, Jr.. Department of Biology & Microbiology, South Dakota State University, Brookings, SD 57707
Recent efforts have demonstrated significant differences in littoral zone invertebrate communities and littoral habitats between two level three ecoregions in eastern South Dakota. The objective of this effort was to define relationships between measures of invertebrate community structure, littoral zone habitats and shoreline characteristics. Littoral invertebrates, vegetative biomass, substrate texture, water temperature, conductance, dissolved oxygen, pH, shoreline slope, shoreline aspect, canopy cover and shoreline land-use were sampled from 14 lakes in eastern South Dakota. Five random sites were sampled from each basin during the growing seasons of 1996 through 1999 (n = 205). Less obtrusive land-use practices and greater substrate particle size were observed adjacent to steeper slopes. These sites also harbored larger numbers of insects and fewer total invertebrates, vegetative cover and biomass. Littoral areas with clay/silt substrate supported greater vegetative cover, biomass and relative abundance of Mollusca. Total invertebrate abundance and fraction of Annelida were most abundant at sites adjacent to wetland shorelines while relative abundance of Insecta and Mollusca were greatest adjacent to farmsteads and game production areas, respectively. Results of this effort lead toward development of invertebrate community signatures of lake shoreline condition. Established signatures may be used to identify critical areas for management purposes.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Bioassessment
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