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Communication at the NABS Annual meeting, Keystone, 2000
(485) MACROINVERTEBRATE COMMUNITY STRUCTURE AND CORBICULA FLUMINEA GROWTH AS BIOINDICATORS OF WATERSHED HEALTH IN THE UPPER TRINITY RIVER BASIN, NORTH CENTRAL TEXAS.
J.M. Stephenson, J.D. Csekitz, J.H. Kennedy, and W.T. Waller. Department of Biology, University of North Texas, Texas, U.S.A. 76203
Benthic macroinvertebrate community structure and juvenile Corbicula fluminea growth was compared in urban and rural areas of the Upper Trinity River Basin. Water quality and habitat analyses were conducted during the study period. Geopspatial techniques were used to quantify landuse within the watershed. These data were analyzed in a GIS to identify associations between landuse and ecological conditions. Benthic macroinvertebrate community structure and C.fluminea growth was effective for detecting instream toxicity effluents. Habitat suitability was positively associated with agricultural landuse and negatively associated with urban landuse. Biomonitoring values, however, were negatively associated with agricultural landuse and positively associated with urban landuse. Despite the anthropogenically disturbed habitats at urban sites, increased flow induced by effluent from advanced wastewater treatment plants benefited the benthic community. Comparisons with historical biomonitoring data reveal that ambient toxicity has decreased in the past decade.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Bioassessment: Techniques
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