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1994 MARYLAND BIOLOGICAL STREAM SURVEY BENTHIC MACROINVERTEBRATES (BENTH94)
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The Maryland Biological Stream Survey (MBSS) is a multi-year probability-based sampling program designed to assess the status of biological resources in non-tidal streams of Maryland. The MBSS study area comprises eighteen drainage basins across the state of Maryland, providing biological, water chemistry, and physical habitat data for approximately 300 first- through third-order stream sites per year. During 1994, the program conducted a Demonstration Project to test field protocols and refine the sampling design prior to full implementation of the MBSS during 1995-1997. Sampling for the 1994 Demonstration Project was conducted in seven basins: Youghiogheny, Potomac-Washington Metro, Patuxent, West Chesapeake, Susquehanna, Choptank, and Pocomoke. Using rapid bioassessment procedures, the MBSS collects benthic macroinvertebrate samples from a variety of instream habitats during the spring index period. The data set BENTH94 contains counts of individual benthic macroinvertebrate taxa from D-net samples of approximately 100 individuals per sampled site. Macroinvertebrates are identified to family level. Data are from the 1994 MBSS Demonstration Project.