Testing bioassessment metrics: macroinvertebrate, sculpin, and salmonid responses to stream habitat, sediment, and metals.

摘要: The purpose of this article is to report on the testing responses multimetric macroinvertebrate and habitat indices common disturbances streams: stream alteration, excessive sediment, elevated metals concentrations. Seven community metrics were combined into a biotic index (MBI), 11 channel morphology, riparian, substrate features index. Indices evaluated by comparing results fish population surveys ratings, percent fine sediments measured Wolman pebble counts, copper Macroinvertebrate scores decreased with increasing percentages either across bankfull or instream widths. copper. One metric, richness Ephemeroptera, Plecoptera, Trichoptera (EPT) taxa, was more responsive both sediment than MBI. Habitat corresponded well age class structure salmonids, but not that benthic sculpins. Both salmonid sculpin classes declined sediments. decline graded classes, whether channel, whereas salmonids consistently responded only