Assessment of the Impact of Heavy Metals on Benthic Communities at the Clinch River (Virginia): Evaluation of an Index of Community Sensitivity
作者： William H. Clements , Donald S. Cherry , John H. Van Hassel
DOI: 10.1139/F92-187
关键词: Ecology 、 Water quality 、 Chironomidae 、 Relative species abundance 、 STREAMS 、 Environmental science 、 Benthic zone 、 Abundance (ecology) 、 Species richness 、 Community structure
摘要: Benthic communities (sampled once annually from 1986 to 1989) at stations impacted by copper and zinc were characterized reduced species richness, abundance, a shift in community composition sensitive tolerant taxa. structure varied due fluctuations stream discharge improvements water quality. Sensitivity of 13 dominant taxa Cu was measured outdoor experimental streams exposing organisms (25 μg/L) for 10 d. Sensitivities (si), defined as proportioned reduction abundance treated relative controls, ranged 1.00 several Ephemeroptera that completely eliminated −0.14 increased (Chironomidae: Orthocladiini). An index sensitivity (ICS) based on si (pi) developed the Clinch River. The ICS highly heavy metals useful distinguishing reference stations. There goo...
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