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首页> 美国政府科技报告 >Benthic Macroinvertebrate Assemblages and Their Relations with EnvironmentalVariables in the Sacramento and San Joaquin River Drainages, California, 1993-1997. National Water-Quality Assessment Program
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Benthic Macroinvertebrate Assemblages and Their Relations with EnvironmentalVariables in the Sacramento and San Joaquin River Drainages, California, 1993-1997. National Water-Quality Assessment Program

机译：1993 - 1997年加利福尼亚萨克拉门托和圣华金河流域的底栖大型无脊椎动物群落及其与环境变量的关系。国家水质评估计划

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The practicality of developing regional biocriteria for the combined Sacramento-San Joaquin river system was evaluated by determining whether samples can be categorized on the basis of benthic macroinvertebrated assemblage structure. The study also aims to evaluate the relations of the sample categories to a variety of environmental variables. Data were collected at 53 sites from 1993 to 1995 in the San Joaquin River drainage and in 1996 and 1997 in the Sacramento River drainage as part of the National Water Quality Assessment Program of the USGS. Two way indicator species analysis, canonical correspondence analysis, and analysis of variance indicated that patterns in riffle sample assemblage structure were highly correlated with a gradient in physical and chemical conditions associated with elevation. The results also suggested that flow regulation associated with large storage reservoirs have negative effects on the total number of taxa and density of macroinvertebrates below foothill dams. Macroinvertebrate assemblages on snags may be useful in family level bioassessments of environmental conditions in valley floor habitats.

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