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- W2469978086 abstract "This study investigated the quantitative relationships between benthic macroinvertebrates and stream environmental variables using generalized additive models. The benthic data used in the study were collected by the Virginia Department of Environmental Quality from 1994 through 2001. The benthic macroinvertebrate assemblages were represented by five benthic metrics namely taxonomic richness, proportion of the two most dominant taxa, proportion of sensitive taxa, proportion of tolerant taxon, and proportion of shredders. Twenty environmental variables, of which eight were physicochemical and twelve were habitat related, represented stream environmental conditions. The study findings suggest a sharp decline in taxonomic richness at total suspended solids concentration of 9 mg/L to 17 mg/L. At flow rates above 85 cfs, taxonomic richness decreases with increasing flow rate. As the dissolved oxygen concentration increases, the proportion of sensitive taxa also increases, while the proportion of tolerant taxon and the two most dominant taxa decreases. None of the physicochemical variables showed a significant effect on the proportion of shredders. Also, the variations of pH within the pH range observed in the case study streams (pH 6 to pH 10) had no significant effects on the responses of the benthic metrics. For the habitat variables, taxonomic richness and sensitive taxa positively correlated with channel flow status and substrate, respectively. Tolerant taxon negatively correlated with substrate." @default.
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- W2469978086 date "2006-12-01" @default.
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- W2469978086 title "Modeling the Relationships between Benthos and Stream Environmental Variables" @default.
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- W2469978086 doi "https://doi.org/10.29769/je.200612.0008" @default.
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