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Communication at the NABS Annual meeting, Keystone, 2000
(478) THE EFFECTIVENESS OF THE EPT INDEX FOR ASSESSING FINE SEDIMENTS IN WADEABLE STREAMS.
R. Hoy. Environmental Sciences and Resources, Portland State University, Portland, OR. 97207 USA
A field study was conducted to assess the relationships between fine sediments and macroinvertebrates along an urban/rural gradient in 15 Oregon stream sites. The EPT index was used to determine the effects of fine sediments on macroinvertebrate assemblages. The EPT index values ranged from a low of 12 % to a high of 92 % with an average of 47 %. The correlation between fine sediments and EPT was very poor (r = -0.07). However, there were much stronger correlations between % of Plecoptera (r = -0.48) and % of Ephemeroptera (r = -0.35) to fine sediments. Percent of Tricoptera positively correlated with fine sediments (r = 0.37). These findings suggest that macroinvertebrates such as Plecoptera are sensitive to fine sediments but the EPT index was not effective in assessing fine sedimentation in our streams.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Bioassessment: Techniques
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