Benthic Macroinvertebrate Community Analysis

Benthic macroinvertebrates were sampled quantitatively at 2 sites in Little Beaver Creek, 1 site in Big Run, and at two reference streams, Sugar Run, and Sunfish Creek in fall 1991 through fall 1993.

The benthic community at Little Beaver Creek 5, just below Outfall X-230J7 is subject to toxic conditions. For example, the EPT (mayflies, stoneflies, and caddisflies - usually more sensitive invertebrates) richness was substantially lower than at reference streams (Figure 1). .
The impact on the benthic community decreased downstream in Little Beaver Creek, with EPT values similar to reference streams.
The community in Big Run showed some patterns typical of streams experiencing nutrient enrichment, with EPT values moderate between the two Little Beaver sites.


Figure 1. Ephemeroptera (mayflies), Plecoptera (stoneflies), and Trichoptera (caddisflies) (EPT) richness in streams near PORTS and in reference streams, 1991 to 1993.

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Last Modified: April 17, 2001
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