Using Mentum Deformities of Chironomus Larvae to Evaluate the Effects of Toxicity and Organic Loading in Streams

The percentage of deformities in Chironomus menta was compared with both an independent measure of stream water quality and predictions of instream toxicity. Simple organic loading caused small (nonsignificant) increases in the frequency of deformities, whereas toxic conditions caused large increases in both the number and types of deformities.

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