Effects of Abnormal Thermal Stratification on a Reservoir Benthic Macroinvertebrate Community

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Abstract
The benthos of Grenada Reservoir, Mississippi [USA], was examined during 1973-1976, when periods of flooding caused abnormally high water levels. The increased water levels resulted in prolonged abnormal hypolimnial stagnation due to lack of normal reservoir drawdown procedures. The stagnation in 1973 caused massive kills of immature Hexagenia bilineata and Oecetis inconspicua larvae in the reservoir conservation pool. Recolonization of the reservoir in 1974 by Hexagenia and Oecetis was unsuccessful due to recurrence of stagnation. The lengthy stagnation changed the structure of the benthic community, and the Hexagenia-Oecetis-Chaoborus-Chironomidae community was replaced by a Limnodrilus-Chaoborus-Chironomidae community. Production initially decreased but later recovered.

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