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Document Type

Research

Keywords

Zooplankton, Species Composition, Reservoir Flushing

Abstract

The effects of nutrient renewal, conservation pool water level, and the average weekly discharge rate on the species composition, relative abundance, and population fluctuations of the Copepoda and Cladocera of Red Rock Reservoir were determined. The average retention time (flushing rate) was 11.2 days. Twenty-one species were identified with the dominants being Cyclops spp., Diaptomus spp., Daphnia spp., Bosmina longirostris, Moina micrura, Ceriodaphnia quadrangula, and Diaphano-soma spp. Three distinct seasonal peaks in population growth were noted. Population fluctuations showed slight correlation with temperature, transparency, discharge rate, nutrient levels and no relationship was seen with water level. A time interval of 18 to 32 days occurred between high nitrate and phosphate levels and population abundance peaks. Species composition showed distinct seasonal changes. Population numbers began increasing at the dam area and continued upstream with declines following the reverse pattern.

Publication Date

January 1972

Journal Title

Proceedings of the Iowa Academy of Science

Volume

78

Issue

3-4

First Page

73

Last Page

75

Copyright

© Copyright 1972 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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