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Home > Iowa Academy of Science > Journals & Newsletters > Journal of the Iowa Academy of Science > Volume 97 (1990) > Number 4

 

Document Type

Research

Keywords

Lake West Okoboji, Cladocera, dispersion patterns, seasonal abundance, environmental heterogeneity, ecology

Abstract

Seven stations, established in 1968 to sample Cladocera, were sampled again, using the same methods, in 1988. Seven species, all of them in low abundance, are new records for Lake West Okoboji. In 1988, there was little difference 1) in the ranking of the stations relative to abundance of cladocerans, 2) the distribution and abundance of the species by habitat-type, 3) the seasonality of the predominant species in the specific habitats, 4) the temporal patterns of the number of species and total cladoceran abundance in the specific habitats, compared to 1968. On the average there were more species but lower cladoceran abundance in the three bay habitats during the summer of 1988. The biggest difference between the two years was the high degree of predominance in the limnetic by Daphnia pulicaria in 1988 compared to 1968. This difference is attributed co apparent low productivity in 1988 associated with a dry year with little runoff, early stratification of the lake and other evidence of a halt to the rapid eutrophication evident in 1968.

Publication Date

December 1990

Journal Title

Journal of the Iowa Academy of Science

Volume

97

Issue

4

First Page

133

Last Page

141

Copyright

© Copyright 1990 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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