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Diel Variation in Species Composition and Diversity, Density, and Chlorophyll Content of Phytoplankton in an Intermittent Stream in Oklahoma

Robert Mahnken and Jerry Wilhm
The Southwestern Naturalist
Vol. 27, No. 1 (Feb. 19, 1982), pp. 79-86
DOI: 10.2307/3671410
Stable URL: http://www.jstor.org/stable/3671410
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Diel Variation in Species Composition and Diversity, Density, and Chlorophyll Content of Phytoplankton in an Intermittent Stream in Oklahoma
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Abstract

Physicochemical measurements and phytoplankton were collected every 3 h during four, 24-h sampling periods in summer, 1976 and 1977, from Otter Creek, Oklahoma. Chlorophyll concentration and phytoplankton density were correlated with highest values occurring in late morning or afternoon. Ninety-four taxa of phytoplankton were collected; most were planktonic diatoms, green algae, or euglenophytes. Diel variations in species diversity and equitability was small and generally reflected changes in one or two dominant species. The algal pollution index exhibited considerable diel variation, indicating the importance of considering time of day when using the index.

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