The temporal and spatial patterns of protozooplankton abundance in a eutrophic temperate lake |
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Authors: | Johanna Laybourn-Parry Judith Olver A Rogerson P L Duvergé |
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Institution: | (1) Institute of Environmental and Biological Sciences, University of Lancaster, LA1 4YQ Lancaster, England;(2) Culture Collection of Algae and Protozoa, Freshwater Biological Association, Ferry House, LA22 0LP Ambleside, Cumbria, England;(3) Present address: University Marine Laboratory, Millport, Isle of Cumbrae, Scotland |
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Abstract: | The temporal and spatial distribution of planktonic protozoa of Esthwaite, a eutrophic lake, was investigated at 7–10 day intervals between February to October 1988. Sarcodine protozoa were of little significance, the plankton was dominated by ciliates and flagellates. Ciliate density peaked in late May to early June with densities reaching 9.2 × 103 1-1. There was considerable variation in spatial distribution and greatest species diversity occurred in March/April. After the establishment of summer stratification the planktonic ciliates were confined to water of >25% oxygen saturation in the water column. Oligotrichs, particularly the genus Strombidium and tintinnids, and peritrichs dominated the ciliate assemblages. There was no correlation between chlorophyll a concentrations and ciliate numbers, but a correlation was apparent between ciliate numbers and flagellate density. There were significant differences between the protozooplankton communities at the different sampling sites in the lake. |
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Keywords: | Chlorophyll a ciliate epilimnion flagellate protozooplankton oxygen sarcodine water column |
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