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Grazing of ciliates on blue–green algae: Effects of light shock on the grazing relation and on the algal population

✍ Scribed by F. G. Bader; H. M. Tsuchiya; A. G. Fredrickson

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
732 KB
Volume
18
Category
Article
ISSN
0006-3592

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✦ Synopsis

Abstract

Experiments on the grazing of the ciliate Colpoda steinii on the blue–green alga Anacystis nidulans showed, among other things, that declines of the algal population initiated by grazing often continued for several days after grazing pressure had been released. In addition, long lags were observed when this alga was inoculated into sterile culture medium. Evidence presented in this study indicates that both phenomena were due to cellular damage caused by exposure of algal cells to a sudden increase of light intensity (“light shock”). The occurrence of light shock appeared to exert a destabilizing influence on the grazing relation between Colpoda and Anacystis.

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