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Abstract

 

This article in SSSAJ

  1. Vol. 45 No. 4, p. 773-777
     
    Received: Oct 30, 1980
    Published: July, 1981


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doi:10.2136/sssaj1981.03615995004500040019x

Grazing of Blue-Green Algae (Cyanobacteria) in Flooded Soils by Cypris sp. (Ostracoda)1

  1. Ian F. Grant and
  2. Martin Alexander2

Abstract

Abstract

Grazing by the microcrustacean, Cypris, on five species of 14C-labelled N2-fixing blue-green algae (cyanobacteria) in flooded soils indicated diet preferences among the algae. Animal size and floodwater temperature markedly affected feeding rates, but pH had little effect from pH 5.0 to 10.0. Control of feeding was achieved with low concentrations of lindane. Cell size of the blue-green algae was not apparently responsible for diet selection, but cell age was significant with two species. It is suggested that nitrogen fixation by blue-green algae in paddy fields may be increased by using inocula of algae not suitable for active grazing or by suppressing grazing by means of insecticides.

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