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Science 4 September 1981:
Vol. 213. no. 4512, pp. 1133 - 1135
DOI: 10.1126/science.213.4512.1133
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Articles

Allelopathy Between Zooplankton: A Mechanism for Interference Competition

CAROL FOLT 1 and CHARLES R. GOLDMAN 1

1 Division of Environmental Studies, University of California, Davis 95616

The filtering rate of the copepod Diaptomus tyrrelli is reduced in the presence of its potential competitor and predator, Epischura nevadensis, by as much as 60 percent. This effect is caused by a chemical released into the water by Epischura. The chemical does not pass through dialysis tubing with a pore size of 104 angstroms, indicating that it is a large molecular weight compound. The reduction in filtering rate is the result of interference competition between two species and may be linked to the evolution of a mechanism for avoiding predation.

Submitted on August 11, 1980
Revised on May 27, 1981


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