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Competition between Varieties 2 and 3 of Paramecium Aurelia: The Influence of Temperature in a Food‐Limited System

Author:
Hairston, Nelson G., Kellerman, Sara L.
Source:
Ecology 1965 v.46 no.1-2 pp. 134-139
ISSN:
0012-9658
Subject:
Paramecium, habitats, temperature
Abstract:
Variety 2 of Paramecium aurelia won over Variety 3 in laboratory competition experiments at 5, 15, 20, and 25°C, even when Variety 3 was given a 6:1 advantage. The result was obtained most rapidly at 5°, and Variety 3 persisted longest at 15 and 20°. A four‐fold difference in food made no difference in the rate at which Variety 2 won, suggesting that at both levels food was severely limiting to the populations. Different combinations of stocks of the two varieties produced significantly different rates at which Variety 2 won. The data are consistent with the hypothesis, derived from field data, that Variety 3 is excluded from certain habitats by competition with Variety 2. A consistent morphological difference between the two varieties is described.
Agid:
5184407