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

Nelson G. Hairston and Sara L. Kellermann
Ecology
Vol. 46, No. 1/2 (Jan., 1965), pp. 134-139
Published by: Wiley
DOI: 10.2307/1935264
Stable URL: http://www.jstor.org/stable/1935264
Page Count: 6
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Competition between Varieties 2 and 3 of Paramecium Aurelia: The Influence of Temperature in a Food-Limited System
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Abstract

Variety 2 of Paramecium aurelia won over Variety 3 in laboratory competition experiments at 5, 15, 20, and 25 degrees C, even when Variety 3 was given a 6:1 advantage. The result was obtained most rapidly at 5 degrees, and Variety 3 persisted longest at 15 and 20 degrees. A fourfold 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. _pg 134-139

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