Abstract
The combined effects of food (Chlorella) and temperature on the population growth of a laboratory clone of the rotiferBrachionus patulus were studied. The intrinsic rate of increase (r) as well as the maximum densities achieved were a function of temperature. While ther was negative at 15°C regardless of food level, its magnitude was dependent on food level at medium (25°C) and high (35°C) temperatures, indicating a significant temperature × food interaction. The seasonal variations in the abundance ofBrachionus patulus in the plankton of a regularly sampled pond are explained in terms of the observed food-temperature effects on the survival and reproduction of the laboratory population.
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