Abstract
This experimental study examines the influence that acyclic stepwise temperature regimes with 4.4 and 8.8°C increments in a range of 14.8 to 25.5°C have on the dynamics of the number of Simocephalus vetulus (O.F. Muller). It is revealed that an increase in the number of this dominant species of littoral zooplankton may be stimulated by differently directed acyclic stepwise changes in temperature. However, the maximal development of the population is registered after a decrease in water temperature from 24.3 ± 0.7 to 20.4 ± 0.5°C and from 19.9 ± 0.8 to 15.5 ± 0.4°C. Under the same temperature conditions, a prolonged stimulating effect is observed. Our results confirm the assumption put forward earlier that, in order to define the real ecological optimum for a species by a specific environmental factor, it is necessary to consider not only the limits of the optimal values of the factor, but also the dynamics of their changes and the possibility of after-effects of the factor (prolonged and delayed effects).
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