Abstract
1. 1.Study was made of changes in the organismal heat resistance of the sea worm Convoluta convoluta at elevated temperature under experimental and natural conditions. 2. 2.The increase in a population's survival during heat adaptation occurs mainly at the expense of initially low resistant individuals. 3. 3.An adaptive increase in survival is accompanied by narrowing in the individual variability in the heat resistance levels of animals. 4. 4.The resistance adaptations counteract selection caused by elevated temperature and, consequently, should be regarded as adaptations stabilizing the population.
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