The role of interactions between individual animals in the response to heat stress in the freshwater crustacean <Emphasis Type="Italic">Daphnia magna</Emphasis> |
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Authors: | T B Kalinnikova I A Krasnoperova T M Gainutdinov S V Sadykova M Kh Gainutdinov |
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Institution: | (1) Institute of Ecology of Natural Systems, Academy of Sciences of Tatarstan, ul. Daurskaya 28, Kazan, 420087 Tatarstan, Russia |
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Abstract: | The thermal resistance of Daphnia magna Straus is a trait depending on the interaction between individuals. The group effect is expressed in D. magna as both a decrease in thermal resistance and a marked individual differentiation with respect to thermal resistance. Two types of interactions between individual D. magna have been found: (1) the release of an unidentified factor decreasing thermal resistance (without noticeably changing the phenotypic variability of this trait) into the medium and (2) a decrease in the thermal resistance of individuals poorly adapted to heat stress, with the thermal resistance of well-adapted individuals (determined by the dependence of thermal resistance on interactions between individuals) remaining the same or even slightly increasing.Translated from Ekologiya, No. 2, 2005, pp. 126–131.Original Russian Text Copyright © 2005 by Kalinnikova, Krasnoperova, T. Gainutdinov, Sadykova, M. Gainutdinov. |
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Keywords: | Daphnia magna heat stress interactions between individuals thermal resistance variability |
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