Demographic features of populations of the marsh frog (<Emphasis Type="Italic">Rana ridibunda</Emphasis> Pall.) introduced into water bodies of the Middle Urals |
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Authors: | N L Ivanova O A Zhigalski |
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Institution: | 1.Institute of Plant and Animal Ecology, Ural Division,Russian Academy of Sciences,Yekaterinburg,Russia |
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Abstract: | Demographic characteristics of marsh frog (Rana ridibunda Pall.) populations have been studied in cooling reservoirs of Middle Ural thermal power plants, where this species was introduced
accidentally. The reservoirs are similar in hydrochemical characteristics but differ in the thermal regime. The populations
studied have been found to differ from the reference (natural) populations and from each other in a number of parameters,
including the size and age composition of spawners, the type of spawning, and fecundity. Analysis of the results indicates
that the observed differences have adaptive significance. |
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