ИСТИНА

Adaptations to local environments in larval growth rate of moor frog Rana arvalis may be associated with polymorphism in locus RC08604, partly located in thyroid-hormone receptor (Trβ) gene (Richter-Boix et al., 2011). Marsh frog Pelophylax ridibundus can change life-cycle traits (first of all the age and body size at maturity) in various warm water habitats. In natural thermal ponds of Kamchatka peninsula (Lyapkov, 2014) and in a small thermal sedimental pond near Nizhny Tagil (Fominykh, Lyapkov, 2012), P.ridibundus forms numerous groups of overwintering tadpoles, moreover, these overwintering tadpoles often develop into frogs with higher fitness components (body size and reproductive characteristics. Both Kamchatka and Nizhny Tagil P. ridibundus populations were founded by few frogs, introduced from European Russia. We have found reduced diversity in microsatellite loci (Rrid059A, RlCA1b5, Rrid171A) in Kamchatka populations of P. ridibundus, and locus RC08604 displayed almost no allelic diversity at all. No evidence of selection in this locus was found in Kamchatka populations of P. ridibundus.