Аннотация:Using skeletochronology, we compared the age composition and growth rates of marsh frogs (Pelophylax ridibundus) introduced to Kamchatka, from two populations in the territory of the Bystrinsky natural park and the population of the settlement Thermalny, the habitat of which is subject to stronger anthropogenic influence. The results showed that the conservation status of habitats does not have a direct effect onthe age composition and growth rates. The length of the active season had a stronger effect on these population characteristics, but this effect was not unidirectional. The studied Kamchatka populations inhabiting reservoirs with a constant influx of warm water are similar in average size and age dynamics of body size of individualswith some populations from habitats with “heated” reservoirs in other regions of the invasive part of the range, as well as from natural habitats with a high length of the active season in the native part of the range.
