A comparative analysis of hematological parameters was for the first time performed in two ectothermal amphibians of the Middle Ural fauna, the Siberian salamander Salamandrella keyserlingii and lake frog Pelophylax ridibundиs. Species specificity of immune defense was demonstrated with respect to granulocyte and agranulocyte counts (p < 0.001). A high lymphocyte content (73.3-76.1%) of provides for the activation of acquired adaptive immunity mechanisms in the thermophilic lake frog. The Siberian salamander is adapted to low negative temperatures and has a set of nonspecific leukocytes (39.3-44.4%). Innate immunity is better developed in the Siberian salamander compared with the lake frog.
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