Acta Zoologica Cracoviensia, 31() 1988
Principles of studies of European water frogs
Abstract:
For the last 24 years (1963-1986) the author has been working on European water frogs. He has crossed more than 740 pairs of water frogs, and has counted and measured the eggs from over 600 females of all six European species and their five hybrids which live in wild, and other hybrids received in crossing experiments in laboratory. He has reared over 20 000 metamorphosed froglets of which more than 4000 individuals were devoted for further rearing to study their various features during their ontogenetic development. During this long period he has elaborated numerous roaring and investigative methods which he has gathered in this paper.
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