Schmeller, D., A. Crivelli, and M. Veith. 1997. Genetic and demographic structure of populations of hybridogenetic water frogs (Rana perezi, R. ridibunda) in the Rhône-delta (Camargue, France). 3rd world congress of herpetology, Prag

Abstract -- In southern France and northeastern Spain Rana perezi (SEOANE, 1885) forms a hybridogenetic system with Rana ridibunda (PALLAS, 1771) and Graf's hybrid frog (P-RP-system). We used allozyme electrophoresis, flowcytometry and skeletochronology to study the genetic and demographic structure of water frog populations in the Camargue region. Abiotic characteristics (e.g. pH, salinity, O2, waterlevel, size) of the studied habitats vary over a wide range. Thus, our data allows us a first preliminary insight into the genotypic composition of mixed populations, including the occurrence of triploids, and its dependence on habitat parameters.

KEYWORDS: Amphibia, Rana perezi, Graf's hybrid frog, allozymes, flowcytometry, skeletochronology, habitat preference, population structure

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Peter Beerli (beerli@scs.fsu.edu)