Abstract
Abstract Frogs of the Rana esculenta complex from some Swedish populations were examined and compared with imported R. ridibunda. Four groups of the frogs were discriminated from morphometrical indices : two correspond to the parental species R. lessonae(LL) and R. ridibunda(RR, not found freeliving in Sweden), one with the triploid hybrids of RRL genotype, and finally one group with LR and LLR hybrids. Albumin patterns revealed by serum electrophoresis confirmed the genotypes, with gene dosage effects being apparent in the triploids. Triploids were furthermore identified by their large erythrocytes in blood smears. Immunological distances measured with antisera to the lessonae albumin and to the slow ridibunda albumin demonstrated the five groups of frogs in the material by distincly resolving all the possible combinations of genomes (LL, LLR, LR, RRL and RR).
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