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A natural hybrid between Hyla arborea and Hyla meridionalis detected by mating calls

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A tree-frog with unusual mating calls was found in an area of sympatry between H. arborea and H. meridionalis. This individual was studied by analysis of mating call structure and allozyme variation. The structure of the testes was also examined. The intermediate characteristics of the mating calls, the heterozygosity of all discriminative loci examined, and the apparent sterility, as shown by testis histology, all corroborate the identification of this hybrid.

Affiliations: 1: Serviço Nacional de Parques, Reservas e Conservaçào da Natureza R. da Lapa, 73, P-1200 Lisboa, Portugal; 2: Laboratoire de Biologie et Génétique Evolutives, C.N.R.S., F-91198 Gif/Yvette, France; 3: Departamento de Zoologica e Antropologia, Faculdade de Ciências de Lisboa, Bloco C2, Campo Grande, P-1700 Lisboa, Portugal


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