title: Taxon composition and genetic variation of water frogs in the Mid-Rhône floodplain.
abstract: Natural hemiclonal hybrid lineages of water frogs reproduce by hybridogenesis, excluding one parental genome in the germ line and mating with the coexisting same parental species. Two such sexual host-hybridogen systems occur in the Rhône valley: the L-E system in the north, the P-G system in the south. Although these hybridogenetic complexes may overlap along the Rhône river, there is no evidence for a contact zone in our samples: only Rana ridibunda and R. esculenta were identified using protein electrophoresis. Whether the absence of R. perezi reflects a more southern distribution or its exclusive occurrence in other habitats, remains to be tested. Comparison of somatic and gonadal tissues reveals that gametogenesis of R. esculenta is of the L-E type: gametes carry ridibunda genomes. R. ridibunda apparently is not native, but was introduced by humans, and the R. esculenta in our samples is probably an immigrant from nearby L-E systems.
authors.affiliation: Esa 5023 du CNRS, unité d'écologie des eaux douces et des grands fleuves, université Claude-Bernard-Lyon-L, Villeurbanne, France.
authors.forename: A
authors.initials: A
authors.lastname: Pagano
authors.forename: P
authors.initials: P
authors.lastname: Joly
authors.forename: H
authors.initials: H
authors.lastname: Hotz
mesh_terms: D000818:Animals; D004586:Electrophoresis; D005260:Female; D005602:France; D005838:Genotype; D006824:Hybridization, Genetic; D008297:Male; D010641:Phenotype; D011506:Proteins / Q000032:analysis; D011893:Rana esculenta / Q000235:genetics* / Q000378:metabolism; D011895:Rana ridibunda / Q000235:genetics* / Q000378:metabolism
chemical_list: D011506:Proteins