Taxon composition and genetic variation of water frogs in the Mid-Rhone floodplain |
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Institution: | 1. Department of Biomedical Engineering, Hungkuang University, Taichung 433, Taiwan;2. Department of Mechanical and Computer-Aided Engineering, National Formosa University, Yunlin 632, Taiwan;3. School of Dentistry, China Medical University, Taichung 404, Taiwan;4. Department of Bioinformatics and Medical Engineering, Asia University, Taichung 413, Taiwan;5. Department of Dental Hygiene, China Medical University, Taichung 404, Taiwan |
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Abstract: | Natural hemidonal 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 hosthybridogen 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. |
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