Chromosome evolution in the lizard genus Gekko (Gekkonidae, Squamata, Reptilia) in the East Asian islands
| Autor: | I. Arikura, H. Tanaka, Y. Takahashi, N. Akakubo, K. Ohne, S. Kitakawa, R. Iiizumi, M Sakai, M. Nakano, M. Watanabe, H. Shiro, Hidetoshi Ota, Souichirou Kubota, Y. Shibaike, Sei-ichi Kohno, C. Imaoka |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Silver Staining Squamata Population Zoology Biology Chromosomes Evolution Molecular Gekko Genus biology.animal Genetics Animals education Molecular Biology Genetics (clinical) education.field_of_study Geography Lizard Asia Eastern Chromosome Karyotype Lizards biology.organism_classification Chromosome Banding Karyotyping Geographic Information Systems Female Gekkonidae |
| Zdroj: | Cytogenetic and genome research. 127(2-4) |
| ISSN: | 1424-859X |
| Popis: | The lizard genus Gekko consists of over 30 species distributed in Asia and Oceania. From the insular region of East Asia including Japan and Taiwan, 9 species (G. hokouensis, G. japonicus, G. shibatai, G. tawaensis, G. vertebralis,G. yakuensis, and 3 undescribed species) are currently recognized. We made karyological analyses for all these species. Their karyotypes invariably consisted of 2N = 38 chromosomes, but exhibited considerable variation in fundamental number (ranging from 56–62). Substantial chromosomal variation was detected even among populations of a morphologically relatively uniform species, G. hokouensis. Populations of G. hokouensis from the central and northern Ryukyus exhibited prominent female heteromorphic (i.e., ZW type) sex chromosomes. Populations of the southern Ryukyus exclusive of Yonagunijima also had ZW sex chromosomes, whose heteromorphisms were, however, much less prominent. The other G. hokouensis populations including the topotypic continental representatives and the population from Yonagunijima of the southern Ryukyus exhibited no sex chromosome heteromorphism at all. These results strongly suggest that G. hokouensis in the current taxonomic definition actually includes more than 2 species. The process of chromosomal evolution in the East Asian Gekko is hypothesized. |
| Databáze: | OpenAIRE |
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