Abstract:
: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.
journal_name
Cytogenet Genome Resjournal_title
Cytogenetic and genome researchauthors
Shibaike Y,Takahashi Y,Arikura I,Iiizumi R,Kitakawa S,Sakai M,Imaoka C,Shiro H,Tanaka H,Akakubo N,Nakano M,Watanabe M,Ohne K,Kubota S,Kohno S,Ota Hdoi
10.1159/000303334subject
Has Abstractpub_date
2009-01-01 00:00:00pages
182-90issue
2-4eissn
1424-8581issn
1424-859Xpii
000303334journal_volume
127pub_type
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