ชื่อผลงานทางวิชาการ
Cryptic Taxonomic Diversity in Two Broadly Distributed Lizards of Thailand (Mabuya macularia and Dixonius siamensis) as Revealed by Chromosomal Investigations (Reptilia: Lacertilia)
ชื่อนักวิจัย
หมวดหมู่ผลงาน
ประเภทผลงาน
บทคัดย่อ
Karyological surveys were made for two common lizards, Mabuya macularia and Dixonius siamensis, in Thailand. Of the M. macularia specimens karyotyped, the one from Mae Yom, northwestern Thailand, had 2n=38 chromosomes in a graded series as previously reported for a specimen from southwestern Thailand. The other specimens, all from eastern Thailand, however, invariably exhibited a 2n=34 karyotype consisting of four large, and 13 distinctly smaller chromosome pairs. Of the D. siamensis specimens, on the other hand, those from eastern Thailand invariably exhibited a 2n=40 karyotype, whereas three males and one female from Mae Yom had 2n=42 chromosomes. Distinct chromosomal variation was also observed within the Mae Yom sample that may reflect a ZW sex chromosome system. These results strongly suggest the presence of more than one biological species within each of those “broadly distributed species”. This further argues the necessity of genetic surveys for many other morphologically defined “common species” in Thailand and its vicinity in order to evaluate taxonomic diversity and endemicity of herpetofauna in this region appropriately.
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Chulalongkorn University
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