スリランカにおけるグレーラングールの系統地理学の謎

抄録

The evolution of langurs and macaques in southern Asia is a topic of growing interest, and Sri Lanka is an important but understudied piece of this puzzle. Sri Lanka, situated southeast of India with a geological history of being connected to the sub-continent several times, is classified as one of the world biodiversity hot spots in terms of species, genetic, ecosystem, and geographical diversity. The three sub-species of the endemic toque macaque (TM), the four sub-species of the endemic purple-faced langur (PFL), and the Hanuman or grey langur (GL), a species found across the Indian subcontinent, are distributed across the diverse mosaic of climatic and ecological zones of Sri Lanka. We previously reported a disparity between the phenotypic and mtDNA diversity of toque macaques, whereby all three purported subspecies came under two major mtDNA haplogroups, segregated roughly into two different major elevation zones; mountainous and coastal regions. In this study we present preliminary results on the phylogeography of GL samples. Eighty-two Sri Lankan GL samples (64 feces, 20 blood) originating from 22 different populations across the species' distribution were analyzed. DNA was extracted and the successfully amplified PCR product was sequenced for cytb and D-loop. GL clustered mainly into one large cluster, with 4 minor clusters. Further analysis and sample collection will be necessary before coming to firm conclusions, but PFL clustered with GL into the same haplotype in one small cluster where they live sympatrically, suggesting local hybridization.