Phylogeny and biogeography of the endemic Hemidactylus geckos of the Indian subregion suggest multiple dispersals from Peninsular India to Sri Lanka

Lajmi, A and Bansal, R and Giri, V and Karanth, P (2019) Phylogeny and biogeography of the endemic Hemidactylus geckos of the Indian subregion suggest multiple dispersals from Peninsular India to Sri Lanka. In: Zoological Journal of the Linnean Society, 186 (1). pp. 286-301.

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Abstract

Factors shaping biotic assembly of an island compared with the mainland are of considerable interest in biogeography, and the island of Sri Lanka and mainland India provide an interesting setting in which to study this process. We tested two contrasting hypotheses, faunal exchange vs. in situ diversification, to explain how the biota of Sri Lanka might have assembled. We studied the radiation of Hemidactylus geckos, endemic to India and Sri Lanka, to understand the biogeographical processes underlying the faunal assembly of Sri Lanka. We performed molecular phylogenetic analysis, divergence data estimation and ancestral area reconstruction. Diversification in this radiation began ~34.5 Mya in India, followed by seven independent dispersal events from India to Sri Lanka. Two dispersal events occurred in the Early to Middle Miocene, leading to two endemic Sri Lankan species. Marine transgression events separating the two landmasses are likely to have led to vicariant speciation in these cases. The other five dispersal events led to range expansion in species largely restricted to open semi-arid habitats and were likely to be more recent. These results indicate that the biotic exchange model better explains the assembly of Sri Lankan Hemidactylus geckos. © 2018 The Linnean Society of London, Zoological Journal of the Linnean Society.

Item Type:	Journal Article
Publication:	Zoological Journal of the Linnean Society
Publisher:	Oxford University Press
Additional Information:	Copy right of this article belongs to Oxford University Press.
Department/Centre:	Division of Biological Sciences > Centre for Ecological Sciences
Date Deposited:	25 Jun 2021 04:06
Last Modified:	25 Jun 2021 04:06
URI:	http://eprints.iisc.ac.in/id/eprint/65383

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