The hills are alive with geckos! A radiation of a dozen species on sky islands across peninsular India (Squamata: Gekkonidae, Hemiphyllodactylus) with the description of three new species
Sky Islands are high-elevation environments that are separated by warmer, low elevations, forming natural patches of unique montane habitat that often persist through changing climates. Peninsular India was ancestrally forested and has gradually become more arid since at least the Oligocene, and open landscapes have dominated since the middle-late Miocene. Mesic forests today are largely restricted to coastal mountains and some other montane habitats. A mitochondrial phylogeny and fossil-calibrated timetree of Indian Hemiphyllodactylus reveal an Indochinese origin and an endemic radiation with 12 species-level lineages, where a single species was known, that diversified in the Oligocene-Miocene across montane forest habitats in the Eastern Ghats and south India. The phylogeny also suggests the discontinuous Eastern Ghats mountain range encompasses two distinct biogeographic entities: north and south of the Pennar/Krishna-Godavari River basins. This study highlights the deep history of the region and the importance of montane habitats as islands of unique biodiversity that have persisted through millions of years of changing climates. We describe three new species: Hemiphyllodactylus arakuensis sp. nov., H. jnana sp. nov. and H. kolliensis sp. nov. from montane habitats above 1000 m. The montane habitats of these species are emerging hotspots of reptile endemism, and this study emphasizes the need for systematic biodiversity inventory across India to uncover basic patterns of diversity and distribution.
KeywordsBiogeography Divergence dating Eastern Ghats Systematics Western Ghats
We thank Pratyush P Mohapatra, Aparna Lajmi, R Chaitanya and the Evolutionary Ecology Lab (CES, IISc; Saunak Pal, SP Vijayakumar and Kartik Shanker) for contributing tissues used in this study. We also thank the Andhra Pradesh and Tamil Nadu Forest Departments for collection permits and hospitality and Tarun Khichi, Aniruddha Datta-Roy, V Deepak, R Chaitanya, MS Chaitra, R. Padmawathe and Nikhil Gaitonde for assistance in the field. Lee Grismer helped with r scripts and discussion on multivariate analyses, Maitreya Sil with Lagrange analyses, SR Ganesh with sampling locations in the Shevaroys, and Saunak Pal provided data on BNHS specimens. Joshua Muyiwa, Luis Ceriaco, and Shreya Yadav contributed to nomenclatural discussions. The two reviewers provided useful inputs.
Partial funding came from the Ministry of Environment and Forests, the Department of Atomic Energy (2012/21/06/BRNS to Uma Ramakrishnan), the Department of Science and Technology (DST grant SR/SO/AS-57/2009 to Praveen Karanth), Government of India and National Science Foundation (USA) grant DEB 0844523 to Aaron M Bauer.
Compliance with ethical standards
No live animals were used in experiments, and specimens were collected with permits from the Andhra Pradesh and Tamil Nadu forest Departments, besides from private land and other non-forest areas. Specimens collected for this study were euthanized with halothane, tissue vouchers stored in ethanol and whole specimens fixed with formalin. This study was approved by the National Centre for Biological Sciences, Bangalore (NCBS) animal ethics committee.
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