Insight into the evolutionary history of Indoplanorbis exustus (Bulinidae: Gastropoda) at the scale of population and species

Sil, M and Mahveen, J and Roy, A and Karanth, KP and Aravind, NA (2022) Insight into the evolutionary history of Indoplanorbis exustus (Bulinidae: Gastropoda) at the scale of population and species. In: Biological Journal of the Linnean Society, 137 (1). 68 -84.

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Abstract

The history of a lineage is intertwined with the history of the landscape it inhabits. Here we showcase how the geo-tectonic and climatic evolution of South Asia and surrounding landmasses have shaped the biogeographical history of Indoplanorbis exustus, a tropical Asian, freshwater snail. We amplified partial COI gene fragments from all over India and combined this with a larger dataset from South and Southeast Asia to carry out phylogenetic reconstruction, species delimitation analysis and population genetic analyses. Two nuclear genes were also amplified from a few individuals per putative species to carry out divergence dating and ancestral area reconstruction analyses. The results suggest that I. exustus dispersed out of Africa into India during the Eocene. Furthermore, molecular data suggest I. exustus is a species complex consisting of multiple putative species. Primary diversification took place in the Northern Indian plains or in Northeast India. The speciation events appear to be primarily allopatric caused by a series of aridification events starting from the late Miocene to early Pleistocene. None of the species appears to have any underlying genetic structure suggestive of high vagility. All the species underwent population fluctuations during the Pleistocene, probably driven by the Quaternary climatic fluctuations.

Item Type:	Journal Article
Publication:	Biological Journal of the Linnean Society
Publisher:	Oxford University Press
Additional Information:	The copyright of this article belongs to Oxford University Press.
Keywords:	India; Southeast Asia; continental drift; gastropod; genetic analysis; genetic structure; paleobiogeography; paleoclimate; phylogenetics; Pleistocene; snail
Department/Centre:	Division of Biological Sciences > Centre for Ecological Sciences
Date Deposited:	14 Jun 2023 09:44
Last Modified:	14 Jun 2023 09:44
URI:	https://eprints.iisc.ac.in/id/eprint/81881

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