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Historical volcanism and within-island genetic divergence in the Tenerife skink (Squamata: Scincidae)

Brown, RP and Woods, M and Thorpe, RS (2017) Historical volcanism and within-island genetic divergence in the Tenerife skink (Squamata: Scincidae). Biological Journal of the Linnean Society. ISSN 0024-4066

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Abstract

This study examines the genetic diversity of the Tenerife skink (Chalcides viridanus) within the context that Tenerife is now thought to have arisen as a single island as opposed to two/three precursor islands. DNA sequences were obtained from two mitochondrial regions and five nuclear loci. MtDNA divergence was substantial with four geographical clusters being detected. Two of these corresponded to two ancient areas that have undergone little recent eruptive activity (Anaga, Teno), while two further clusters were found within the more volcanically active central region. Nuclear divergence was low and revealed no strong geographical pattern. Estimated divergence of the Anaga group was 0.4-2.1 Ma ago (95% posterior interval), while the divergence time of the Teno cluster was 0.1-1.2 Ma ago. Phylogeographic distributions correspond well with ancient edifices, but divergence times postdate those expected under the previous ‘unification of ancient islands’ geological scenario. There is evidence of a major recent expansion of the central group following a decline in eruptive activity in this region, which also fits well with current geological hypotheses. Previously-described within-island evolutionary patterns in other Tenerife species also need to examined within this new geological context.

Item Type: Article
Additional Information: Richard P. Brown, Matthew Woods, Roger S. Thorpe; Historical volcanism and within-island genetic divergence in the Tenerife skink (Chalcides viridanus). Biol J Linn Soc 2017 blx044. doi: 10.1093/biolinnean/blx044
Uncontrolled Keywords: 06 Biological Sciences
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history
Q Science > QH Natural history > QH426 Genetics
Q Science > QL Zoology
Divisions: Natural Sciences and Psychology
Publisher: Linnean Society of London
Date Deposited: 04 Apr 2017 09:09
Last Modified: 26 May 2017 10:56
DOI or Identification number: 10.1093/biolinnean/blx044
URI: http://researchonline.ljmu.ac.uk/id/eprint/6206

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