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Title: Evolutionary and demographic correlates of Pleistocene coastline changes in the Sicilian wall lizard Podarcis wagleriana

Journal Article · · Journal of biogeography (Print)
DOI:https://doi.org/10.1111/jbi.13479· OSTI ID:1483897
ORCiD logo [1]; ORCiD logo [2];  [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]
  1. Department of Biology and Biotechnology “Charles Darwin” University of Rome “La Sapienza” Rome Italy
  2. CIBIO‐InBIO Centro de Investigação em Biodiversidade e Recursos Genéticos Universidade do Porto Vairão Portugal
  3. National Research Council Institute of Ecosystem Study Verbania Pallanza Italy
  4. Department of Ecological and Biological Science University of Tuscia Viterbo Italy
  5. CIBIO‐InBIO Centro de Investigação em Biodiversidade e Recursos Genéticos Universidade do Porto Vairão Portugal, Department of Health, Life and Environmental Sciences University of L'Aquila L'Aquila Italy

Abstract Aim Emergence of coastal lowlands during Pleistocene ice ages might have provided conditions for glacial expansions (demographic and spatial), rather than contraction, of coastal populations of temperate species. Here, we tested these predictions in the insular endemic Sicilian wall lizard Podarcis wagleriana . Location Sicily and neighbouring islands. Methods We sampled 179 individuals from 45 localities across the whole range of P. wagleriana . We investigated demographic and spatial variations through time using Bayesian coalescent models (Bayesian phylogeographic reconstruction, Extended Bayesian Skyline plots, Isolation‐with‐migration models) based on multilocus DNA sequence data. We used species distribution modelling to reconstruct present and past habitat suitability. Results We found two main lineages distributed in the east and west portions of the current species range and a third lineage restricted to a small area in the north of Sicily. Multiple lines of evidence from palaeogeographic (shorelines), palaeoclimatic (species distribution models), and multilocus genetic data (demographic and spatial Bayesian reconstructions) indicate that these lineages originated in distinct refugia, located in the north‐western and south‐eastern coastal lowlands, during Middle Pleistocene interglacial phases, and came into secondary contact following demographic and spatial expansions during the last glacial phase. Main conclusions This scenario of interglacial contraction and glacial expansion is in sharp contrast with patterns commonly observed in temperate species on the continent but parallels recent findings on other Mediterranean island endemics. Such a reverse expansion–contraction ( EC ) dynamic has been likely associated with glacial increases of climatically suitable coastal lowlands, suggesting this might be a general pattern in Mediterranean island species and also in other coastal regions strongly affected by glacial marine regressions during glacial episodes. This study provides explicit predictions and some methodological recommendations for testing the reverse EC model in other region and taxa.

Sponsoring Organization:
USDOE
OSTI ID:
1483897
Journal Information:
Journal of biogeography (Print), Journal Name: Journal of biogeography (Print) Vol. 46 Journal Issue: 1; ISSN 0305-0270
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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