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Genomic signatures of drift and selection driven by predation and human pressure in an insular lizard

Bassitta, M, Brown, RP, Pérez-Cembranos, A, Pérez-Mellado, V, Castro, JA, Picornell, A and Ramon, C (2021) Genomic signatures of drift and selection driven by predation and human pressure in an insular lizard. Scientific Reports, 11 (1). ISSN 2045-2322

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Abstract

Genomic divergence was studied in 10 small insular populations of the endangered Balearic Islands lizard (Podarcis lilfordi) using double digest restriction-site associated DNA sequencing. The objectives were to establish levels of divergence among populations, investigate the impact of population size on genetic variability and to evaluate the role of different environmental factors on local adaptation. Analyses of 72,846 SNPs supported a highly differentiated genetic structure, being the populations with the lowest population size (Porros, Foradada and Esclatasang islets) the most divergent, indicative of greater genetic drift. Outlier tests identified ~ 2% of loci as candidates for selection. Genomic divergence-Enviroment Association analyses were performed using redundancy analyses based on SNPs putatively under selection, detecting predation and human pressure as the environmental variables with the greatest explanatory power. Geographical distributions of populations and environmental factors appear to be fundamental drivers of divergence. These results support the combined role of genetic drift and divergent selection in shaping the genetic structure of these endemic island lizard populations.

Item Type: Article
Subjects: Q Science > QH Natural history > QH426 Genetics
Q Science > QL Zoology
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Nature Publishing Group
Date Deposited: 23 Mar 2021 09:59
Last Modified: 23 Mar 2021 10:00
DOI or Identification number: 10.1038/s41598-021-85591-x
URI: https://researchonline.ljmu.ac.uk/id/eprint/14661

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