The role of selection and historical factors in driving population differentiation along an elevational gradient in an island bird

Journal of Evolutionary Biology
J A M BertrandBorja Milá

Abstract

Adaptation to local environmental conditions and the range dynamics of populations can influence evolutionary divergence along environmental gradients. Thus, it is important to investigate patterns of both phenotypic and genetic variations among populations to reveal the respective roles of these two types of factors in driving population differentiation. Here, we test for evidence of phenotypic and genetic structure across populations of a passerine bird (Zosterops borbonicus) distributed along a steep elevational gradient on the island of Réunion. Using 11 microsatellite loci screened in 401 individuals from 18 localities distributed along the gradient, we found that genetic differentiation occurred at two spatial levels: (i) between two main population groups corresponding to highland and lowland areas, respectively, and (ii) within each of these two groups. In contrast, several morphological traits varied gradually along the gradient. Comparison of neutral genetic differentiation (FST ) and phenotypic differentiation (PST ) showed that PST largely exceeds FST at several morphological traits, which is consistent with a role for local adaptation in driving morphological divergence along the gradient. Overall, our results reve...Continue Reading

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Citations

May 24, 2018·Journal of Evolutionary Biology·Gabrielle Dubuc-MessierAnne Charmantier
Mar 19, 2020·Proceedings. Biological Sciences·Maëva GabrielliChristophe Thébaud
Apr 8, 2017·Royal Society Open Science·Yann X C BourgeoisChristophe Thébaud
May 12, 2021·Royal Society Open Science·Claudia A MartinLewis G Spurgin

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