Signals of local adaptation across an environmental gradient among highly connected populations of the Dead Sea Sparrow Passer moabiticus in Israel

Tali Magory Cohen, Ron Haran, Roi Dor*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Populations found at the edge of a species range often have decreased genetic diversity, which together with high gene flow may reduce the ability of a species to adapt to local environmental conditions. The Dead Sea Sparrow Passer moabiticus occupies a disjointed range, where the Israeli populations are considered peripheral and fragmented. The species is also thought to have undergone a recent range expansion. We aimed to describe the genetic and morphological variation of the Israeli populations and to determine the extent of gene flow among them. We expected that because of the small latitudinal gradient across Israel and the recent range expansion of the species that Dead Sea Sparrow populations would show no significant morphological adaptation to local environmental conditions, and that considerable gene flow would be taking place among populations. Our findings indicate the existence of gene flow, suggesting high connectivity among populations, but recovered no support for a recent range expansion, possibly due to insufficient time since expansion for mutations to have accumulated. However, despite recurrent gene flow among populations, latitudinal variation in wing length (male and female) and body mass (male) was indicative of local adaptation across Israel, in accordance with Bergmann's rule.

Original languageEnglish
Pages (from-to)619-631
Number of pages13
JournalIbis
Volume161
Issue number3
DOIs
StatePublished - 1 Jul 2019

Funding

FundersFunder number
Israel Nature and Parks Authority
Israeli Bird Ringing Centre
Rauri Bowie
Society for the Protection of Nature in Israel
American Museum of Natural History
Seventh Framework Programme

    Keywords

    • gene flow
    • genetic diversity
    • peripheral populations
    • phenotypic variation
    • population structure
    • range expansion

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