Adaptation, ancestral variation and gene flow in a 'Sky Island' Drosophila species.

ABSTRACT: Over time, populations of species can expand, contract, fragment and become isolated, creating subpopulations that must adapt to local conditions. Understanding how species maintain variation after divergence as well as adapt to these changes in the face of gene flow is of great interest, especially as the current climate crisis has caused range shifts and frequent migrations for many species. Here, we characterize how a mycophageous fly species, Drosophila innubila, came to inhabit and adapt to its current range which includes mountain forests in south-western USA separated by large expanses of desert. Using population genomic data from more than 300 wild-caught individuals, we examine four populations to determine their population history in these mountain forests, looking for signatures

SUBMITTER: Hill T 

PROVIDER: S-EPMC7945764 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature