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Genomic architecture of parallel ecological divergence: Beyond a single environmental contrast

Artikel i vetenskaplig tidskrift
Författare Hernán E. Morales
R. Faria
Kerstin Johannesson
Tomas Larsson
Marina Panova
A. M. Westram
Roger Butlin
Publicerad i Science Advances
Volym 5
Nummer/häfte 12
Sidor 13
ISSN 2375-2548
Publiceringsår 2019
Publicerad vid Institutionen för marina vetenskaper
Institutionen för biologi och miljövetenskap, Tjärnö marinbiologiska laboratorium
Sidor 13
Språk en
Länkar dx.doi.org/10.1126/sciadv.aav9963
Ämnesord littorina-saxatilis, reproductive isolation, local adaptation, evolution, snail, differentiation, speciation, gradient, inversions, mechanisms, Science & Technology - Other Topics
Ämneskategorier Biologiska vetenskaper

Sammanfattning

The study of parallel ecological divergence provides important clues to the operation of natural selection. Parallel divergence often occurs in heterogeneous environments with different kinds of environmental gradients in different locations, but the genomic basis underlying this process is unknown. We investigated the genomics of rapid parallel adaptation in the marine snail Littorina saxatilis in response to two independent environmental axes (crab-predation versus wave-action and low-shore versus high-shore). Using pooled whole-genome resequencing, we show that sharing of genomic regions of high differentiation between environments is generally low but increases at smaller spatial scales. We identify different shared genomic regions of divergence for each environmental axis and show that most of these regions overlap with candidate chromosomal inversions. Several inversion regions are divergent and polymorphic across many localities. We argue that chromosomal inversions could store shared variation that fuels rapid parallel adaptation to heterogeneous environments, possibly as balanced polymorphism shared by adaptive gene flow.

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