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Poster winner #2

POSTER

Genomics of parallel ecotype local adaptation in Littorina saxatalis

Hernán E. Morales(1), Rui Faria(2), Tomas Larsson(1), Marina Panova(1), Roger Butlin(1,2), Kerstin Johannesson(1) & Anja Westram(2)

(1) Department of Marine Sciences - University of Gothenburg, Sweden; (2) Animal and Plant Sciences - University of Sheffield, UK

Presenter contact details: hernan.morales@gu.se, Phone: +46 31-786 0000


The marine snail Littorina saxatilis has repeatedly and independently evolved two ecotypes differentially adapted to contrasting habitats all across northern Europe. Adaptive traits of the wave ecotype include smaller, thinner shells, wide apertures and bold behavior to resist wave action. The crab ecotype exhibit bigger, thicker shells, small apertures and wary behavior to avoid crab predation. The two ecotypes are connected by extensive gene flow. While the main selective forces driving the formation of the two ecotypes act in similar ways all over the species range, site-specific selective pressures also operate. In earlier studies, highly differentiated loci between ecotypes were only rarely shared across localities, suggesting that snails arrived to the same adaptive solution multiple times via different genetic pathways. However, these studies focused on relatively small proportions of the genome and were limited by the lack of genomic resources. Here we present the first whole-genome re-sequencing data for this species. Together with the recent generation of a linkage map and decades of ecological and evolutionary studies, these data allow an unprecedented level of resolution in this study system. We investigated the extent of sharing of the genomic basis of ecotype divergence across multiple localities and countries (Sweden, France, Spain and United Kingdom). We show that multiple clusters of elevated genetic differentiation and sequence divergence can be found all across the genome, some corresponding to putative chromosomal rearrangements. However, not all of the clusters contribute to differentiation in all localities. We investigate the genetic basis, population genomics signatures and genomic architectures of shared and non-shared divergence to better understand the evolutionary history of parallel local adaptation of ecotypes in Littorina saxatilis.

Keyword: Local adaptation; parallel divergence; genome-wide; genomic architecture

Session: 9. Marine Speciation

Poster #: 47
 

Poster winner #2

 

Genomics of parallel ecotype local adaptation in Littorina saxatalis

Hernán E. Morales(1), Rui Faria(2), Tomas Larsson(1), Marina Panova(1), Roger Butlin(1,2), Kerstin Johannesson(1) & Anja Westram(2)

(1) Department of Marine Sciences - University of Gothenburg, Sweden; (2) Animal and Plant Sciences - University of Sheffield, UK

Presenter contact details: hernan.morales@gu.se, Phone: +46 31-786 0000

ABSTRACT

Page Manager: Eva Marie Rödström|Last update: 5/29/2018
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