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Post-glacial establishment of locally adapted fish populations over a steep salinity gradient

Artikel i vetenskaplig tidskrift
Författare Erica H Leder
Carl André
Alan Le Moan
Mats H. Töpel
Anders Blomberg
Jonathan N. Havenhand
K. Lindstrom
Filip Volckaert
Charlotta Kvarnemo
Kerstin Johannesson
Ola Svensson
Publicerad i Journal of Evolutionary Biology
ISSN 1010-061X
Publiceringsår 2020
Publicerad vid Institutionen för marina vetenskaper
Linnécentrum för marin evolutionsbiologi (CEMEB)
Institutionen för biologi och miljövetenskap
Institutionen för kemi och molekylärbiologi
Språk en
Länkar dx.doi.org/10.1111/jeb.13668
Ämnesord genetic differentiation, local adaptation, population genomics, salinity, gradient, sperm traits, genetic mating patterns, sand goby, sexual selection, sperm motility, reproductive isolation, expression analysis, egg survival, f-statistics, genome scans, baltic sea, Environmental Sciences & Ecology, Evolutionary Biology, Genetics &, Heredity
Ämneskategorier Biologiska vetenskaper

Sammanfattning

Studies of colonization of new habitats that appear from rapidly changing environments are interesting and highly relevant to our understanding of divergence and speciation. Here, we analyse phenotypic and genetic variation involved in the successful establishment of a marine fish (sand goby,Pomatoschistus minutus) over a steep salinity drop from 35 PSU in the North Sea (NE Atlantic) to two PSU in the inner parts of the post-glacial Baltic Sea. We first show that populations are adapted to local salinity in a key reproductive trait, the proportion of motile sperm. Thereafter, we show that genome variation at 22,190 single nucleotide polymorphisms (SNPs) shows strong differentiation among populations along the gradient. Sequences containing outlier SNPs and transcriptome sequences, mapped to a draft genome, reveal associations with genes with relevant functions for adaptation in this environment but without overall evidence of functional enrichment. The many contigs involved suggest polygenic differentiation. We trace the origin of this differentiation using demographic modelling and find the most likely scenario is that at least part of the genetic differentiation is older than the Baltic Sea and is a result of isolation of two lineages prior to the current contact over the North Sea-Baltic Sea transition zone.

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