To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

HETEROGENEOUS GENOMIC DIF… - University of Gothenburg, Sweden Till startsida
Sitemap
To content Read more about how we use cookies on gu.se

HETEROGENEOUS GENOMIC DIFFERENTIATION IN MARINE THREESPINE STICKLEBACKS: ADAPTATION ALONG AN ENVIRONMENTAL GRADIENT

Journal article
Authors J. DeFaveri
Per R. Jonsson
J. Merila
Published in Evolution
Volume 67
Issue 9
Pages 2530-2546
ISSN 0014-3820
Publication year 2013
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Pages 2530-2546
Language en
Links dx.doi.org/10.1111/evo.12097
Keywords Adaptation, Baltic Sea, gene flow, microsatellite, population differentiation, seascapes genetics, POPULATION GENETIC-STRUCTURE, SEX-BIASED DISPERSAL, COD GADUS-MORHUA, HETEROGENEOUS GENOMIC DIVERGENCE, TURBOT SCOPHTHALMUS-MAXIMUS, HERRING, CLUPEA-HARENGUS, BALTIC SEA, GASTEROSTEUS-ACULEATUS, 3-SPINED, STICKLEBACK, ADAPTIVE DIVERGENCE
Subject categories Biological Sciences

Abstract

Evolutionary divergence among populations occupying ecologically distinct environments can occur even in the face of on-going gene flow. However, the genetic underpinnings, as well as the scale and magnitude at which this differentiation occurs in marine habitats are not well understood. We investigated the patterns and degree of genomic heterogeneity in threespine sticklebacks (Gasterosteus aculeatus) by assessing genetic variability in 20 nongenic and 20 genic (associated with genes important for freshwater adaptation) microsatellite loci in samples collected from 38 locations spanning the entire Baltic Sea coast to the North Sea boundary. Population divergence (F-ST approximate to 0.026) and structuring (five genetic clusters) was significantly more pronounced in the genic as compared to nongenic markers (F-ST approximate to 0.008; no genetic clusters). Patterns of divergence in the genic markers45% of which were identified as outlierscorrelated with local differences in salinity. Yet, a strong positive correlation between divergence in genic and nongenic markers, and their association with environmental factors suggests that adaptive divergence is reducing gene flow across the genome. Apart from providing a clear demonstration of heterogeneous genomic patterns of differentiation in a marine species, the results are indicative of adaptive population structuring across the relatively young Baltic Sea in spite of ample opportunities for gene flow.

Page Manager: Webmaster|Last update: 9/11/2012
Share:

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?