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Is embryo abortion a post-zygotic barrier to gene flow between Littorina ecotypes?

Journal article
Authors Kerstin Johannesson
Z. Zagrodzka
R. Faria
A. M. Westram
Roger Butlin
Published in Journal of Evolutionary Biology
Volume 33
Issue 3
Pages 342-351
ISSN 1010-061X
Publication year 2020
Published at Department of marine sciences, Tjärnö Marine Laboratory
Pages 342-351
Language en
Links dx.doi.org/10.1111/jeb.13570
Keywords Dobzhansky-Muller incompatibilities, gene flow barriers, maladaptation, malformed embryos, dobzhansky-muller incompatibilities, reproductive isolation, saxatilis, olivi, genomic divergence, local adaptation, abnormal embryos, hybrid, zones, evolution, speciation, selection, Environmental Sciences & Ecology, Evolutionary Biology, Genetics &, Heredity
Subject categories Biological Sciences

Abstract

Genetic incompatibilities contribute to reproductive isolation between many diverging populations, but it is still unclear to what extent they play a role if divergence happens with gene flow. In contact zones between the "Crab" and "Wave" ecotypes of the snail Littorina saxatilis, divergent selection forms strong barriers to gene flow, while the role of post-zygotic barriers due to selection against hybrids remains unclear. High embryo abortion rates in this species could indicate the presence of such barriers. Post-zygotic barriers might include genetic incompatibilities (e.g. Dobzhansky-Muller incompatibilities) but also maladaptation, both expected to be most pronounced in contact zones. In addition, embryo abortion might reflect physiological stress on females and embryos independent of any genetic stress. We examined all embryos of >500 females sampled outside and inside contact zones of three populations in Sweden. Females' clutch size ranged from 0 to 1,011 embryos (mean 130 +/- 123), and abortion rates varied between 0% and 100% (mean 12%). We described female genotypes by using a hybrid index based on hundreds of SNPs differentiated between ecotypes with which we characterized female genotypes. We also calculated female SNP heterozygosity and inversion karyotype. Clutch size did not vary with female hybrid index, and abortion rates were only weakly related to hybrid index in two sites but not at all in a third site. No additional variation in abortion rate was explained by female SNP heterozygosity, but increased female inversion heterozygosity added slightly to increased abortion. Our results show only weak and probably biologically insignificant post-zygotic barriers contributing to ecotype divergence, and the high and variable abortion rates were marginally, if at all, explained by hybrid index of females.

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