---
_id: '13067'
abstract:
- lang: eng
  text: 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 postzygotic barriers due to selection
    against hybrids remains unclear. High embryo abortion rates in this species could
    indicate the presence of such barriers. Postzygotic 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 1011 embryos (mean 130±123) and abortion rates varied between 0 and100% (mean
    12%). We described female genotypes by using a hybrid index based on hundreds
    of SNPs differentiated between ecotypes with which we characterised 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 postzygotic barriers contributing
    to ecotype divergence and the high and variable abortion rates were marginally,
    if at all, explained by hybrid index of females.
article_processing_charge: No
author:
- first_name: Kerstin
  full_name: Johannesson, Kerstin
  last_name: Johannesson
- first_name: Zuzanna
  full_name: Zagrodzka, Zuzanna
  last_name: Zagrodzka
- first_name: Rui
  full_name: Faria, Rui
  last_name: Faria
- first_name: Anja M
  full_name: Westram, Anja M
  id: 3C147470-F248-11E8-B48F-1D18A9856A87
  last_name: Westram
  orcid: 0000-0003-1050-4969
- first_name: Roger
  full_name: Butlin, Roger
  last_name: Butlin
citation:
  ama: 'Johannesson K, Zagrodzka Z, Faria R, Westram AM, Butlin R. Data from: Is embryo
    abortion a postzygotic barrier to gene flow between Littorina ecotypes? 2019.
    doi:<a href="https://doi.org/10.5061/DRYAD.TB2RBNZWK">10.5061/DRYAD.TB2RBNZWK</a>'
  apa: 'Johannesson, K., Zagrodzka, Z., Faria, R., Westram, A. M., &#38; Butlin, R.
    (2019). Data from: Is embryo abortion a postzygotic barrier to gene flow between
    Littorina ecotypes? Dryad. <a href="https://doi.org/10.5061/DRYAD.TB2RBNZWK">https://doi.org/10.5061/DRYAD.TB2RBNZWK</a>'
  chicago: 'Johannesson, Kerstin, Zuzanna Zagrodzka, Rui Faria, Anja M Westram, and
    Roger Butlin. “Data from: Is Embryo Abortion a Postzygotic Barrier to Gene Flow
    between Littorina Ecotypes?” Dryad, 2019. <a href="https://doi.org/10.5061/DRYAD.TB2RBNZWK">https://doi.org/10.5061/DRYAD.TB2RBNZWK</a>.'
  ieee: 'K. Johannesson, Z. Zagrodzka, R. Faria, A. M. Westram, and R. Butlin, “Data
    from: Is embryo abortion a postzygotic barrier to gene flow between Littorina
    ecotypes?” Dryad, 2019.'
  ista: 'Johannesson K, Zagrodzka Z, Faria R, Westram AM, Butlin R. 2019. Data from:
    Is embryo abortion a postzygotic barrier to gene flow between Littorina ecotypes?,
    Dryad, <a href="https://doi.org/10.5061/DRYAD.TB2RBNZWK">10.5061/DRYAD.TB2RBNZWK</a>.'
  mla: 'Johannesson, Kerstin, et al. <i>Data from: Is Embryo Abortion a Postzygotic
    Barrier to Gene Flow between Littorina Ecotypes?</i> Dryad, 2019, doi:<a href="https://doi.org/10.5061/DRYAD.TB2RBNZWK">10.5061/DRYAD.TB2RBNZWK</a>.'
  short: K. Johannesson, Z. Zagrodzka, R. Faria, A.M. Westram, R. Butlin, (2019).
date_created: 2023-05-23T16:36:27Z
date_published: 2019-12-02T00:00:00Z
date_updated: 2025-07-10T11:54:22Z
day: '02'
ddc:
- '570'
department:
- _id: NiBa
doi: 10.5061/DRYAD.TB2RBNZWK
fulldoi: https://doi.org/10.5061/DRYAD.TB2RBNZWK
license: https://creativecommons.org/publicdomain/zero/1.0/
main_file_link:
- open_access: '1'
  url: https://doi.org/10.5061/dryad.tb2rbnzwk
month: '12'
oa: 1
oa_version: Published Version
publisher: Dryad
related_material:
  record:
  - id: '7205'
    relation: used_in_publication
    status: public
status: public
title: 'Data from: Is embryo abortion a postzygotic barrier to gene flow between Littorina
  ecotypes?'
tmp:
  image: /images/cc_0.png
  legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode
  name: Creative Commons Public Domain Dedication (CC0 1.0)
  short: CC0 (1.0)
type: research_data_reference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2019'
...