---
_id: '3609'
abstract:
- lang: eng
  text: Bombina bombina and B. variegata are two anciently diverged toad taxa that
    have adapted to different breeding habitats yet hybridize freely in zones of overlap
    where their parapatric distributions meet. Here, we report on a joint genetic
    and ecological analysis of a hybrid zone in the vicinity of Stryi in western Ukraine.
    We used five unlinked allozyme loci, two nuclear single nucleotide polymorphisms
    and a mitochondrial DNA haplotype as genetic markers. Parallel allele frequency
    clines with a sharp central step occur across a sharp ecotone, where transitions
    in aquatic habitat, elevation, and terrestrial vegetation coincide. The width
    of the hybrid zone, estimated as the inverse of the maximum gradient in allele
    frequency, is 2.3 km. This is the smallest of four estimates derived from different
    clinal transects across Europe. We argue that the narrow cline near Stryi is mainly
    due to a combination of habitat distribution and habitat preference. Adult toads
    show a preference for either ponds (B. bombina) or puddles (B. variegata), which
    is known to affect the distribution of genotypes within the hybrid zones. At Stryi,
    it should cause a reduction of the dispersal rate across the ecotone and thus
    narrow the cline. A detailed comparison of all five intensively studied Bombina
    transects lends support to the hypothesis that habitat distribution plus habitat
    preference can jointly affect the structure of hybrid zones and, ultimately, the
    resulting barriers to gene flow between differentiated gene pools. This study
    also represents a resampling of an area that was last studied more than 70 years
    ago. Our allele-frequency clines largely coincide with those that were described
    then on the basis of morphological variation. However, we found asymmetrical introgression
    of B. variegata genes into B. bombina territory along the bank of a river.
author:
- first_name: Alexey
  full_name: Yanchukov, Alexey
  last_name: Yanchukov
- first_name: Sebastian
  full_name: Hofman, Sebastian
  last_name: Hofman
- first_name: Jacek
  full_name: Szymura, Jacek M
  last_name: Szymura
- first_name: Sergey
  full_name: Mezhzherin, Sergey V
  last_name: Mezhzherin
- first_name: Sviatoslav
  full_name: Morozov-Leonov, Sviatoslav
  last_name: Morozov Leonov
- first_name: Nicholas H
  full_name: Nicholas Barton
  id: 4880FE40-F248-11E8-B48F-1D18A9856A87
  last_name: Barton
  orcid: 0000-0002-8548-5240
- first_name: Beate
  full_name: Nürnberger, Beate
  last_name: Nürnberger
citation:
  ama: 'Yanchukov A, Hofman S, Szymura J, et al. Hybridization of Bombina bombina
    and B. variegata (Anura, Discoglossidae) at a sharp ecotone in western Ukraine:
    comparisons across transects and over time. <i>Evolution; International Journal
    of Organic Evolution</i>. 2006;60(3):583-600. doi:<a href="https://doi.org/10.1111/j.0014-3820.2006.tb01139.x">10.1111/j.0014-3820.2006.tb01139.x</a>'
  apa: 'Yanchukov, A., Hofman, S., Szymura, J., Mezhzherin, S., Morozov Leonov, S.,
    Barton, N. H., &#38; Nürnberger, B. (2006). Hybridization of Bombina bombina and
    B. variegata (Anura, Discoglossidae) at a sharp ecotone in western Ukraine: comparisons
    across transects and over time. <i>Evolution; International Journal of Organic
    Evolution</i>. Wiley-Blackwell. <a href="https://doi.org/10.1111/j.0014-3820.2006.tb01139.x">https://doi.org/10.1111/j.0014-3820.2006.tb01139.x</a>'
  chicago: 'Yanchukov, Alexey, Sebastian Hofman, Jacek Szymura, Sergey Mezhzherin,
    Sviatoslav Morozov Leonov, Nicholas H Barton, and Beate Nürnberger. “Hybridization
    of Bombina Bombina and B. Variegata (Anura, Discoglossidae) at a Sharp Ecotone
    in Western Ukraine: Comparisons across Transects and over Time.” <i>Evolution;
    International Journal of Organic Evolution</i>. Wiley-Blackwell, 2006. <a href="https://doi.org/10.1111/j.0014-3820.2006.tb01139.x">https://doi.org/10.1111/j.0014-3820.2006.tb01139.x</a>.'
  ieee: 'A. Yanchukov <i>et al.</i>, “Hybridization of Bombina bombina and B. variegata
    (Anura, Discoglossidae) at a sharp ecotone in western Ukraine: comparisons across
    transects and over time,” <i>Evolution; International Journal of Organic Evolution</i>,
    vol. 60, no. 3. Wiley-Blackwell, pp. 583–600, 2006.'
  ista: 'Yanchukov A, Hofman S, Szymura J, Mezhzherin S, Morozov Leonov S, Barton
    NH, Nürnberger B. 2006. Hybridization of Bombina bombina and B. variegata (Anura,
    Discoglossidae) at a sharp ecotone in western Ukraine: comparisons across transects
    and over time. Evolution; International Journal of Organic Evolution. 60(3), 583–600.'
  mla: 'Yanchukov, Alexey, et al. “Hybridization of Bombina Bombina and B. Variegata
    (Anura, Discoglossidae) at a Sharp Ecotone in Western Ukraine: Comparisons across
    Transects and over Time.” <i>Evolution; International Journal of Organic Evolution</i>,
    vol. 60, no. 3, Wiley-Blackwell, 2006, pp. 583–600, doi:<a href="https://doi.org/10.1111/j.0014-3820.2006.tb01139.x">10.1111/j.0014-3820.2006.tb01139.x</a>.'
  short: A. Yanchukov, S. Hofman, J. Szymura, S. Mezhzherin, S. Morozov Leonov, N.H.
    Barton, B. Nürnberger, Evolution; International Journal of Organic Evolution 60
    (2006) 583–600.
date_created: 2018-12-11T12:04:13Z
date_published: 2006-03-01T00:00:00Z
date_updated: 2021-01-12T07:44:38Z
day: '01'
doi: 10.1111/j.0014-3820.2006.tb01139.x
extern: 1
intvolume: '        60'
issue: '3'
month: '03'
page: 583 - 600
publication: Evolution; International Journal of Organic Evolution
publication_status: published
publisher: Wiley-Blackwell
publist_id: '2774'
quality_controlled: 0
status: public
title: 'Hybridization of Bombina bombina and B. variegata (Anura, Discoglossidae)
  at a sharp ecotone in western Ukraine: comparisons across transects and over time'
type: journal_article
volume: 60
year: '2006'
...