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Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species.

Publication ,  Journal Article
Hasselman, DJ; Argo, EE; McBride, MC; Bentzen, P; Schultz, TF; Perez-Umphrey, AA; Palkovacs, EP
Published in: Molecular ecology
March 2014

Most evidence for hybrid swarm formation stemming from anthropogenic habitat disturbance comes from the breakdown of reproductive isolation between incipient species, or introgression between allopatric species following secondary contact. Human impacts on hybridization between divergent species that naturally occur in sympatry have received considerably less attention. Theory predicts that reinforcement should act to preserve reproductive isolation under such circumstances, potentially making reproductive barriers resistant to human habitat alteration. Using 15 microsatellites, we examined hybridization between sympatric populations of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) to test whether the frequency of hybridization and pattern of introgression have been impacted by the construction of a dam that isolated formerly anadromous populations of both species in a landlocked freshwater reservoir. The frequency of hybridization and pattern of introgression differed markedly between anadromous and landlocked populations. The rangewide frequency of hybridization among anadromous populations was generally 0-8%, whereas all landlocked individuals were hybrids. Although neutral introgression was observed among anadromous hybrids, directional introgression leading to increased prevalence of alewife genotypes was detected among landlocked hybrids. We demonstrate that habitat alteration can lead to hybrid swarm formation between divergent species that naturally occur sympatrically, and provide empirical evidence that reinforcement does not always sustain reproductive isolation under such circumstances.

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Published In

Molecular ecology

DOI

EISSN

1365-294X

ISSN

0962-1083

Publication Date

March 2014

Volume

23

Issue

5

Start / End Page

1137 / 1152

Related Subject Headings

  • Sympatry
  • Sequence Analysis, DNA
  • North America
  • Models, Genetic
  • Microsatellite Repeats
  • Hybridization, Genetic
  • Humans
  • Genotyping Techniques
  • Genetics, Population
  • Fishes
 

Citation

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Hasselman, D. J., Argo, E. E., McBride, M. C., Bentzen, P., Schultz, T. F., Perez-Umphrey, A. A., & Palkovacs, E. P. (2014). Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species. Molecular Ecology, 23(5), 1137–1152. https://doi.org/10.1111/mec.12674
Hasselman, Daniel J., Emily E. Argo, Meghan C. McBride, Paul Bentzen, Thomas F. Schultz, Anna A. Perez-Umphrey, and Eric P. Palkovacs. “Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species.Molecular Ecology 23, no. 5 (March 2014): 1137–52. https://doi.org/10.1111/mec.12674.
Hasselman DJ, Argo EE, McBride MC, Bentzen P, Schultz TF, Perez-Umphrey AA, et al. Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species. Molecular ecology. 2014 Mar;23(5):1137–52.
Hasselman, Daniel J., et al. “Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species.Molecular Ecology, vol. 23, no. 5, Mar. 2014, pp. 1137–52. Epmc, doi:10.1111/mec.12674.
Hasselman DJ, Argo EE, McBride MC, Bentzen P, Schultz TF, Perez-Umphrey AA, Palkovacs EP. Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species. Molecular ecology. 2014 Mar;23(5):1137–1152.
Journal cover image

Published In

Molecular ecology

DOI

EISSN

1365-294X

ISSN

0962-1083

Publication Date

March 2014

Volume

23

Issue

5

Start / End Page

1137 / 1152

Related Subject Headings

  • Sympatry
  • Sequence Analysis, DNA
  • North America
  • Models, Genetic
  • Microsatellite Repeats
  • Hybridization, Genetic
  • Humans
  • Genotyping Techniques
  • Genetics, Population
  • Fishes