Migratory orientation in a narrow avian hybrid zone

David P.L. Toews, Kira E. Delmore, Matthew M. Osmond, Philip D. Taylor, Darren E. Irwin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background. Zones of contact between closely related taxa with divergent migratory routes, termed migratory divides, have been suggested as areas where hybrid offspring may have intermediate and inferior migratory routes, resulting in low fitness of hybrids and thereby promoting speciation. In the Rocky Mountains of Canada there is a narrow hybrid zone between Audubon's and myrtle warblers that is likely maintained by selection against hybrids. Band recoveries and isotopic studies indicate that this hybrid zone broadly corresponds to the location of a possible migratory divide, with Audubon's warblers migrating south-southwest and myrtle warblers migrating southeast.Wetested a key prediction of the migratory divide hypothesis: that genetic background would be predictive of migratory orientation among warblers in the center of the hybrid zone. Methods. We recorded fall migratory orientation of wild-caught migrating warblers in the center of the hybrid zone as measured by video-based monitoring of migratory restlessness in circular orientation chambers. We then tested whether there was a relationship between migratory orientation and genetic background, as measured using a set of species-specific diagnostic genetic markers. Results. We did not detect a significant association between orientation and genetic background. There was large variation among individuals in orientation direction. Mean orientation was towards the NE, surprising for birds on fall migration, but aligned with the mountain valley in which the study took place. Conclusions. Only one other study has directly analyzed migratory orientation among naturally-produced hybrids in a migratory divide. While the other study showed an association between genetic background and orientation, we did not observe such an association in yellow-rumped warblers. We discuss possible reasons, including the possibility of a lack of a strong migratory divide in this hybrid zone and/or methodological limitations that may have prevented accurate measurements of longdistance migratory orientation.

Original languageEnglish (US)
Article number3201
JournalPeerJ
Volume2017
Issue number4
DOIs
StatePublished - Jan 1 2017

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Birds
Songbirds
Recovery
Monitoring
genetic background
Myrtus
Myrtus communis
Direction compound
Psychomotor Agitation
Rocky Mountain region
Genetic Markers
Canada
valleys
mountains
genetic markers
prediction
Genetic Background
monitoring
birds

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Toews, D. P. L., Delmore, K. E., Osmond, M. M., Taylor, P. D., & Irwin, D. E. (2017). Migratory orientation in a narrow avian hybrid zone. PeerJ, 2017(4), [3201]. https://doi.org/10.7717/peerj.3201
Toews, David P.L. ; Delmore, Kira E. ; Osmond, Matthew M. ; Taylor, Philip D. ; Irwin, Darren E. / Migratory orientation in a narrow avian hybrid zone. In: PeerJ. 2017 ; Vol. 2017, No. 4.
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abstract = "Background. Zones of contact between closely related taxa with divergent migratory routes, termed migratory divides, have been suggested as areas where hybrid offspring may have intermediate and inferior migratory routes, resulting in low fitness of hybrids and thereby promoting speciation. In the Rocky Mountains of Canada there is a narrow hybrid zone between Audubon's and myrtle warblers that is likely maintained by selection against hybrids. Band recoveries and isotopic studies indicate that this hybrid zone broadly corresponds to the location of a possible migratory divide, with Audubon's warblers migrating south-southwest and myrtle warblers migrating southeast.Wetested a key prediction of the migratory divide hypothesis: that genetic background would be predictive of migratory orientation among warblers in the center of the hybrid zone. Methods. We recorded fall migratory orientation of wild-caught migrating warblers in the center of the hybrid zone as measured by video-based monitoring of migratory restlessness in circular orientation chambers. We then tested whether there was a relationship between migratory orientation and genetic background, as measured using a set of species-specific diagnostic genetic markers. Results. We did not detect a significant association between orientation and genetic background. There was large variation among individuals in orientation direction. Mean orientation was towards the NE, surprising for birds on fall migration, but aligned with the mountain valley in which the study took place. Conclusions. Only one other study has directly analyzed migratory orientation among naturally-produced hybrids in a migratory divide. While the other study showed an association between genetic background and orientation, we did not observe such an association in yellow-rumped warblers. We discuss possible reasons, including the possibility of a lack of a strong migratory divide in this hybrid zone and/or methodological limitations that may have prevented accurate measurements of longdistance migratory orientation.",
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Toews, DPL, Delmore, KE, Osmond, MM, Taylor, PD & Irwin, DE 2017, 'Migratory orientation in a narrow avian hybrid zone', PeerJ, vol. 2017, no. 4, 3201. https://doi.org/10.7717/peerj.3201

Migratory orientation in a narrow avian hybrid zone. / Toews, David P.L.; Delmore, Kira E.; Osmond, Matthew M.; Taylor, Philip D.; Irwin, Darren E.

In: PeerJ, Vol. 2017, No. 4, 3201, 01.01.2017.

Research output: Contribution to journalArticle

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N2 - Background. Zones of contact between closely related taxa with divergent migratory routes, termed migratory divides, have been suggested as areas where hybrid offspring may have intermediate and inferior migratory routes, resulting in low fitness of hybrids and thereby promoting speciation. In the Rocky Mountains of Canada there is a narrow hybrid zone between Audubon's and myrtle warblers that is likely maintained by selection against hybrids. Band recoveries and isotopic studies indicate that this hybrid zone broadly corresponds to the location of a possible migratory divide, with Audubon's warblers migrating south-southwest and myrtle warblers migrating southeast.Wetested a key prediction of the migratory divide hypothesis: that genetic background would be predictive of migratory orientation among warblers in the center of the hybrid zone. Methods. We recorded fall migratory orientation of wild-caught migrating warblers in the center of the hybrid zone as measured by video-based monitoring of migratory restlessness in circular orientation chambers. We then tested whether there was a relationship between migratory orientation and genetic background, as measured using a set of species-specific diagnostic genetic markers. Results. We did not detect a significant association between orientation and genetic background. There was large variation among individuals in orientation direction. Mean orientation was towards the NE, surprising for birds on fall migration, but aligned with the mountain valley in which the study took place. Conclusions. Only one other study has directly analyzed migratory orientation among naturally-produced hybrids in a migratory divide. While the other study showed an association between genetic background and orientation, we did not observe such an association in yellow-rumped warblers. We discuss possible reasons, including the possibility of a lack of a strong migratory divide in this hybrid zone and/or methodological limitations that may have prevented accurate measurements of longdistance migratory orientation.

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Toews DPL, Delmore KE, Osmond MM, Taylor PD, Irwin DE. Migratory orientation in a narrow avian hybrid zone. PeerJ. 2017 Jan 1;2017(4). 3201. https://doi.org/10.7717/peerj.3201