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Migratory double breeding in Neotropical migrant birds

Sievert Rohwer, Keith A. Hobson, and Vanya G. Rohwer
PNAS published ahead of print October 26, 2009 https://doi.org/10.1073/pnas.0908121106
Sievert Rohwer
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Keith A. Hobson
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Vanya G. Rohwer
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  1. Edited by Gordon H. Orians, University of Washington, Seattle, WA, and approved September 23, 2009 (received for review July 20, 2009)

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Abstract

Neotropical migratory songbirds typically breed in temperate regions and then travel long distances to spend the majority of the annual cycle in tropical wintering areas. Using stable-isotope methodology, we provide quantitative evidence of dual breeding ranges for 5 species of Neotropical migrants. Each is well known to have a Neotropical winter range and a breeding range in the United States and Canada. However, after their first bout of breeding in the north, many individuals migrate hundreds to thousands of kilometers south in midsummer to breed a second time during the same summer in coastal west Mexico or Baja California Sur. They then migrate further south to their final wintering areas in the Neotropics. Our discovery of dual breeding ranges in Neotropical migrants reveals a hitherto unrealized flexibility in life-history strategies for these species and underscores that demographic models and conservation plans must consider dual breeding for these migrants.

  • dual breeding
  • isotopes
  • itinerant breeding
  • west Mexico

Footnotes

  • 1To whom correspondence should be addressed. E-mail: rohwer{at}u.washington.edu
  • Author contributions: S.R., K.A.H., and V.G.R. designed research; S.R., K.A.H., and V.G.R. performed research; S.R. and V.G.R. analyzed data; and S.R., K.A.H., and V.G.R. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission.

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Migratory double breeding in Neotropical migrant birds
Sievert Rohwer, Keith A. Hobson, Vanya G. Rohwer
Proceedings of the National Academy of Sciences Oct 2009, pnas.0908121106; DOI: 10.1073/pnas.0908121106

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Migratory double breeding in Neotropical migrant birds
Sievert Rohwer, Keith A. Hobson, Vanya G. Rohwer
Proceedings of the National Academy of Sciences Oct 2009, pnas.0908121106; DOI: 10.1073/pnas.0908121106
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