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Social migratory connectivity: do birds that socialize in winter breed together?

Theadora A. Block, View ORCID ProfileBruce E. Lyon, Zachary Mikalonis, Alexis S. Chaine, Daizaburo Shizuka
doi: https://doi.org/10.1101/2021.12.03.471164
Theadora A. Block
1Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California, United States of America
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  • For correspondence: belyon@ucsc.edu tablock@ucsc.edu
Bruce E. Lyon
1Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California, United States of America
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  • For correspondence: belyon@ucsc.edu tablock@ucsc.edu
Zachary Mikalonis
1Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California, United States of America
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Alexis S. Chaine
2Station d’Ecologie Théorique et Expérimentale du CNRS (UMR5321), Evolutionary Ecology Group, Moulis, France
3Institute for Advanced Studies in Toulouse, Toulouse School of Economics, Toulouse, France
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Daizaburo Shizuka
4School of Biological Sciences, University of Nebraska-Lincoln, Nebraska, United States of America
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Abstract

Researching the complete life cycles of migratory animals is essential for understanding conservation and population dynamics. Many studies focus on the breeding season, but surviving winter is equally important. Living in groups during winter can play a vital role as social connections within groups can provide many benefits such as protection from predators and increased access to resources. However, it is often unknown how social connections change across seasons in migratory animals. We focus on social connections in a migratory bird and ask whether social connections in winter continue during breeding. Golden-crowned sparrows have distinct, stable winter communities which include both site and group fidelity across years: birds almost always rejoin the same social community each year. If these birds have social connectivity across migration, we would expect individuals that associate in winter would also associate together on their breeding grounds. Our small-scale GPS tagging study combined with intensive social behavior data revealed that sparrows in the same tightly-knit winter community migrated to highly disparate locations during summer, showing that social connections in winter do not continue in summer. This suggests that golden-crowned sparrows have entirely separate social structures across seasons and that long-term social memories allow them to reform stable groups each winter.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted December 03, 2021.
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Social migratory connectivity: do birds that socialize in winter breed together?
Theadora A. Block, Bruce E. Lyon, Zachary Mikalonis, Alexis S. Chaine, Daizaburo Shizuka
bioRxiv 2021.12.03.471164; doi: https://doi.org/10.1101/2021.12.03.471164
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Social migratory connectivity: do birds that socialize in winter breed together?
Theadora A. Block, Bruce E. Lyon, Zachary Mikalonis, Alexis S. Chaine, Daizaburo Shizuka
bioRxiv 2021.12.03.471164; doi: https://doi.org/10.1101/2021.12.03.471164

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