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Dryad

Social connections across migration: Do Golden-crowned sparrows (Zonotrichia atricapilla) that socialize in winter also breed together?

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Dec 20, 2023 version files 302.17 KB

Abstract

Here, we study migratory golden-crowned sparrows with distinct, stable winter communities. The sparrows have winter site and group fidelity across years, and birds almost always rejoin the same social community each year. Sparrows in the same tightly-knit community migrated to highly disparate locations during summer, showing that social connections in winter do not continue in summer. We provide initial evidence that the birds have entirely separate social structures across seasons with long-term social memories allowing them to reform stable groups each winter. Our research uncovers a new pattern in this model system that could apply to other migratory animals.