Band recoveries reveal alternative migration strategies in American Robins
Migration strategies may change in response to climate change with consequences for conservation efforts. We used 80 years (1934−2014) of band recovery data (N = 1,057) to describe spatial and temporal patterns in the migration behavior of American Robins. The distribution of recoveries suggests str...
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| Autores principales: | , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
De Gruyter
2016
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/2771fc0e2cf64c92a43ac8aacd5a6934 |
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| Sumario: | Migration strategies may change in response
to climate change with consequences for conservation
efforts. We used 80 years (1934−2014) of band recovery
data (N = 1,057) to describe spatial and temporal patterns
in the migration behavior of American Robins. The
distribution of recoveries suggests strong continental scale
connectivity with distinct separation between eastern and
western North America, with a more moderate degree of
connectivity within these regions. We also found little
evidence of differential migration between males and
females. Despite previous studies that suggest the winter
distribution of robins has shifted northward, our analysis
shows no obvious change in migration distance over time.
Surprisingly, we found that a significant proportion of
across season band recoveries occurred locally (20%), in
close proximity to the original banding locations. It’s well
known that large numbers of robins linger in northern
breeding grounds well into the winter of some years, but the
proximity of these birds to breeding areas was previously
unknown. We found little evidence that the winter latitude
of migrants or local recoveries shifted over time. However,
there was a trend for increased frequency of local recoveries
in recent decades, providing an alternative hypothesis for
the northward shift in winter distribution. |
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