Migratory connectivity of Golden-crowned Sparrows from two wintering regions in California
Knowledge of migratory connectivity is critical to understanding the consequences of habitat loss and climate change on migratory species. We used light-level geolocators to determine breeding locations and migratory routes of wintering Golden-crowned Sparrows (Zonotrichia atricapilla) in two region...
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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/0b26f6559c10415e89a65a5264013134 |
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| Sumario: | Knowledge of migratory connectivity is critical
to understanding the consequences of habitat loss and
climate change on migratory species. We used light-level
geolocators to determine breeding locations and migratory
routes of wintering Golden-crowned Sparrows (Zonotrichia
atricapilla) in two regions of California, USA. Eight out of
9 birds tagged at coastal-wintering sites in Marin County
went to breeding sites along the Gulf Coast of Alaska, while
7 out of 8 inland-wintering birds in Placer County migrated
to interior sites in the Yukon, Northwest Territories, and
British Columbia, Canada. Our estimate of the strength
of migratory connectivity was relatively high (rm = 0.66).
Coastal-wintering birds followed a coastal migration route
while inland-wintering birds migrated inland. Coastalwintering
birds migrated significantly farther than inland
birds (3,624 km versus 2,442 km). Coastal birds traveled
at a greater rate during spring migration (179 km/d) than
did inland birds (118 km/d), but there was no statistical
difference in the rate of fall migration (167 km/d and
111 km/d, respectively). Dates of arrival and departure,
and duration of spring and fall migration, did not differ
between groups, nor did return rates. Rates of return
also did not differ between tagged and control birds. The
distinct migration routes and breeding areas suggests that
there may be more structuring in the migratory geography
of the Golden-crowned Sparrow than in a simple panmictic
population. |
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