Strong Migratory Connectivity in a Declining Arctic Passerine
Determining how animal populations are linked in space and time is important for identifying factors influencing population dynamics and for effective conservation and management. Arctic-breeding migratory passerines are declining and at risk due to forecasted climate change, but are a challenge to...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
De Gruyter
2012
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/c3c169aa536a407b9ba186c08a0ca69e |
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| Sumario: | Determining how animal populations are linked in space and time is
important for identifying factors influencing population dynamics and
for effective conservation and management. Arctic-breeding migratory
passerines are declining and at risk due to forecasted climate change, but
are a challenge to monitor due to their inaccessible breeding locations,
long-distance migration routes and small body size. For the first time, we
combine sub-gram geolocator technology and stable-isotope analysis with
mark-recapture (banding) and citizen science data to determine patterns
of migratory connectivity for multiple populations of a declining North
American Arctic-breeding passerine, snow bunting (Plectrophenax nivalis).
We show strong evidence for an east-west parallel migratory system, with
Hudson Bay acting as a migratory divide. While band recoveries suggest
strong migratory connectivity among eastern wintering populations
(more than 95% of band recoveries reveal connections between western
Greenland and eastern North America), novel application of geolocators
and stable-hydrogen isotope analysis to a Canadian breeding population
revealed a high degree of migratory connectivity within western North
American wintering populations. Our results also show distinct differences
in migratory distance between eastern and western populations, and
illustrate how applying multiple techniques can effectively be used to track
migration patterns of remote populations. Differences in annual distribution
and migratory distance suggest that separate consideration of eastern
and western wintering populations may improve future conservation and
management efforts for this species. |
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