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Strong migratory connectivity and seasonally shifting isotopic niches in geographically separated populations of a long-distance migrating songbird

Hahn, S. and Amrhein, V. and Zehtindijev, P. and Liechti, F.. (2013) Strong migratory connectivity and seasonally shifting isotopic niches in geographically separated populations of a long-distance migrating songbird. Oecologia, Vol. 173, H. 4 , S. 1217–1225.

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Official URL: http://edoc.unibas.ch/dok/A6205634

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Abstract

Whether migratory animals use similar resources during continental-scale movements that characterize their annual cycles is highly relevant to both individual perfor- mances and population dynamics. Direct knowledge of the locations and resources used by migrants during non-breed- ing is generally scarce. Our goal was to estimate migratory connectivity of a small Palaearctic long-distance migrant, the common nightingale Luscinia megarhynchos, and to com- pare resources used in non-breeding areas with resources used at the breeding grounds. We tracked individuals of three geographically separated populations and characterised their stable isotope niches during breeding and non-breeding over 2 years. Individuals spent the non-breeding period in popu- lation-specific clusters from west to central Africa, indicat- ing strong migratory connectivity at the population level. Irrespective of origin, their isotopic niches were surprisingly similar within a particular period, although sites of residence were distant. However, niche characteristics differed mark- edly between breeding and non-breeding periods, indicat- ing a consistent seasonal isotopic niche shift in the sampled populations. Although nightingales of distinct breeding pop- ulations migrated to different non-breeding areas, they chose similar foraging conditions within specific periods. However, nightingales clearly changed resource use between breeding and non-breeding periods, indicating adaptations to changes in food availability.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Zoologie
UniBasel Contributors:Amrhein, Valentin
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Springer
ISSN:0029-8549
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:31 Jan 2014 09:50
Deposited On:31 Jan 2014 09:50

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