Departure directions, migratory timing and non-breeding distribution of the Red-backed Shrike Lanius collurio: do ring reencounters and light-based geolocator data tell the same story?

Fränzi Korner-Nievergelt; Lukas Jenni; Anders Peter Them Tøttrup; Gilberto Pasinelli

doi:10.1080/03078698.2012.748508

Departure directions, migratory timing and non-breeding distribution of the Red-backed Shrike Lanius collurio: do ring reencounters and light-based geolocator data tell the same story?

Fränzi Korner-Nievergelt, Lukas Jenni, Anders Peter Them Tøttrup, Gilberto Pasinelli

Ecology and Evolution

9 Citations (Scopus)

Abstract

This study explores differences and consistencies between ring re-encounter and light-based geolocator data from Red-backed Shrike when used for studying three aspects of bird migration: departure direction and its relationship with longitude and latitude, non-breeding distribution, and timing of migration. Departure directions were consistent between the Iwo methods. They indicate a funnel-shaped migration with individuals from southwest Europe taking a detour via the eastern Mediterranean rather than migrating via Gibraltar. This indicates that an original migration route has been retained after colonisation of the breeding range. Non-breeding distributions differed substantially between birds ringed and re-encountered and birds tracked by geolocators. This difference may be due to spatiotemporal heterogeneity in ring re-encounter probability and/or due to the two samples of birds belonging to different populations. The monthly average ring re-encounter location moved later southward during autumn and earlier northward during spring migration than the geolocator positions, because of an over-representation of re-encounters in the north. The results emphasise the importance of combining different sources of data when analysing migration patterns of animals that are difficult to track.

Original language	English
Journal	Ringing & migration
Volume	27
Issue number	2
Pages (from-to)	83–93
Number of pages	11
ISSN	0307-8698
DOIs	https://doi.org/10.1080/03078698.2012.748508
Publication status	Published - Dec 2012

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Departure directions, migratory timing and non-breeding distribution of the Red-backed Shrike Lanius collurio: do ring reencounters and light-based geolocator data tell the same story? / Korner-Nievergelt, Fränzi; Jenni, Lukas; Tøttrup, Anders Peter Them et al.
In: Ringing & migration, Vol. 27, No. 2, 12.2012, p. 83–93.

Research output: Contribution to journal › Journal article › Research › peer-review

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title = "Departure directions, migratory timing and non-breeding distribution of the Red-backed Shrike Lanius collurio: do ring reencounters and light-based geolocator data tell the same story?",

abstract = "This study explores differences and consistencies between ring re-encounter and light-based geolocator data from Red-backed Shrike when used for studying three aspects of bird migration: departure direction and its relationship with longitude and latitude, non-breeding distribution, and timing of migration. Departure directions were consistent between the Iwo methods. They indicate a funnel-shaped migration with individuals from southwest Europe taking a detour via the eastern Mediterranean rather than migrating via Gibraltar. This indicates that an original migration route has been retained after colonisation of the breeding range. Non-breeding distributions differed substantially between birds ringed and re-encountered and birds tracked by geolocators. This difference may be due to spatiotemporal heterogeneity in ring re-encounter probability and/or due to the two samples of birds belonging to different populations. The monthly average ring re-encounter location moved later southward during autumn and earlier northward during spring migration than the geolocator positions, because of an over-representation of re-encounters in the north. The results emphasise the importance of combining different sources of data when analysing migration patterns of animals that are difficult to track.",

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AU - Korner-Nievergelt, Fränzi

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N2 - This study explores differences and consistencies between ring re-encounter and light-based geolocator data from Red-backed Shrike when used for studying three aspects of bird migration: departure direction and its relationship with longitude and latitude, non-breeding distribution, and timing of migration. Departure directions were consistent between the Iwo methods. They indicate a funnel-shaped migration with individuals from southwest Europe taking a detour via the eastern Mediterranean rather than migrating via Gibraltar. This indicates that an original migration route has been retained after colonisation of the breeding range. Non-breeding distributions differed substantially between birds ringed and re-encountered and birds tracked by geolocators. This difference may be due to spatiotemporal heterogeneity in ring re-encounter probability and/or due to the two samples of birds belonging to different populations. The monthly average ring re-encounter location moved later southward during autumn and earlier northward during spring migration than the geolocator positions, because of an over-representation of re-encounters in the north. The results emphasise the importance of combining different sources of data when analysing migration patterns of animals that are difficult to track.

AB - This study explores differences and consistencies between ring re-encounter and light-based geolocator data from Red-backed Shrike when used for studying three aspects of bird migration: departure direction and its relationship with longitude and latitude, non-breeding distribution, and timing of migration. Departure directions were consistent between the Iwo methods. They indicate a funnel-shaped migration with individuals from southwest Europe taking a detour via the eastern Mediterranean rather than migrating via Gibraltar. This indicates that an original migration route has been retained after colonisation of the breeding range. Non-breeding distributions differed substantially between birds ringed and re-encountered and birds tracked by geolocators. This difference may be due to spatiotemporal heterogeneity in ring re-encounter probability and/or due to the two samples of birds belonging to different populations. The monthly average ring re-encounter location moved later southward during autumn and earlier northward during spring migration than the geolocator positions, because of an over-representation of re-encounters in the north. The results emphasise the importance of combining different sources of data when analysing migration patterns of animals that are difficult to track.

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DO - 10.1080/03078698.2012.748508

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Departure directions, migratory timing and non-breeding distribution of the Red-backed Shrike Lanius collurio: do ring reencounters and light-based geolocator data tell the same story?

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