Data from: Towards a new understanding of migration timing: slower spring than autumn migration in geese reflects different decision rules for stopover use and departure

When using this dataset, please cite the original article.

Kölzsch A, Müskens GJDM, Kruckenberg H, Glazov P, Weinzierl R, Nolet BA, Wikelski M (2016) Towards a new understanding of migration timing: slower spring than autumn migration in geese reflects different decision rules for stopover use and departure. Oikos. doi:10.1111/oik.03121

Additionally, please cite the Movebank data package:

Kölzsch A, Kruckenberg H, Glazov P, Müskens GJDM, Wikelski M (2016) Data from: Towards a new understanding of migration timing: slower spring than autumn migration in geese reflects different decision rules for stopover use and departure. Movebank Data Repository. doi:10.5441/001/1.31c2v92f
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Package Identifier doi:10.5441/001/1.31c2v92f  
 
Abstract According to migration theory and several empirical studies, long-distance migrants are more time-limited during spring migration and should therefore migrate faster in spring than in autumn. Competition for the best breeding sites is supposed to be the main driver, but timing of migration is often also influenced by environmental factors such as food availability and wind conditions. Using GPS tags, we tracked 65 greater white-fronted geese Anser albifrons migrating between western Europe and the Russian Arctic during spring and autumn migration over six different years. Contrary to theory, our birds took considerably longer for spring migration (83 days) than autumn migration (42 days). This difference in duration was mainly determined by time spent at stopovers. Timing and space use during migration suggest that the birds were using different strategies in the two seasons: In spring they spread out in a wide front to acquire extra energy stores in many successive stopover sites (to fuel capital breeding), which is in accordance with previous results that white-fronted geese follow the green wave of spring growth. In autumn they filled up their stores close to the breeding grounds and waited for supportive wind conditions to quickly move to their wintering grounds. Selection for supportive winds was stronger in autumn, when general wind conditions were less favourable than in spring, leading to similar flight speeds in the two seasons. In combination with less stopover time in autumn this led to faster autumn than spring migration. White-fronted geese thus differ from theory that spring migration is faster than autumn migration. We expect our findings of different decision rules between the two migratory seasons to apply more generally, in particular in large birds in which capital breeding is common, and in birds that meet other environmental conditions along their migration route in autumn than in spring.
Keywords animal movement, animal tracking, Anser albifrons, Argos, avian migration, Env-DATA, GSM telemetry, Movebank, satellite telemetry, white-fronted geese,

Migration timing in white-fronted geese (data from Kölzsch et al. 2016)-argos-doppler View File Details
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Migration timing in white-fronted geese (data from Kölzsch et al. 2016)-gps View File Details
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Migration timing in white-fronted geese (data from Kölzsch et al. 2016)-reference-data View File Details
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Download: Migration timing in white-fronted geese (data from Kölzsch et al. 2016)-reference-data.csv ( 7.827Kb )
To the extent possible under law, the authors have waived all copyright and related or neighboring rights to this data.  


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