Dataset

Data from: ‘Same procedure as last year?' Repeatedly tracked swifts show individual consistency in migration pattern in successive years

Wellbrock, A. H. J. (Creator), Bauch, C. (Creator), Rozman, J. (Creator), Witte, K. (Creator), University of Groningen, 3-Feb-2017

Dataset

  • Arndt H. J. Wellbrock (Creator)
  • Christina Bauch (Creator)
  • Jan Rozman (Creator)
  • Klaudia Witte (Creator)

Description

Individual migration pattern during non-breeding season is still a black box in many migratory birds. However, knowledge on both individual level and population level in migration and overwintering is fundamental to understand the life cycle of these birds and the constraints affecting them. We showed in a highly aerial migrant, the common swift Apus apus, that repeatedly tracked birds breeding at one site in Germany used the same individual-specific migration routes and wintering areas in subsequent years. In contrast, different individuals from the same breeding colony showed diverse movement patterns during non-breeding season suggesting that several suitable areas for overwintering coexist. We found lower variation in timing of autumn and spring migration within than between individuals. Our findings provide first indication of individual consistency but between-individual variation in migration pattern in a small non-passerine bird revealed by geolocators. This supports that swifts have diverse but individual-specific ‘step-by-step’ migration patterns revealing high flexibility through individual strategies.

The data package contains two datasets:
- PERMANOVA_data_within-analysis
This file includes geolocation data of repeatedly tracked individuals for permutational multivariate analysis of variance.

- PERMANOVA_data_between-analysis
This file includes geolocation data of singly tracked individuals for permutational multivariate analysis of variance.

Two data sets were examined: 1) one data set for the analysis of within-individual variation and 2) another data set for the analysis of between-indi-vidual variation. The ‘within’-data set consisted of the six tracks of the three repeatedly tracked individuals. Each first track of the two males ‘5907’ and ‘6000’ was shortened to the length of the second ending at the same Julian date because the second track of these males was not repeated completely. The ‘between’-data set included the tracks of the seven singly tracked individuals plus the first entire track of the three repeatedly tracked individuals (n  10). For the ‘within’-analysis, we used ‘track’ (coded as first or second) as explanatory variable in the test and ‘individual’ as cofactor. In the ‘between’-analysis, we applied ‘individ-ual’ as explanatory variable.
Date made available3-Feb-2017
PublisherUniversity of Groningen
Geographical coverageGermany
Access to the dataset Open
Contact researchdata@rug.nl

    Keywords on Datasets

  • repeated tracking, migratory birds, geolocator, Common Swift, Apus apus
Related Publications
  1. 'Same procedure as last year?': Repeatedly tracked swifts show individual consistency in migration pattern in successive years

    Wellbrock, A. H. J., Bauch, C., Rozman, J. & Witte, K., Jun-2017, In : Journal of Avian Biology. 48, 6, p. 897-903 7 p.

    Research output: Contribution to journalArticleAcademicpeer-review

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