Journal of Ornithology

, Volume 151, Issue 4, pp 945–950 | Cite as

A new exploratory approach to the study of the spatio-temporal distribution of ring recoveries: the example of Teal (Anas crecca) ringed in Camargue, Southern France

  • Clément CalengeEmail author
  • Matthieu Guillemain
  • Michel Gauthier-Clerc
  • Géraldine Simon
Original Article


We use a new method called “product kernel estimator” to explore the spatial and temporal distribution of 9,114 recoveries of Teal (Anas crecca) ringed in Camargue, southern France, and recovered over the whole of Europe. This method allows exploration of the changes in time of the probability density to recover a ringed bird over a grid covering the study area. We thus identified two migration corridors for this species to the north and south of the Alps, whereas earlier analyses mostly suggested a southern route from Camargue, especially in spring. The northern route seems to be used to a greater extent in autumn than in spring, indicating a frequent abmigration (animals switching from one corridor to the other). Moreover, migration of the population seems faster in spring than in autumn. The simultaneous presence of Teal recoveries in many distinct geographical areas in spring is consistent with the idea that these ducks are not limited by their migratory speed in spring, nor do they wait until favorable environmental conditions before colonizing their breeding areas.


Product kernel algorithm Spatial distribution Time effect Eurasian Teal Ring recoveries 



We are most grateful to Luc Hoffmann, Hubert Kowalski, Heinz Hafner, Alan Johnson, and the other people who ringed Teal at Tour du Valat for over 25 years. We would especially like to thank Marc Lutz, Paul Isenmann and the Centre de Recherche sur la Biologie des Populations d’Oiseaux (Muséum National d’Histoire Naturelle, Paris) for their help while computerizing the French Teal database. This work was partially funded by the French “Agence Nationale de la Recherche” (ANR) “Santé-Environnement/Santé au travail”, the “European Union’s Framework Program for Research and Technological Development (FP6)” and the “Région Provence-Alpes-Côte d’Azur”.

Supplementary material

10336_2010_534_MOESM1_ESM.pdf (83 kb)
Supplementary material 1 (PDF 83 kb)

Supplementary material 2 (AVI 876 kb)

Supplementary material 3 (AVI 773 kb)

10336_2010_534_MOESM4_ESM.pdf (5 kb)
Supplementary material 4 (PDF 5 kb)
10336_2010_534_MOESM5_ESM.pdf (5 kb)
Supplementary material 5(PDF 4 kb)


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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2010

Authors and Affiliations

  • Clément Calenge
    • 1
    Email author
  • Matthieu Guillemain
    • 2
  • Michel Gauthier-Clerc
    • 3
  • Géraldine Simon
    • 3
  1. 1.Office National de la Chasse et de la Faune Sauvage, Direction des Etudes et de la RechercheAuffargisFrance
  2. 2.Office National de la Chasse et de la Faune SauvageCNERA Avifaune MigratriceArlesFrance
  3. 3.Centre de Recherche de la Tour du ValatArlesFrance

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