Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
The paradox of spoonbill migration: most birds travel to where survival rates are lowest
Lok, T.; Overdijk, O.; Tinbergen, J.M.; Piersma, T. (2011). The paradox of spoonbill migration: most birds travel to where survival rates are lowest. Anim. Behav. 82(4): 837-844. dx.doi.org/10.1016/j.anbehav.2011.07.019
In: Animal Behaviour. Academic Press: London,. ISSN 0003-3472; e-ISSN 1095-8282, meer
|  |
| Trefwoord |
Platalea leucorodia leucorodia
|
| Author keywords |
age-differential migration; behavioural plasticity; Eurasian spoonbill;exploratory behaviour; intraspecific competition; movement; optimalmigration; Platalea leucorodia leucorodia; winter philopatry |
| Auteurs | | Top |
- Lok, T.
- Overdijk, O.
- Tinbergen, J.M.
- Piersma, T., meer
|
|
|
| Abstract |
Migrant birds face a choice where to spend the winter. Presumably there is a trade-off between migration distance (costs) and the quality of the wintering site (benefits). Wintering site fidelity is often high and increases with age. Hypotheses to explain such a pattern assume that wintering site choice maximizes fitness. We compared wintering site choice and age-dependent site fidelity in Eurasian spoonbills, Platalea leucorodia leucorodia, for the period 1992-2010. During their first southward migration, most spoonbills migrated to the southernmost wintering region (Mauritania and Senegal). Other birds were likely to move there from their first to their second winter, whereas hardly any birds moved to a more northerly wintering area. For the rest of their life, spoonbills remained highly site faithful. This resulted in most birds wintering in Mauritania and Senegal with smaller numbers in France and Iberia. We judged suitability of sites on the basis of annual survival probabilities in these three wintering areas. Surprisingly, survival was lowest in Mauritania and Senegal. None of the existing fitness maximization hypotheses explain this pattern and we discuss potential alternatives. Wintering site choice could still be optimal for individual birds if birds wintering in Mauritania and Senegal are competitively inferior to the European winterers or more susceptible to severe winter weather. Alternatively, wintering site choice of spoonbills is suboptimal and, assuming that spoonbills can assess differences in suitability, limited flexibility may prevent them from switching to more suitable sites. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
