La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Population-wide body mass increment at stopover sites is an unreliable indicator of refuelling rates in migrating waders
Auteurs :	Piotr Minias, Auteur ; Krzysztof Kaczmarek, Auteur
Type de document :	Article
Dans :	Ibis (155(1) JAN 2013)
Article en page(s) :	102-112
Résumé :	Estimates of refuelling rates in migrating waders are best based on intra-seasonal recaptures of individually marked birds. This method, however, has methodological problems associated with capture effects and difficulties in attaining sufficient sample sizes. An alternative method had been proposed whereby refuelling rates are approximated by the body mass increment from the slope of the regression between body masses of all birds caught at a site and date. We investigated the appropriateness of this indicator with a simulation study in non-synchronized migratory species (i.e. arrivals and departures of individuals at the stopover site are not synchronized). Simulation results indicated that the mass increment across the population may be used as an approximation of refuelling rate only in populations with low turnover rates (percentage of birds arriving at/departing from stopover site per day

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