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1 December 2011 How Many Aquatic Warblers Acrocephalus paludicola Stop Over in France during the Autumn Migration?
Frédéric Jiguet, François Chiron, Olivier Dehorter, Hubert Dugué, Pascal Provost, Raphaël Musseau, Gaétan Guyot, Franck Latraube, Philippe Fontanilles, Emmanuel Séchet, Julien Laignel, Xavier Gruwier, Arnaud Le Nevé
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Abstract

The autumn world population of the endangered Aquatic Warbler Acrocephalus paludicola probably numbers between 23 000 and 69 000 individuals, including 5 000 to 44 000 first-year individuals, depending on variation in breeding success and post-fledging survival. After breeding, the species migrates as early as August along a westerly route along French coast to reach its African wintering grounds. In 2009, French ringers have carried out targeted mist-netting to enhance the capture of the species, using tape luring in suitable habitats. Overall, 874 different individuals were captured in France in that year. In 2010 similar ringing effort allowed the capture of 646 different individuals. From this ringing information, we propose a simple method to estimate the number of individuals which stopped in the country during the autumn migration, considering all birds or first-years only. Splitting the country in two parts (northern and southern), the method uses the total number of captures and the number of southern recaptures of birds first ringed in the north. Overall, we estimated that between 24 000 and 30 000 individuals — most of them in their first calendar year — stop in France each year during the fall migration. These estimates suggest that probably all first-year Aquatic Warblers migrate by this western flyway and stop in France to refuel, while adults may partly use a different flyway or may stop in France, but for shorter times or at fewer sites. The proposed figures highlight the importance of maintaining suitable refuelling habitats for the species all along coastal France.

Frédéric Jiguet, François Chiron, Olivier Dehorter, Hubert Dugué, Pascal Provost, Raphaël Musseau, Gaétan Guyot, Franck Latraube, Philippe Fontanilles, Emmanuel Séchet, Julien Laignel, Xavier Gruwier, and Arnaud Le Nevé "How Many Aquatic Warblers Acrocephalus paludicola Stop Over in France during the Autumn Migration?," Acta Ornithologica 46(2), 135-142, (1 December 2011). https://doi.org/10.3161/000164511X625900
Received: 1 July 2011; Accepted: 1 November 2011; Published: 1 December 2011
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KEYWORDS
Acrocephalus paludicola
capture effort
recaptures
refuel
ringing
stopover
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