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Titre :
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A population survey of the endangered White-headed Duck Oxyura leucocephala in Kazakhstan shows an apparently increasing Eastern population (2019)
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Auteurs :
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Alyona I. Koshkina, Auteur ;
Alexey V. Koshkin, Auteur ;
Alexey Y. Timoshenko, Auteur ;
Artyom A. Koshkin, Auteur ;
Holger Schielzeth, Auteur
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Type de document :
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Article
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Dans :
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Bird Study (66(1) January, 2019)
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Article en page(s) :
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111-120
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Mots-clés:
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Central Asia
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Wetland conservation
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population trends
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waterbird migration
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white-headed Duck
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Résumé :
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CapsuleSurveys of the White-headed Duck Oxyura leucocephala at key breeding and staging sites in Kazakhstan suggest a positive trend for the migratory Eastern population and an underestimation of the global population.AimsTo review and update the population estimate and distribution status of the White-headed Duck in Kazakhstan using the most recent survey data.MethodsDistribution and population estimates were derived from a compilation of all published and unpublished data and a series of targeted surveys in 2013–17, covering breeding, post-breeding and migration periods at key sites in north-central Kazakhstan.ResultsNumbers of White-headed Ducks were particularly high in the post-breeding and autumn migration period. There was a positive population trend across the past two decades, including high counts in 2016 and 2017, with more than 20 000 and about 7500 individuals, respectively, suggesting a population increase. Breeding records were scattered and overall low in numbers, but likely partly overlooked.ConclusionThe global population size of the White-headed Duck is currently considerably underestimated. The positive trend reflects the overall improvement in the status of the Eastern population. However, aggregation at relatively few sites represent a potential conservation concern. The breeding sites that are a source for the migratory aggregations in north-central Kazakhstan are still to be discovered.
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En ligne :
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https://doi.org/10.1080/00063657.2019.1618239
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