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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Differences in foraging behaviour of a migrating shorebird at stopover sites on regulated and unregulated sections of a large European lowland river (2022)
Auteurs :	Radosław Kozik, Auteur ; Włodzimierz Meissner, Auteur ; Bartosz Listewnik, Auteur ; Jacek Nowicki, Auteur ; Robert Lasecki, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (163(3) July, 2022)
Article en page(s) :	791-802
Langues:	Anglais
Mots-clés:	Common Ringed Plover ; Food resources ; River development ; Vistula River ; Włocławek Dam
Résumé :	River development and dam construction alter ecological conditions by changing geomorphologic processes affecting the nutrient and biogeochemical cycles in riverine ecosystems. Changes to the food chain might thus harm the quality of migratory shorebirds’ stopover sites. In this study we compare the abundance of potential prey and the foraging behaviour of migrating adult and juvenile Common Ringed Plovers in autumn at unregulated and regulated stretches of the Vistula River, an important stopover site for migrant shorebirds. We collected invertebrates from the substrate’s surface and the top 3 cm. We also observed the birds’ foraging behaviour, noting characteristic feeding techniques, such as pecking, probing and foot trembling; foraging intensity; distance between foraging individuals, and the number of aggressive interactions. The lower abundance of invertebrates in the regulated section below the Włocławek Dam extended the plovers’ foraging times and required more pecks per minute for them to meet their energy requirements. The confined foraging habitat of the regulated river forced the migrants to gather closer than on the unregulated section, causing more intraspecific aggression. Nevertheless, worse foraging conditions in the Vistula’s regulated section affected only the inexperienced juvenile Ringed Plovers migrating for the first time. Our study shows that the river below the dam offers less potential prey for migrating shorebirds than the semi-natural section above the dam. Lower quality stopover sites may reduce juvenile plovers’ prospects of successful migration, because the rate of fat deposition in migratory shorebirds is related to conditions at stopover habitats, which also affect their speed of migration.
En ligne :	https://doi.org/10.1007/s10336-022-01984-3

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