La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Factors Affecting Nest Success of Tufted Ducks (Aythya fuligula) Nesting in Association with Black-headed Gulls (Larus ridibundus) at Loch Leven, Scotland (2015)
Auteurs :	Vasilios Liordos, Auteur ; Alan W. Lauder, Auteur
Type de document :	Article
Dans :	Waterbirds (38(2) JUN 2015)
Article en page(s) :	208-213
Résumé :	Nest success and nest-site characteristics of the Tufted Duck (Aythya fuligula) were studied during the 1996 breeding season at Loch Leven, Scotland. Approximately 463 47 Tufted Duck pairs nested in association with 6,674 805 Black-headed Gull pairs (Larus ridibundus) on St. Serfs Island. Tufted Ducks had an apparent nest success rate of 79.5% (Range: 65.8%-83.6%; n = 73). Multiple logistic regression was used to test the hypothesis that nest-site characteristics, such as distance to colony edge, overhead and vertical nest cover and distance to nearest Tufted Duck or Black-headed Gull nest, affect nest success. By using only the Tufted Duck nests with a known fate (n = 60), distance to the colony edge was identified as the primary predictor of nest success (P = 0.004), with successful nests (31.60 +/- 1.71 m) located farther from the colony edge than those that failed (18.75 +/- 2.61 m). Results support the central-periphery nest distribution model which suggests that nests located in the center of a colony, particularly in homogeneous habitats, are less accessible to predators and have greater reproductive success.

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