La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Increased nest predation in a declining and threatened Temminck's Stint Calidris temminckii population
Auteurs :	A. Ronka, Auteur ; K. Koivula, Auteur ; M. Ojanen, Auteur ; V. M. Pakanen, Auteur ; M. Pohjoismaki, Auteur ; K. Rannikko, Auteur ; P. Rauhala, Auteur
Type de document :	Article
Dans :	Ibis (148(1) JAN 2006)
Article en page(s) :	55-65
Résumé :	We measured nesting success of the Temminck's Stint Calidris temminckii along the Finnish Bothnian Bay coast during 19 breeding seasons (1983-2001) and conducted a population census (1999-2002). We found 105 pairs, showing a marked decline from the previous survey (170 pairs 1987-95). Of the 424 'known-fate' nests, 47% hatched. Depredation caused 79.9% of the nest losses. Nesting failures increased from 1983-91 to 1992-2001 owing to a rise in nest predation. The proportion of failed nests that failed because of predation rose from 48.9 to 87.7%. When only depredated nests were considered as losses, Mayfield nest survival probability over the incubation period dropped from 69 to 31% (461 nests). This pattern emerged both in man-made and in natural habitats. Survival probability was independent of habitat type (natural vs. man-made). In an experiment involving videotaping of dummy nests, Common Gull Larus canus and Ruddy Turnstone Arenaria interpres were found to be the most important egg predators.

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