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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Analysis of nest losses of the Eurasian Curlew Numenius arquata in the Upper Rhine Valley of Baden - a comparison between results from 2000-2002 and former periods with focus on predation.
Auteurs :	Martin Boschert, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (126(4) 2005)
Article en page(s) :	321-332
Résumé :	Studies on Curlew biology were carried out during the breeding season 2000-2002 and compared with results from studies since the mid 1980s in several breeding areas (plains of the rivers Elz, Kammbach, Rench and Acher) in the Upper Rhine Valley (Baden-Wurttemberg, Germany). The different reasons for nest losses were determined by direct and continuous observation of the nests and families. Since 2000, in 55 out of 97 nests so-called thermo loggers were used; in I I of these nests chicks hatched. 44 (55%) were robbed during night, 11 (25%) during daylight. In the study areas significant differences were found between the Elz plains and the other plains. The reasons for nest losses in 2000-2002 were similar in all breeding areas. Most important was predation (44 nests = 56%). Out of 79 nests, only in I I chicks hatched (14%). The reasons for nest losses have changed significantly over time. Predation rates have increased in all regions. The Red Fox was identified as the main egg predator (18 nests = 23%) and was also responsible for nine nest losses (64%) during daylight; corvids and other birds apparently were not significantly involved. Loss of clutches to crows in the past was supported by human disturbance. Conservation measures have greatly reduced the impact of other factors formerly responsible for nest loss. In occasional years, bad weather has caused major nest loss. The hatching rate differed between years and between areas, but decreased significantly in the Elz plains during the 1990s. The fledging rate decreased significantly in the Elz and Rench plains.

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