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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Studies on chick survival of Curlew Numenius arquata and Lapwing Vanellus vanellus by radio-telemetry in SPA Dusterdieker Niederung (2008)
Auteurs :	Bettina Hoenisch, Auteur ; Christoph Artmeyer, Auteur ; Johannes Melter, Auteur ; Robert Tuellinghoff, Auteur
Type de document :	Article
Dans :	Vogelwarte (46(1) FEB 2008)
Article en page(s) :	39-48
Langues:	Allemand
Résumé :	The paper presents results of a study on chick survival by radio-tracking which was carried out in the grassland of SPA Dusterdieker Niederung (Northrhine-Westphalia, Germany) in 2005 and 2006. During the study 34 Lapwing chicks (from 14 broods) and 58 Curlew chicks (20 broods) were fitted with 0,8 g radio-tags on the back. Curlews were tagged within the first two days after hatching whereas Lapwings were also tagged up to an age of two weeks. The tags were located at least every three days to determine the fate of the chicks. If they survived, chicks were recaptured at an age of about 30 days, to remove the radio tags. There was no negative effect of radio-tagging for the survival of chicks. Untagged chicks did not show a higher survival than tagged birds. Observations of the behaviour of chicks and families support this result. 35% of tagged Lapwing chicks and 28% of Curlews survived to an age of 30 days. At least 38% of Lapwing chicks and 24% of Curlews were predated. For Curlews we found higher portion of predation by mammals, for Lapwing more avian predators. Chicks were definitely predated by Common Buzzard (5), Common Kestrel (1), Little Owl (1), unknown avian predators (4), Fox (1), Mustelidae (11), unknown mammals (3), other unknown predator (1). About 20% of tags for Lapwing and 46% for Curlew could not be recovered, although it was known that the birds must have died. It can be supposed that a high portion of these losses is also caused by predation. Only a single Lapwing chick died through agricultural measures on the fields. One chick of each species drowned in ditches (the same fate had the only chick of Black-tailed Godwit which was tagged in this study). About 70% of chick losses of Curlews fell on the first 14 days of age. Results are discussed also with respect to improving conservation measures in the SPA (e.g. management of ditches). Small amount of chick losses by farming practice can be seen as success of the conservation measures. Actually, predation seems not to be a very conspicuous problem for chick survival in the "Dusterdieker Niederung".

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