Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	Saltmarsh as habitat of common Redshanks Tringa totanus breeding in the Wadden Sea of lower saxony, Germany: useful hideaway or ecological trap? (2008)
Auteurs :	Stefan Thyen, Auteur ; Klaus-Michael Exo, Auteur ; Anja Cervencl, Auteur ; Wiebke Esser, Auteur ; Nadine Oberdiek, Auteur
Type de document :	Article
Dans :	Vogelwarte (46(2) MAY 2008)
Article en page(s) :	121-130
Langues:	Allemand
Résumé :	In contrast to most other European breeding sites, the breeding population of the Redshank Tringa totanus in the European Wadden Sea is stable in most areas of the ecosystem. As suggested by recent studies on hatching success, however, Redshank reproduction is spatially variable and cannot reliably explain the population trend mentioned above. From 2004 to 2006, a telemetry study on Redshank chicks was conducted in Petersgroden (mainland) and on the island of Wangerooge to record annual breeding success and its spatial variability and to derive predictions on future population trends. Due to lower predation, birds on Wangerooge achieved considerably higher hatching success than birds at the mainland (2005/06: 64 and 93 of clutches vs. 4 to 15 %, 2004-2005). Apart from total losses due to weather conditions in 2004 at the mainland, chick mortality was relatively constant between regions and years (70-80 %). Derived from chick mortality, breeding success was 0.51 (2005) and 1.0 (2006) chicks per pair on Wangerooge and constantly 0.15 chicks per pair at the mainland. Considering published estimates of annual subadult (35 %) and adult (25 %) mortality, breeding success achieved during this study should not be sufficient to maintain the regional population of the mainland study site. In contrast, the Wangerooge population produced more chicks than needed to sustain its local population. The assumption of spatially varying reproduction of Redshanks breeding in the Wadden Sea could be confirmed by this study. However, it still has to be clarified whether Redshank population dynamics is explained by this varying breeding success. Due to a lack of knowledge in annual survival rates, the necessity of initiating an integrated population monitoring project is discussed. As additionally revealed by chick telemetry, non-fledged chicks were found up to only about 200 m from its former nest site and used about 0.4 ha of the respective saltmarsh habitat. Small home range sizes of Redshank broods within the saltmarsh suggest a potential vulnerability to agricultural habitat management, especially to mowing. Derived from these results, it is unlikely that agriculture is an appropriate way of managing saltmarsh for breeding birds.

FAQ

Infos pratiques

Heures d'ouverture et contact

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...

Liens utiles

A-
A
A+