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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Prey spectrum of Marsh Harrier Circus aeruginosus (L., 1758) in Mecklenburg-Strelitz, eastern Germany.]
Auteurs :	Markus Lange, Auteur ; Thomas Hofmann, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (123(2) 2002)
Article en page(s) :	65-78
Résumé :	Between 1995 and 1997 prey remains and pellets were collected from 61 Marsh Harrier nests in Mecklenburg Strelitz (North-east Germany) in order to study the diet composition. Seventy-six species of vertebrates (53 birds species, 14 mammals species) and 38 insect species were identified. Species numbers and proportions of prey types differed significantly between prey remains at the nest and pellets. Birds made up 63% of all prey remains but constituted only 23% in pellets where mammals proved to be dominant with a content of 75% (prey remains 23%). Skylark (9.5%), Starling (7.9%), Coot (7.7%), Water Vole (6.4%), Mole (5.7%), Common Vole (5.5%), Yellowhammer (4.2%) and unspecified cyprinids (8.6%) were the most abundant prey remains. In contrast, small mammals such as Microtus spec. (32.7%) Water vole (10%), Moles 5.4% and Apodemus spec. (3%) provided the most frequent components in pellets. This obvious discrepancy may be due to differences in the detectability of certain species as prey remains or in pellets. Differences in prey composition existed also between study years. The proportion of birds increased from 49% to 72% during a depression of the Common Vole population in 1996. An analysis of prey species' habitat preferences revealed a larger number of species which prefer crops, but species of wetlands and especially of the open country reached higher quantities. The determination of insect remains turned out to be a special problem and their origin in pellets could not always be accurately solved. Coleoptera, especially carabids, dominated with 87%. The majority of species is bound to fields and grasslands.

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