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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Feeding ecology of the Montagu's Harrier Circus pygargus in the intensively used agricultural landscape of the Hellwegborde, North Rhine-Westphalia
Auteurs :	Manfred Hoelker, Auteur ; Thomas Wagner, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (127(1) 2006)
Article en page(s) :	37-50
Résumé :	A long-term analysis of pellets and remains of prey of the Montagu's Harrier enabled the determination of diet, relative quantities of the different prey species, and variations in prey availability in the period 1993-2002. Out of 748 pellets and 133 prey remains, 1,525 prey items could be identified, including 61.5% vertebrates, 38% invertebrates and 0.5% bird eggs. The total prey biomass consisted of 99% vertebrates, the Common Vole Microtus arvalis being the Most important species. Birds, especially Skylark Alauda arvensis, provided 15.3% Of prey biomass. In the agricultural study area. voles (41.4% of prey items, 66.3% of prey biomass on average) are the main factor governing population fluctuations of the Montagu's Harrier. In vole gradation years (> 75% of prey biomass), clutch size and number of successful broods were above average. This correlates to findings from other regions of Europe, where different rodent species play a dominant role in the diet of this raptor. In four years poor in voles (1994, 1997, 1999 and 2002), birds were the main prey providing 51.8-72.1 % of the biomass. Most prey animals had an estimated weight of 30-40 g. The share of insects in the prey biomass was negligible.

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