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An evaluation of two potential risk factors, MHC diversity and host density, for infection by an invasive nematode Ashworthius sidemi in endangered European bison (Bison bonasus)

Jacek Radwan, Auteur ; Aleksander W. Demiaszkiewicz, Auteur ; Rafal Kowalczyk, Auteur ; Jacek Lachowicz, Auteur ; Agata Kawalko, Auteur ; Jan M. Wojcik, Auteur ; Anna M. Pyziel, Auteur ; Wieslaw Babik, Auteur

Dans Biological Conservation (143(9) SEP 2010)

Parasites are thought to increase the risk of host extinction, but their dynamics in endangered species have not been well investigated. The free-living European bison population in Bialowieza Forest has recently been massively invaded by a bloo[...]

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Article

Feeding habits of Great Grey Shrike Lanius excubitor wintering in north-eastern Poland: does prey abundance affect selection of prey size?

Marcin Brzezniski, Auteur ; Andrzej Zalewski, Auteur ; Pawel Szalanski, Auteur ; Rafal Kowalczyk, Auteur

Dans Ornis Fennica (87(1) 2010)

Diet composition and prey selection of wintering Great Grey Shrike (Lanius excubitor) were studied at two sites in north-eastern Poland: in the Mazurian Lakeland and at Bialowieza Glade. The feeding habits of shrikes were recorded on the basis o[...]

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