Brown bear predation on domestic sheep in central Norway

Autor:	Ole Jakob Sørensen, Kristian Overskaug, Tor Kvam, Truls Eggen, Arnstein Eidsmo, Vebjørn Knarrum, Ole Opseth
Rok vydání:	2006
Předmět:	Animal science biology Herd Animal Science and Zoology Flock Management Monitoring Policy and Law Ursus biology.organism_classification Parental investment Paternal care Nature and Landscape Conservation Predation Optimal foraging theory
Zdroj:	Ursus. 17:67-74
ISSN:	1938-5439 1537-6176
Popis:	In 1994, we studied predation on domestic sheep using mortality radiocollars in an area in central Norway inhabited by brown bears (Ursus arctos). The total loss among 234 radiocollared ewes in 3 herds released on summer pastures was 54, and 51 (94.4%) were due to bear predation. Among 337 radiocollared lambs, 37 were known to have died, 14 (42.4%) due to bear predation. Bears selected ewes over lambs, consistent with optimal foraging theory. Ewes with bells had a higher risk of being killed than ewes without bells. Selection of young ewes with male-dominated litters in spring and small lambs can partly be explained according to parental investment theory and selection for individuals that are last in the flock when attacked or chased by bears.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::db7c520d19c47e1c20ad37f988e4ddac https://doi.org/10.2192/1537-6176(2006)17[67:bbpods]2.0.co Zobrazit plný text záznamu