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dc.contributor.authorMattisson, Jenny
dc.contributor.authorRauset, Geir Rune
dc.contributor.authorOdden, John
dc.contributor.authorAndren, Henrik
dc.contributor.authorLinnell, John Durrus
dc.contributor.authorPersson, Jens
dc.date.accessioned2016-08-24T12:49:01Z
dc.date.accessioned2016-08-30T12:54:47Z
dc.date.available2016-08-24T12:49:01Z
dc.date.available2016-08-30T12:54:47Z
dc.date.issued2016
dc.identifier.citationEcosphere 2016, 7(8)nb_NO
dc.identifier.issn2150-8925
dc.identifier.urihttp://hdl.handle.net/11250/2402835
dc.description.abstractThe interaction between predators and their prey is a key factor driving population dynamics and shaping wildlife communities. Most predators will scavenge in addition to killing their own prey, which alters predation effects and implies that one cannot treat these as independent processes. However, the relative importance of predation vs. scavenging and the mechanisms driving variation of such are relatively unstudied in ecological research on predator–prey relationships. Foraging decisions in facultative predators are likely to respond to environmental conditions (e.g., seasonality) and inter-or intraspecific interactions (e.g., prey availability, presence of top predators, scavenging competition). Using data on 41 GPS-collared wolverines (Gulo gulo) during 2401 monitoring days, in four study sites in Scandinavia, we studied variation in diet and feeding strategies (predation vs. scavenging), along a gradient of environmental productivity, seasonality, density, and body mass of their main prey, semidomestic reindeer (Rangifer tarandus). The most important factor affecting the relative extent of predation and scavenging was mean prey body mass. Predation was more pronounced in summer, when vulnerable reindeer calves are abundant, and individual kill rates were negatively related to local reindeer body mass. This relationship was absent in winter. The probability of scavenging was higher in winter and increased with decreasing local reindeer body mass, likely as a response to increased carrion supply. Wolverine feeding strategy was further influenced by predictable anthropogenic food resources (e.g., slaughter remains from hunted ungulates) and the presence of a top predator, Eurasian lynx (Lynx lynx), which provided a continuous carrion supply promoting scavenging. Our results suggest that wolverine feeding strategies are flexible and strongly influenced by seasonally dependent responses to prey body condition in combination with carrion supply. This study demonstrates that large-scale environmental variation can result in contrasting predator feeding strategies, strongly affecting trophic interactions and potentially shaping the dynamics of ecological communities.nb_NO
dc.language.isoengnb_NO
dc.rightsNavngivelse 3.0 Norge*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/no/*
dc.subjectcompetitionnb_NO
dc.subjectfacilitationnb_NO
dc.subjectfood hoardingnb_NO
dc.subjectindividual-based studiesnb_NO
dc.subjectLynx lynxnb_NO
dc.subjectmustelidaenb_NO
dc.subjectpredator–preynb_NO
dc.subjectresource usenb_NO
dc.subjectseasonalitynb_NO
dc.titlePredation or scavenging? Prey body condition influencesdecision-making in a facultative predator, the wolverinenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.date.updated2016-08-24T12:49:01Z
dc.source.volume7nb_NO
dc.source.journalEcospherenb_NO
dc.source.issue8nb_NO
dc.identifier.doi10.1002/ecs2.1407
dc.identifier.cristin1374903
dc.relation.projectNorges forskningsråd 212919nb_NO


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