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European Journal of Wildlife Research : Volume 54, Issue 1, February 2008

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Three approaches to estimate wolf Canis lupus predation rates on moose Alces alces populations

Content Provider	Springer Nature Link
Author	Gundersen, Hege Solberg, Erling J. Wabakken, Petter Storaas, Torstein Zimmermann, Barbara Andreassen, Harry P.
Copyright Year	2007
Abstract	We employed three different methods to estimate predation rates on moose in a newly colonized wolf territory in Norway. In the first two methods, we estimated predation rates based on the difference in calf/cow ratios outside and inside the wolf pack territory from (1) hunter observations and (2) aerial surveys. In the last method, (3) we estimated loss of calves of radio-collared cows inside and outside the wolf pack territory. The difference in mortality rates estimated between the area subject to predation and the area outside the wolf pack territory essentially constitutes the additive component of predation. We also tested the sensitivity of violating the assumptions of methods 1 and 2 related to equal fecundity and mortality because of other factors than predation inside and outside the wolf pack territory. Predation rates varied considerably between years and methods used, with hunter observations (method 1) giving the lowest and aerial surveys (method 2) giving the highest estimates. Method 3 (radio telemetry) was the most direct assessment of predation and probably the best approach to estimate predation rates in moose. However, all three methods show the same yearly changes and may therefore be appropriate to question trends trough time or between areas.
Starting Page	335
Ending Page	346
Page Count	12
File Format	PDF
ISSN	16124642
Journal	European Journal of Wildlife Research
Volume Number	54
Issue Number	2
e-ISSN	14390574
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-11-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aerial survey Hunter observations Management Predator–prey interaction Radio telemetry Animal Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics Management, Monitoring, Policy and Law Nature and Landscape Conservation

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Moose (Alces alces) calf survival rates in the presence of wolves (Canis lupus) in southeast Norway

Data from: Moose movement rates are altered by wolf presence in two ecosystems (Dataset)

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Encounter frequencies between GPS-collared wolves (Canis lupus) and moose (Alces alces) in a Scandinavian wolf territory

Patterns of hunting mortality in Norwegian moose (Alces alces) populations

Summer kill rates and predation pattern in a wolf–moose system: can we rely on winter estimates?

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Three approaches to estimate wolf Canis lupus predation rates on moose Alces alces populations

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