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

Gundersen, Hege; Solberg, Erling J.; Wabakken, Petter; Storaas, Torstein; Zimmermann, Barbara; Andreassen, Harry Peter
Peer reviewed
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Three approaches to estimate wolf Canis lupus predation.pdf (486.8Kb)
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http://hdl.handle.net/11250/134148
Utgivelsesdato
2008
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  • Artikkel - fagfellevurdert vitenskapelig / Articles - peer-reviewed [1618]
Originalversjon
Gundersen, H., Solberg, E.J., Wabakken, P., Storaas, T., Zimmermann, B., Andreassen, H.P. (2008) Three approaches to estimate wolf Canis lupus predation rates on moose Alces alces populations. European Journal of Wildlife Research, 54(2), 335-346  
Sammendrag
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.
Utgiver
Springer Verlag
Tidsskrift
European Journal of Wildlife Research

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