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The return of the wolf

effects on prey, competitors and scavengers

Wikenros, Camilla (2011). The return of the wolf. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2011:85
ISBN 978-91-576-7629-0
[Doctoral thesis]

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Abstract

Apex predators may have both direct and indirect effects on other species through predation and competition. I investigated the effects of wolves (Canis lupus) on prey species, competitors (including humans) and the scavenging guild after the re-colonization by wolves of the Scandinavian Peninsula. Field methods included telemetry, snow-tracking, age determination, and camera monitoring.

Human extermination of wolves at the end of the 19th century in combination with the extent and mode of hunter harvest has caused moose (Alces alces) to become predator-naïve. This has resulted in high hunting success rates and short chase distances by wolves hunting moose, compared to areas in North America where moose have been continuously exposed to wolf predation. The high kill rate by wolves on moose, in combination with mainly additive wolf predation resulted in exploitation competition between wolves and hunters, leading to reduced hunter harvest of moose within wolf territories. In contrast, neither exploitation competition nor interference competition were evident between wolves and Eurasian lynx (Lynx lynx), which was most likely a result of wolves and lynx having different main prey species, a high density of the shared prey species and low densities of both predator species.

The largest food source for scavenging species regarding the annual amount of available biomass was remains after hunter harvest of moose in autumn. Presence of wolves slightly reduced available biomass to scavenging species, but more important, wolves reduced the high seasonal variation of available biomass by providing carcasses all year round. The red fox (Vulpes vulpes), common raven (Corvus corax), European pine marten (Martes martes), and northern goshawk (Accipiter gentilis) may benefit from the return of wolves, due to their high utilization of wolf-killed moose in spring when the presence of wolves increased the availability of carcasses.

In summary, apex predators will have relatively little influence on other species in areas where human activities have a large impact on animal densities, such as in the wolf and moose system on the Scandinavian Peninsula.

Authors/Creators:Wikenros, Camilla
Title:The return of the wolf
Subtitle:effects on prey, competitors and scavengers
Series/Journal:Acta Universitatis agriculturae Sueciae
Year of publishing :2011
Volume:2011:85
Number of Pages:50
Papers/manuscripts:
NumberReferences
I.Sand, H., Wikenros, C., Wabakken, P. & Liberg, O. (2006). Crosscontinental differences in patterns of predation: will naïve moose in Scandinavia ever learn? Proceedings of the Royal Society B: Biological Sciences 273, 1421-1427.
II.Wikenros, C., Sand, H., Wabakken, P., Liberg, O. & Pedersen, H.C. (2009). Wolf predation on moose and roe deer: chase distances and outcome of encounters. Acta Theriologica 54, 207-218.
III.Wikenros, C., Sand, H., Bergström, R. & Liberg, O. Effects of wolf predation on hunter harvest of moose in Sweden – an empirical approach. (Manuscript).
IV.Wikenros, C., Liberg, O., Sand, H. & Andrén, H. (2010). Competition between recolonizing wolves and resident lynx in Sweden. Canadian Journal of Zoology 88, 271-279.
V.Wikenros, C., Sand, H., Ahlqvist, P. & Liberg, O. Alteration of biomass flow to scavengers after re-colonization by wolves of the Scandinavian Peninsula. (Manuscript).
Place of Publication:Uppsala
Publisher:Institutionen för ekologi, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-7629-0
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L20 Animal ecology
Subjects:Obsolete subject words > NATURAL SCIENCES > Biology > Terrestrial, freshwater and marine ecology > Terrestrial ecology
Agrovoc terms:wolves, lynxes, elks, roe deer, predation, animal competition, predator prey relations, animal ecology, population dynamics, habitats, behaviour, scandinavia
Keywords:apex predator, re-colonization, behaviour change, competition, scavenging, wolf, moose, lynx, hunter harvest, Scandinavian Peninsula
URN:NBN:urn:nbn:se:slu:epsilon-e-231
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-231
ID Code:8372
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: Camilla Wikenros
Deposited On:18 Oct 2011 05:31
Metadata Last Modified:02 Dec 2014 10:47

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