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Population ecology of Scandinavian wolverines

Persson, Jens (2003). Population ecology of Scandinavian wolverines. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 262
ISBN 91-576-6346-7
[Doctoral thesis]

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Abstract

In this thesis I examine reproductive patterns, test for effects of reproductive costs and winter food availability on female reproduction, estimate rates and causes of juvenile mortality, examine dispersal patterns and analyze population viability. Wolverine (Gulo gulo) females reached the reproductive stage no earlier than 3 years of age and the minimum average age at first reproduction was 3.4 years. Each year about every second female reproduced and produced an average of 0.8 kits per female. Reproduction incurred costs on females that affected reproduction the subsequent year. Experimental food-supplementation of females in early winter enhanced reproductive rates, even though all food-supplemented females had reproduced the preceding year. I therefore suggest that reproductive success of wolverine females is determined by the combined effect of reproductive costs and winter food availability. The survival rate of radio-marked juveniles from May to February was about 70%. Intraspecific predation was the most important cause of juvenile mortality (50%), and occurred in May-June when juveniles are dependent on their mother and in August-September after independence. Mean dispersal age was 13 (7-26) months for both sexes. All males (n = 11) and 69% of the females (n = 9) dispersed. Competition for resources apparently determined female dispersal pattern, while competition for mates seemed to explain male dispersal pattern. Population dynamics of wolverines are largely influenced by stochastic components. A population viability analysis suggest that the carrying capacity of a Scandinavian population should exceed 46 adult (≥3 years old) females to not be considered vulnerable according to IUCN (2000). This should be seen as a preliminary guideline as parameter estimates in the model are uncertain. The Swedish population averaged 100 adult females during 1999-2001, which is far above the carrying capacity recommended for a population to not be considered “vulnerable”. The recruitment rate to the next generation is primarily influenced by adult female survival, effects of reproductive costs and winter food availability on female reproduction, and intraspecific predation on juveniles. The recruitment shows a large variation among individuals and years, suggesting that wolverine population dynamics is strongly characterized by stochastic components. Wildlife managers should especially consider the importance of adult female survival.

Authors/Creators:Persson, Jens
Title:Population ecology of Scandinavian wolverines
Year of publishing :April 2003
Volume:262
Number of Pages:40
Papers/manuscripts:
NumberReferences
ALLI. Persson, J., Landa, A., Andersen, R. and Segerström, P. Reproduction in Scandinavian wolverines. (Manuscript). II. Persson, J. Effects of reproductive costs and winter food availability on wolverine female reproduction. (Manuscript). III. Persson, J., Willebrand, T., Landa, A., Andersen, R. and Segerström, P. The role of intraspecific predation in the survival of juvenile wolverines. Wildlife Biology (In Press). IV. Vangen, K.M., Persson, J., Landa, A., Andersen, R. and Segerström, P. 2001. Characteristics of wolverine dispersal. Canadian Journal of Zoology 79: 1641-1649. V. Sæther, B.-E., Engen, S., Persson, J., Brøseth, H., Landa, A. and Willebrand, T. Management strategies for the Scandinavian wolverine: practical application of stochastic models in Population Viability Analysis. (Manuscript submitted to Ecological Applications).
Place of Publication:Umeå
ISBN for printed version:91-576-6346-7
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L20 Animal ecology
Subjects:Not in use, please see Agris categories
Agrovoc terms:mustelidae, reproduction, food supply, predation, juveniles, survival, population dynamics, viability, population ecology, models, wildlife, management
Keywords:demography, dispersal, Gulo gulo, infanticide, intraspecific predation, juvenile survival, Norway, population viability, PVA, reproduction, reproductive costs, Sweden, wolverine
ID Code:205
Department:(S) > Institutionen för skoglig zooekologi
Deposited By: Jens Persson
Deposited On:01 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:02

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