Temporal variation in the population characteristics of harvested wolverine (Gulo gulo) in northwestern Canada
Piia M. Kukka A B D , Thomas S. Jung A B , Jean-François Robitaille C and Fiona K. A. Schmiegelow A
+ Author Affiliations
- Author Affiliations
A Department of Renewable Resources, University of Alberta, Edmonton, Alberta, T6G 2H1, Canada.
B Department of Environment, Government of Yukon, Whitehorse, Yukon, Y1A 2C6, Canada.
C Department of Biology, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada.
D Corresponding author. Email: pmkukka@gmail.com
Wildlife Research 44(7) 497-503 https://doi.org/10.1071/WR17063
Submitted: 23 May 2016 Accepted: 23 July 2017 Published: 31 October 2017
Abstract
Context: Wolverines (Gulo gulo) are harvested for fur in northern Canada; however, the impacts of harvest are poorly known. Additionally, wolverine population data are largely absent for much of their northern range. Demographic data collected from harvested wolverines provide information on the vulnerability and variability of different sex and age cohorts to harvest, which, in turn, may have implications for harvest sustainability.
Aims: We examined the temporal variability of different sex and age cohorts in wolverine harvest among years, and within the harvest season, in Yukon, Canada. We also examined the pregnancy status of female wolverines in relation to the harvest date, so as to evaluate the impact of the harvest-season length on breeding wolverines.
Methods: We determined the sex and age composition of harvested wolverines via dissections of 655 carcasses collected from 2005 to 2014. We determined the reproductive status and fetal measurements for female wolverines via dissections of reproductive tracts.
Key results: The harvest consisted mostly of males, particularly of young individuals. The sex ratio of harvested animals did not fluctuate significantly, but we observed variation in the age structure among years. The age structure varied within the harvest season (November to March), with a greater proportion of adults being harvested in late winter. Active gestation was evident in females harvested after mid-January, and near-term or postpartum females were harvested during late February and March.
Conclusions: Late winter harvest is likely to have a more significant impact on populations than is early winter harvest, because of increased harvest of adults and breeding females. Wolverine harvest season extends to the onset of the denning season in late February and March, indicating a concern for ethical harvest.
Implications: Limiting the legal harvest season to early winter may contribute to improved harvest sustainability and protection of breeding wolverines in northern latitudes.
Additional keywords: wildlife management, furbearer, harvest, mustelid.
References
Anderson, C. R., and Lindzey, F. G. (2005). Experimental evaluation of population trend and harvest composition in a Wyoming cougar population. Wildlife Society Bulletin 33, 179–188.| Experimental evaluation of population trend and harvest composition in a Wyoming cougar population.Crossref | GoogleScholarGoogle Scholar |
Banci, V. (1987). Ecology and behavior of wolverine in Yukon. M.Sc. Thesis, Simon Fraser University, Vancouver, Canada.
Banci, V., and Harestad, A. S. (1988). Reproduction and natality of wolverine (Gulo gulo) in Yukon. Annales Zoologici Fennici 25, 265–270.
Banci, V., and Proulx, G. (1999). Resiliency of furbearers to trapping in Canada. In ‘Mammal Trapping’. (Ed. G. Proulx.) pp. 175–203. (Alpha Wildlife Publications: Sherwood Park, Alberta, Canada.)
Blomqvist, L. (1995). Reproductive parameters of wolverines (Gulo g. gulo) in captivity. Annales Zoologici Fennici 32, 441–444.
Blomqvist, L. (2012). ‘Husbandry Manual for Captive Wolverines, Gulo gulo, 2012.’ (Nordens Ark Foundation: Hunnebostrand, Sweden.)
Buskirk, S. W., and Lindstedt, S. L. (1989). Sex biases in trapped samples of Mustelidae. Journal of Mammalogy 70, 88–97.
| Sex biases in trapped samples of Mustelidae.Crossref | GoogleScholarGoogle Scholar |
Chilelli, M. E., Griffith, B., and Harrison, D. J. (1996). Interstate comparisons of river otter harvest data. Wildlife Society Bulletin 24, 238–246.
COSEWIC (2014). COSEWIC annual report 2013–2014. Committee on the Status of Endangered Wildlife in Canada, Ottawa, Canada.
Dalerum, F., Shults, B., and Kunkel, K. (2008). Estimating sustainable harvest in wolverine populations using logistic regression. The Journal of Wildlife Management 72, 1125–1132.
| Estimating sustainable harvest in wolverine populations using logistic regression.Crossref | GoogleScholarGoogle Scholar |
Dawson, F. N., Magoun, A. J., Bowman, J., and Ray, J. C. (2010). Wolverine, Gulo gulo, home range size and denning habitat in lowland boreal forest in Ontario. Canadian Field Naturalist 124, 139–144.
| Wolverine, Gulo gulo, home range size and denning habitat in lowland boreal forest in Ontario.Crossref | GoogleScholarGoogle Scholar |
DeVink, J.-M., Berezanski, D., and Imrie, D. (2011). Comments on Brodie and Post: harvest effort: the missing covariate in analyses of furbearer harvest data. Population Ecology 53, 261–262.
| Comments on Brodie and Post: harvest effort: the missing covariate in analyses of furbearer harvest data.Crossref | GoogleScholarGoogle Scholar |
Douglas, C. W., and Strickland, M. A. (1987). Fisher. In ‘Wild Furbearer Management and Conservation in North America’. (Eds M. Novak, J. A. Baker, M. E. Obbard and B. Malloch.) pp. 511–529. Ministry of Natural Resources, Ontario, Canada.
Fortin, C., and Cantin, M. (2005). Harvest status, reproduction and mortality in a population of American martens in Québec, Canada. In ‘Martens and Fishers (Martes) in Human-altered Environments: an International Perspective’. (Ed. D. Harrison.) pp. 221–234. (Springer Science and Business Media Inc.: USA.)
Fryxell, J., Falls, J. B., Falls, E. A., Brooks, R. J., Dix, L., and Strickland, M. (2001). Harvest dynamics of mustelid carnivores in Ontario, Canada. Wildlife Biology 7, 151–159.
Golden, H. N., Christ, A. M., and Solomon, E. K. (2007). Spatiotemporal analysis of wolverine Gulo gulo harvest in Alaska. Wildlife Biology 13, 68–75.
| Spatiotemporal analysis of wolverine Gulo gulo harvest in Alaska.Crossref | GoogleScholarGoogle Scholar |
Hodgman, T. P., Harrison, D. J., Katnik, D. D., and Elowe, K. D. (1994). Survival in an intensively trapped marten population in Maine. The Journal of Wildlife Management 58, 593–600.
| Survival in an intensively trapped marten population in Maine.Crossref | GoogleScholarGoogle Scholar |
Hornocker, M. G., and Hash, H. S. (1981). Ecology of the wolverine in northwestern Montana. Canadian Journal of Zoology 59, 1286–1301.
| Ecology of the wolverine in northwestern Montana.Crossref | GoogleScholarGoogle Scholar |
Inman, R. M., Packila, M. L., Inman, K. H., McCue, A. J., White, G. C., Persson, J., Aber, B. C., Orme, M. L., Alt, K. L., Cain, S. L., Fredrick, J. A., Oakleaf, B. J., and Sartorius, S. S. (2012a). Spatial ecology of wolverines at the southern periphery of distribution. The Journal of Wildlife Management 76, 778–792.
| Spatial ecology of wolverines at the southern periphery of distribution.Crossref | GoogleScholarGoogle Scholar |
Inman, R. M., Magoun, A. J., Persson, J., and Mattisson, J. (2012b). The wolverine’s niche: linking reproductive chronology, caching, competition, and climate. Journal of Mammalogy 93, 634–644.
| The wolverine’s niche: linking reproductive chronology, caching, competition, and climate.Crossref | GoogleScholarGoogle Scholar |
King, C. M. (1975). The sex ratio of trapped weasels (Mustela nivalis). Mammal Review 5, 1–8.
| The sex ratio of trapped weasels (Mustela nivalis).Crossref | GoogleScholarGoogle Scholar |
Kokko, H. (2001). Optimal and suboptimal use of compensatory responses to harvesting: timing of hunting as an example. Wildlife Biology 7, 159–168.
Koskela, A., Kojola, I., Aspi, J., and Hyvarinen, M. (2013). Effect of reproductive status on the diet composition of wolverines (Gulo gulo) in boreal forests of eastern Finland. Annales Zoologici Fennici 50, 100–106.
| Effect of reproductive status on the diet composition of wolverines (Gulo gulo) in boreal forests of eastern Finland.Crossref | GoogleScholarGoogle Scholar |
Krebs, J., Lofroth, E., Copeland, J., Banci, V., Cooley, D., Golden, H., Magoun, A., Mulders, R., and Shults, B. (2004). Synthesis of survival rates and causes of mortality in North American wolverines. The Journal of Wildlife Management 68, 493–502.
| Synthesis of survival rates and causes of mortality in North American wolverines.Crossref | GoogleScholarGoogle Scholar |
Krebs, J., Lofroth, E. C., and Parfitt, I. (2007). Multiscale habitat use by wolverines in British Columbia, Canada. The Journal of Wildlife Management 71, 2180–2192.
| Multiscale habitat use by wolverines in British Columbia, Canada.Crossref | GoogleScholarGoogle Scholar |
Kukka, P. (2017). Spatiotemporal patterns and population characteristics of harvested wolverine (Gulo gulo) in Yukon. M.Sc. Thesis, University of Alberta, Edmonton, Canada.
Lee, J. (1995). Wolverine harvest and carcass collection: Coppermine, Bay Chimo and Bathurst Inlet 1993/94. Manuscript report no. 81. Government of Northwest Territories, Yellowknife, Canada.
Linnell, J. D. C., Broseth, H., Odden, J., and Nilsen, E. B. (2010). Sustainably harvesting a large carnivore? Development of Eurasian lynx populations in Norway during 160 years of shifting policy. Environmental Management 45, 1142–1154.
| Sustainably harvesting a large carnivore? Development of Eurasian lynx populations in Norway during 160 years of shifting policy.Crossref | GoogleScholarGoogle Scholar |
Lofroth, E. C., and Ott, P. K. (2007). Assessment of the sustainability of wolverine harvest in British Columbia, Canada. The Journal of Wildlife Management 71, 2193–2200.
| Assessment of the sustainability of wolverine harvest in British Columbia, Canada.Crossref | GoogleScholarGoogle Scholar |
Lofroth, E. C., Krebs, J. A., Harrower, W. L., and Lewis, D. (2007). Food habits of wolverine Gulo gulo in montane ecosystems of British Columbia, Canada. Wildlife Biology 13, 31–37.
| Food habits of wolverine Gulo gulo in montane ecosystems of British Columbia, Canada.Crossref | GoogleScholarGoogle Scholar |
Magoun, A. J. (1985). Population characteristics, ecology and management of wolverines in northwestern Alaska. Ph.D. Thesis, University of Alaska Fairbanks, Fairbanks, AK.
Magoun, A. J., and Copeland, J. P. (1998). Characteristics of wolverine reproductive den sites. The Journal of Wildlife Management 62, 1313–1320.
| Characteristics of wolverine reproductive den sites.Crossref | GoogleScholarGoogle Scholar |
May, R., Gorini, L., van Dijk, J., Broseth, H., Linnell, J. D. C., and Landa, A. (2012). Habitat characteristics associated with wolverine den sites in Norwegian multiple-use landscapes. Journal of Zoology 287, 195–204.
| Habitat characteristics associated with wolverine den sites in Norwegian multiple-use landscapes.Crossref | GoogleScholarGoogle Scholar |
McKelvey, K. S., Lofroth, E. C., Copeland, J. P., Aubry, K. B., and Magoun, A. J. (2010). Wolverines and declining snowpack: response to comments. Population Ecology 53, 267–269.
McLellan, B. N., Mowat, G., Hamilton, T., and Hatter, I. (2016). Sustainability of the grizzly bear hunt in British Columbia, Canada. The Journal of Wildlife Management 81, 218–229.
| Sustainability of the grizzly bear hunt in British Columbia, Canada.Crossref | GoogleScholarGoogle Scholar |
Parker, H., and Rosell, F. (2001). Parturition dates for Eurasian beaver Castor fiber: when should spring hunting cease? Wildlife Biology 7, 237–241.
Persson, J. (2005). Female wolverine (Gulo gulo) reproduction: reproductive costs and winter food availability. Canadian Journal of Zoology 83, 1453–1459.
| Female wolverine (Gulo gulo) reproduction: reproductive costs and winter food availability.Crossref | GoogleScholarGoogle Scholar |
Persson, J., Landa, A., Andersen, R., and Segerstrom, P. (2006). Reproductive characteristics of female wolverines (Gulo gulo) in Scandinavia. Journal of Mammalogy 87, 75–79.
| Reproductive characteristics of female wolverines (Gulo gulo) in Scandinavia.Crossref | GoogleScholarGoogle Scholar |
Persson, J., Wedholm, P., and Segerstrom, P. (2010). Space use and territoriality of wolverines (Gulo gulo) in northern Scandinavia. European Journal of Wildlife Research 56, 49–57.
| Space use and territoriality of wolverines (Gulo gulo) in northern Scandinavia.Crossref | GoogleScholarGoogle Scholar |
Poulin, R., Knight, J., Obbard, M., and Witherspoon, G. (2003). Nuisance bear review committee report and recommendations. Ministry of Natural Resources, Ontario, Canada.
Rauset, G. R., Low, M., and Persson, J. (2015). Reproductive patterns result from age-related sensitivity to resources and reproductive costs in a mammalian carnivore. Ecology 96, 3153–3164.
| Reproductive patterns result from age-related sensitivity to resources and reproductive costs in a mammalian carnivore.Crossref | GoogleScholarGoogle Scholar |
Rolley, R. E. (1985). Dynamics of a harvested bobcat population in Oklahoma. The Journal of Wildlife Management 49, 283–292.
| Dynamics of a harvested bobcat population in Oklahoma.Crossref | GoogleScholarGoogle Scholar |
Shilo, R. A., and Tamarovskaya, M. A. (1981). The growth and development of wolverines at Novosibirsk Zoo. International Zoo Yearbook 21, 146–147.
| The growth and development of wolverines at Novosibirsk Zoo.Crossref | GoogleScholarGoogle Scholar |
Smith, L. M., Brisbin, I. L., and White, G. C. (1984). An evaluation of total trapline captures as estimates of furbearer abundance. The Journal of Wildlife Management 48, 1452–1455.
| An evaluation of total trapline captures as estimates of furbearer abundance.Crossref | GoogleScholarGoogle Scholar |
Smith, C. A. S., Meikle, J. C., and Roots, C. F. (Ed.) (2004). ‘Ecoregions of the Yukon Territory: Biophysical Properties of Yukon Landscapes.’ (Agriculture and Agric.-Food Canada: Summerland, British Columbia, Canada.)
Strickland, M. A., and Douglas, C. W. (1987). Marten. In ‘Wild Furbearer Management and Conservation in North America’. (Eds M. Novak, J. A. Baker, M. E. Obbard and B. Malloch.) pp. 530–546. Ministry of Natural Resources, Ontario, Canada.
Taylor, M. K., DeMaster, D.P., Bunnell, F.L., and Schweinsburg, R.E. (1987). Modeling the sustainable harvest of female polar bears. The Journal of Wildlife Management 51, 811–820.
| Modeling the sustainable harvest of female polar bears.Crossref | GoogleScholarGoogle Scholar |
Taylor, M. K., McLoughlin, P. D., and Messier, F. (2008). Sex-selective harvesting of polar bears Ursus maritimus. Wildlife Biology 14, 52–60.
| Sex-selective harvesting of polar bears Ursus maritimus.Crossref | GoogleScholarGoogle Scholar |
van Dijk, J., Gustavsen, L., Mysterud, A., May, R., Flagstad, O., Broseth, H., Andersen, R., Andersen, R., Steen, H., and Landa, A. (2008a). Diet shift of a facultative scavenger, the wolverine, following recolonization of wolves. Journal of Animal Ecology 77, 1183–1190.
| Diet shift of a facultative scavenger, the wolverine, following recolonization of wolves.Crossref | GoogleScholarGoogle Scholar |
van Dijk, J., Andersen, T., May, R., Andersen, R., Andersen, R., and Landa, A. (2008b). Foraging strategies of wolverines within a predator guild. Canadian Journal of Zoology 86, 966–975.
| Foraging strategies of wolverines within a predator guild.Crossref | GoogleScholarGoogle Scholar |
Vangen, K. M., Persson, J., Landa, A., Andersen, R., and Segerstrom, P. (2001). Characteristics of dispersal in wolverines. Canadian Journal of Zoology 79, 1641–1649.
| Characteristics of dispersal in wolverines.Crossref | GoogleScholarGoogle Scholar |
Weaver, J. L., Paquet, P. C., and Ruggiero, L. F. (1996). Resilience and conservation of large carnivores in the Rocky Mountains. Conservation Biology 10, 964–976.
| Resilience and conservation of large carnivores in the Rocky Mountains.Crossref | GoogleScholarGoogle Scholar |
Webb, S., Manzer, D., Anderson, R., and Jokinen, M. (2013). Wolverine harvest summary from registered traplines in Alberta, 1985–2011. Technical report T-2013-001. Alberta Conservation Association, Sherwood Park, Alberta, Canada.
Whitman, J. S. (2003). Age structure differences in American mink, Mustela vison, populations under varying harvest regimes. Canadian Field Naturalist 117, 35–38.
Wright, P., and Rausch, R. (1955). Reproduction in the wolverine, Gulo gulo. Journal of Mammalogy 36, 346–355.
| Reproduction in the wolverine, Gulo gulo.Crossref | GoogleScholarGoogle Scholar |
Yukon Bureau of Statistics (2014). Population report June 2014. Information sheet no. 58.49. Government of Yukon, Whitehorse, Canada.
