Recruitment in a social carnivore before and after harvest
Corresponding Author
D. E. Ausband
Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT, USA
Correspondence
David E. Ausband, Montana Cooperative Wildlife Research Unit, Natural Sciences Room 205, University of Montana, Missoula, MT 59812, USA. Tel: 406 243 4329; Fax: 406 243 6064; Email: [email protected]
Search for more papers by this authorC. R. Stansbury
Department of Fish and Wildlife Sciences, University of Idaho, Moscow, ID, USA
Search for more papers by this authorJ. L. Stenglein
Wisconsin Department of Natural Resources, Madison, WI, USA
Search for more papers by this authorJ. L. Struthers
Idaho Department of Fish and Game, Nampa, ID, USA
Search for more papers by this authorL. P. Waits
Department of Fish and Wildlife Sciences, University of Idaho, Moscow, ID, USA
Search for more papers by this authorCorresponding Author
D. E. Ausband
Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT, USA
Correspondence
David E. Ausband, Montana Cooperative Wildlife Research Unit, Natural Sciences Room 205, University of Montana, Missoula, MT 59812, USA. Tel: 406 243 4329; Fax: 406 243 6064; Email: [email protected]
Search for more papers by this authorC. R. Stansbury
Department of Fish and Wildlife Sciences, University of Idaho, Moscow, ID, USA
Search for more papers by this authorJ. L. Stenglein
Wisconsin Department of Natural Resources, Madison, WI, USA
Search for more papers by this authorJ. L. Struthers
Idaho Department of Fish and Game, Nampa, ID, USA
Search for more papers by this authorL. P. Waits
Department of Fish and Wildlife Sciences, University of Idaho, Moscow, ID, USA
Search for more papers by this authorAbstract
Knowledge about recruitment in a population can be critical when making conservation decisions, particularly for harvested species. Harvest can affect population demography in complex ways and this may be particularly true for cooperatively breeding species whose successful reproduction is often linked with complex social dynamics. We currently have a poor understanding of how harvest affects recruitment in cooperatively breeding species. We used non-invasive genetic sampling and a natural experiment to estimate recruitment in a population of gray wolves Canis lupus before and after harvest in the northern Rocky Mountains, US (2008–2013). We hypothesized that recruitment would decline after hunting and trapping began and that the decline in recruitment would be attributable to the harvest of pups and not to the subtler mechanisms associated with group dynamics and reduced reproductive success. We collected fecal samples from wolves in 10 packs for 6 consecutive years, extracted DNA and genotyped 154 individual pups across 18 microsatellite loci. Population harvest rates averaged 23.8% (sd = 9.2). Our hypothesis that recruitment would decline was supported; survival from 3 to 15 months of age decreased from 0.60 [95% confidence interval (CI): 0.48–0.72] without harvest to 0.38 (95% CI: 0.28–0.48) with harvest and recruitment declined from 3.2 (95% CI: 2.1–4.3) to 1.6 (95% CI: 1.1–2.1) pups per pack after harvest was initiated. We cannot unequivocally dismiss other factors that could have reduced recruitment, however, an increase in recruitment when harvest temporarily ceased lends support to our conclusion that harvest reduced recruitment. We attributed just 18–38% of pup mortality directly to harvest and suggest that there are indirect effects of harvest on recruitment that may be associated with changes in group size and structure. Models that do not include both direct and indirect effects of harvest on recruitment may underestimate the potential impact of harvest on population growth in social species.
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