Hunted wolves are under stress

Heavily hunted wolves have higher stress and reproductive steroids than wolves with lower hunting pressure

Bryan, Heather M., Judit E. G. Smits, Lee Koren, Paul C. Paquet, Katherine E. Wynne-Edwards  and Marco Musiani. 2014. Heavily hunted wolves have higher stress and reproductive steroids than wolves with lower hunting pressure. Functional Ecology. DOI: 10.1111/1365-2435.12354

Download  Bryan et al. 2014  Hunting caused stress in wolves PDF

Popular summary

Want  a quick summary of what this paper found and why it’s important?

Stress in hunted wolves- popular summary RCF 2014 PDF

Science Abstract

Human-caused harassment and mortality (e.g. hunting) affects many aspects of wildlife population dynamics and social structure. Little is known, however, about the social and physio-logical effects of hunting, which might provide valuable insights into the mechanisms by which wildlife respond to human-caused mortality.

To investigate physiological consequences of hunting, we measured stress and reproductive hormones in hair, which reflect endocrine activity during hair growth. Applying this novel approach, we compared steroid hormone levels in hair of wolves (Canis lupus) living in Canada’s tundra–taiga (n= 103) that experience heavy rates of hunting with those in the northern boreal forest (n= 45) where hunting pressure is substantially lower.

The hair samples revealed that progesterone was higher in tundra–taiga wolves, possibly reflecting increased reproductive effort and social disruption in response to human-related mortality. Tundra–taiga wolves also had higher testosterone and cortisol levels, which may reflect social instability.

To control for habitat differences, we also measured cortisol in an out-group of boreal for-est wolves (n= 30) that were killed as part of a control programme. Cortisol was higher in the boreal out-group than in our study population from the northern boreal forest.

Overall, our findings support the social and physiological consequences of human-caused mortality. Long-term implications of altered physiological responses should be considered in management and conservations strategies.

Help us protect KELÁ_EKE Kingfisher Forest

Together with Pender Islands Conservancy, we are raising funds to purchase and permanently protect a 45 acre forested property on the edge of the Salish Sea. The KELÁ_EKE Kingfisher Forest is located within the Coastal Douglas-fir (CDF) biogeoclimatic zone, one of the most biodiverse ecosystems in Canada. It is also among the most threatened in Canada. Protecting these forests is an investment in our collective future.

We’ve just announced a donation matching campaign to support the purchase and permanent protection of KELÁ_EKE Kingfisher Forest. Every dollar donated before December 31, 2022 will be matched by anonymous donors. This is a chance for you to double your impact!