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Study reveals the most important considerations for grizzly bear conservation

2023-09-20
(Press-News.org) Humans negatively impact the health of grizzly bear populations through top-down influences like direct mortality associated with forestry roads (from conflict or illegal killings) and displacement from high quality habitats, and through bottom-up influences like reducing availability of food resources. Research published in Wildlife Monographs reveals the relationship between these forces, informing a strategic conservation program.

Investigators radio-collared and followed numerous grizzly bears over multiple years in southeastern British Columbia. They found an interesting interplay between the most important bottom-up factor, huckleberry patches, and mortality risk from forestry roads (road density and the amount of secure habitat away from roads). Top-down influences were not only associated with mortality risk, but they limited contributions of critical food resources, reducing female grizzly fitness and density, in essence having a similar effect as habitat loss. This doubly negative effect likely contributes to the ubiquitous detriment that high forestry road density confers to grizzly bear populations in western North America.

The findings highlight the importance of considering both bottom-up and top-down influences affecting wildlife populations. “The securing of important food resources to make them accessible to bears is accomplished through some degree of restriction of human access,” said lead author Michael Proctor, PhD, of Birchdale Ecological Ltd. “Our results suggest that benefits of critical bear foods are not satisfactorily realized unless human access to nearby roads is reduced.”

URL upon publication: https://onlinelibrary.wiley.com/doi/10.1002/wmon.1078

 

Additional Information
NOTE: The information contained in this release is protected by copyright. Please include journal attribution in all coverage. For more information or to obtain a PDF of any study, please contact: Sara Henning-Stout, newsroom@wiley.com.

About the Journal
Wildlife Monographs, one of three peer-reviewed journals of The Wildlife Society, publishes research regarding the management and conservation of wildlife, emphasizing comprehensive synthesis of a topic.

About Wiley
Wiley is a knowledge company and a global leader in research, publishing, and knowledge solutions. Dedicated to the creation and application of knowledge, Wiley serves the world’s researchers, learners, innovators, and leaders, helping them achieve their goals and solve the world's most important challenges. For more than two centuries, Wiley has been delivering on its timeless mission to unlock human potential. Visit us at Wiley.com. Follow us on Facebook, Twitter, LinkedIn and Instagram.

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[Press-News.org] Study reveals the most important considerations for grizzly bear conservation