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Polar Biology

, Volume 41, Issue 4, pp 773–780 | Cite as

Plasticity in physiological condition of female brown bears across diverse ecosystems

  • Grant V. Hilderbrand
  • David D. Gustine
  • Buck Mangipane
  • Kyle Joly
  • William Leacock
  • Lindsey Mangipane
  • Joy Erlenbach
  • Mathew S. Sorum
  • Matthew D. Cameron
  • Jerrold L. Belant
  • Troy Cambier
Original Paper
  • 172 Downloads

Abstract

Variation in life history strategies facilitates the near global distribution of mammals by expanding realized niche width. We investigated physiological plasticity in the spring body composition of adult female brown bears (Ursus arctos) across 4 diverse Alaskan ecosystems. Brown bears are a highly intelligent omnivore with a historic range spanning much of North America, Europe, and Asia. We hypothesized that body mass, fat mass, lean mass, and total caloric content would increase across populations with increasing food resource availability. Throughout their range, brown bears enter a period of torpor during winter months, decreasing their metabolic rate as an adaptation to this period of reduced food availability. They also give birth to and nourish offspring during this time. Due to this specific life history strategy, we further hypothesized that proportional body fat and the proportion of total calories derived from fat would be consistent across populations. Our results supported our first hypothesis: body, fat, and lean masses, and caloric content of bears across populations increased with the quality and abundance of available food. However, the proportional body fat content and proportion of calories from fat differed across populations indicating population-specific strategies to meet the demands of reduced seasonal food availability, offspring production and rearing, and climate as well as some plasticity to respond to environmental change or ecosystem perturbations. Investigations of body condition and energetics benefit from combined assessments of absolute, proportional, and caloric metrics to understand the nuances of brown bear physiological dynamics across and within populations.

Keywords

Body composition Brown bear Energy Plasticity Ursus arctos 

Notes

Acknowledgements

We thank biologists W. Deacy and A. Morehouse, wildlife veterinarian J. Powers, and pilots A. Greenblatt, M. Keller, J. DeCreeft, R. Richotte, C. Cebulski, D. Welty, I. Bedingfield, K. Rees, K. VanHatten, and J. and J. Cummings for their assistance with animal capture and handling. N. Svoboda and three anonymous reviewers provided insightful comments and improved the manuscript. Funding was provided by the National Park Service, U.S. Fish and Wildlife Service, and U.S. Geological Survey. All procedures performed in studies involving animals were in accordance with the ethical standards of the institutions or practice at which the studies were conducted. Use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U. S. Government.

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Copyright information

© Springer 2018

Authors and Affiliations

  1. 1.U.S. Geological Survey, Alaska Science CenterAnchorageUSA
  2. 2.National Park Service, Grand Teton National ParkMooseUSA
  3. 3.National Park Service, Lake Clark National Park and PreservePort AlsworthUSA
  4. 4.National Park Service, Gates of the Arctic National Park and PreserveFairbanksUSA
  5. 5.U.S. Fish and Wildlife Service, Kodiak National Wildlife RefugeKodiakUSA
  6. 6.Carnivore Ecology Laboratory, Forest and Wildlife Research CenterMississippi State UniversityStarkvilleUSA
  7. 7.School of the EnvironmentWashington State UniversityPullmanUSA
  8. 8.Chena River AviationFairbanksUSA

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