Phenological tracking associated with increased salmon consumption by brown bears

Scientific Reports
William DeacyJonathan B Armstrong

Abstract

There is growing interest in the ecological significance of phenological diversity, particularly in how spatially variable resource phenologies (i.e. resource waves) prolong foraging opportunities for mobile consumers. While there is accumulating evidence of consumers moving across landscapes to surf resource waves, there is little data quantifying how phenological tracking influences resource consumption due to the challenge of documenting all the components of this ecological phenomenon (i.e., phenological variation, consumer movement, resource consumption, and consumer fitness). We examined the space use of GPS collared female brown bears to quantify the exploitation of a salmon resource wave by individual bears. We then estimated salmon consumption levels in the same individuals using stable isotope and mercury analyses of hair. We found strong positive relationships between time spent on salmon streams and percent salmon in assimilated diets (R2 = 0.70) and salmon mass consumed (R2 = 0.49). Salmon abundance varied 2.5-fold between study years, yet accounting for salmon abundance did not improve salmon consumption models. Resource abundance generally is viewed as the key variable controlling consumption levels and food web ...Continue Reading

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Aug 23, 2017·Proceedings of the National Academy of Sciences of the United States of America·William W DeacyJack A Stanford

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Citations

Feb 26, 2019·Proceedings of the National Academy of Sciences of the United States of America·Briana AbrahmsBruce R Mate
Nov 25, 2020·Trends in Ecology & Evolution·Briana AbrahmsJerod A Merkle
Apr 20, 2021·Integrative and Comparative Biology·Elizabeth K Perkin, Matthew J Wilson
Jul 22, 2021·Biological Reviews of the Cambridge Philosophical Society·E M Wolkovich, Megan J Donahue

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