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While that is true for inland brown/grizzly bears, the coastal brown bears under discussion in this article eat huge quantities of spawning salmon during the su
by Turing_Machine 5y ago
While that is true for inland brown/grizzly bears, the coastal brown bears under discussion in this article eat huge quantities of spawning salmon during the summer and early fall.
They get much larger and much fatter than the inland bears as a result.
- celrod 5y agoMore than 20% for many inland grizzly bears, e.g. Yellowstone: Approximately 45 ± 22% (equation image ± SD) of the assimilated nitrogen consumed by male grizzly bears, 38 ± 20% by female grizzly bears, and 23 ± 7% by male and female black bears came from animal matter. https://wildlife.onlinelibrary.wiley.com/doi/abs/10.1002/jwmg.483?casa_token=JGU9JINWtTEAAAAA%3AB5Bo0tlJAgNTc-8aWnTdizFMHbsQAoc7rCyTzJFalCs2m5rdtKIBjKnkIT7cCXDd1pEljrCTHc3imQ https://wildlife.onlinelibrary.wiley.com/doi/abs/10.1002/jwm... Diet varies a lot by region. Figure 7 here: <https://www.researchgate.net/profile/Bruce-Mclellan/publication/237973810_Implications_of_a_high-energy_and_low-protein_diet_on_the_body_composition_fitness_and_competitive_abilities_of_black_Ursus_americanus_and_grizzly_Ursus_arctos_bears/links/56d0865908ae85c82348721d/Implications-of-a-high-energy-and-low-protein-diet-on-the-body-composition-fitness-and-competitive-abilities-of-black-Ursus-americanus-and-grizzly-Ursus-arctos-bears.pdf https://www.researchgate.net/profile/Bruce-Mclellan/publicat...> Shows that for female grizzlies without salmon in their diets, % meat seems to vary from around 0% to 60% based on population.
- pfdietz 5y agoAssimilated nitrogen != calories. Fish are rich in protein; plants have a large share of digestible carbohydrates.