|
|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine >
Peer-reviewed Journal Articles, etc >
Dining from the coast to the summit : Salmon and pine nuts determine the summer body condition of female brown bears on the Shiretoko Peninsula
This item is licensed under:Creative Commons Attribution 4.0 International
| Title: | Dining from the coast to the summit : Salmon and pine nuts determine the summer body condition of female brown bears on the Shiretoko Peninsula |
| Authors: | Shirane, Yuri Browse this author | | Jimbo, Mina Browse this author | | Yamanaka, Masami Browse this author | | Nakanishi, Masanao Browse this author | | Mori, Fumihiko Browse this author | | Ishinazaka, Tsuyoshi Browse this author | | Sashika, Mariko Browse this author →KAKEN DB | | Tsubota, Toshio Browse this author →KAKEN DB | | Shimozuru, Michito Browse this author →KAKEN DB |
| Keywords: | body condition | | brown bear | | diet | | nutritional status | | reproductive status | | Ursus arctos |
| Issue Date: | 18-Mar-2021 |
| Publisher: | John Wiley & Sons |
| Journal Title: | Ecology and evolution |
| Volume: | 11 |
| Issue: | 10 |
| Start Page: | 5204 |
| End Page: | 5219 |
| Publisher DOI: | 10.1002/ece3.7410 |
| Abstract: | Body condition in mammals fluctuates depending on energy intake and expenditure. For brown bears (Ursus arctos), high-protein foods facilitate efficient mass gain, while lipids and carbohydrates play important roles in adjusting dietary protein content to optimal levels to maximize energy intake. On the Shiretoko Peninsula, Hokkaido, Japan, brown bears have seasonal access to high-lipid pine nuts and high-protein salmon. To assess seasonal and annual fluctuation in the body condition of adult female brown bears in relation to diet and reproductive status, we conducted a longitudinal study in a special wildlife protection area on the Shiretoko Peninsula during 2012-2018. First, analyses of 2,079 bear scats revealed that pine nuts accounted for 39.8% of energy intake in August and salmon accounted for 46.1% in September and that their consumption by bears varied annually. Second, we calculated the ratio of torso height to torso length as an index of body condition from 1,226 photographs of 12 adult females. Results indicated that body condition continued to decline until late August and started to increase in September when salmon consumption increased. In addition, body condition began to recover earlier in years when consumption of both pine nuts and salmon was high. Furthermore, females with offspring had poorer body condition than solitary females, in particular in late August in years with low salmon consumption. Our findings suggest that coastal and subalpine foods, which are unique to the Shiretoko Peninsula, determine the summer body condition of female brown bears, as well as their survival and reproductive success. |
| Rights: | http://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/81212 |
| Appears in Collections: | 獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
|
