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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
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Foraging ecology of mature male Antarctic minke whales (Balaenoptera bonaerensis) revealed by stable isotope analysis of baleen plates
| Title: | Foraging ecology of mature male Antarctic minke whales (Balaenoptera bonaerensis) revealed by stable isotope analysis of baleen plates |
| Authors: | Ishikawa, Hiroshi Browse this author | | Otsuki, Mayuko Browse this author | | Tamura, Tsutomu Browse this author | | Konishi, Kenji Browse this author | | Bando, Takaharu Browse this author | | Ishizuka, Mayumi Browse this author →KAKEN DB | | Ikenaka, Yoshinori Browse this author →KAKEN DB | | Nakayama, Shouta M. M. Browse this author →KAKEN DB | | Mitani, Yoko Browse this author |
| Keywords: | Antarctic ecosystem | | Feeding habits | | Euphausia superba | | Migration |
| Issue Date: | Mar-2022 |
| Publisher: | Elsevier |
| Journal Title: | Polar Science |
| Volume: | 31 |
| Start Page: | 100785 |
| Publisher DOI: | 10.1016/j.polar.2021.100785 |
| Abstract: | The Antarctic minke whale (Balaenoptera bonaerensis) is a seasonal migrator that feeds mainly on Antarctic krill at higher latitudes during the summer and travels to lower latitudes to breed in winter. A previous study using delta C-13 and delta N-15 values of baleen plates showed that pregnant Antarctic minke whales feed on Antarctic krill in the foraging season, with less feeding during the breeding season. However, long-term changes in the habitat use and diet of males remain unknown. In this study, we estimated the foraging habits of nine mature male Antarctic minke whales using the stable isotope signatures of baleen plates. From Bayesian stable isotope mixing models, it was found that Antarctic krill was the predominant prey of male whales, and prey species in lower latitudes were rarely incorporated into the baleen plates. This result is consistent with that of female Antarctic minke whales. Eight whales showed at least one oscillation in delta C-13 and delta N-15 values, whereas one whale (AM246) showed no variation in delta N-15 values. This possibly indicates that AM246 remained in the Antarctic water year-round. Our results suggest multiple migration patterns of male Antarctic minke whales. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86772 |
| Appears in Collections: | 水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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