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Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates
| Title: | Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
| Authors: | Uchida, Mayuka Browse this author | | Suzuki, Ippei Browse this author | | Ito, Keizo 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 | | Tamura, Tsutomu Browse this author | | Konishi, Kenji Browse this author | | Bando, Takeharu Browse this author | | Mitani, Yoko Browse this author →KAKEN DB |
| Keywords: | Feeding record | | Stable isotope analysis | | Baleen plate | | Antarctic minke whales | | Antarctic |
| Issue Date: | Mar-2021 |
| Publisher: | Springer |
| Journal Title: | Polar biology |
| Volume: | 44 |
| Issue: | 3 |
| Start Page: | 621 |
| End Page: | 629 |
| Publisher DOI: | 10.1007/s00300-021-02816-5 |
| Abstract: | Antarctic minke whales (Balaenoptera bonaerensis) are migratory capital breeders that experience intensive summer feeding on Antarctic krill (Euphausia superba) in the Southern Ocean and winter breeding at lower latitudes, but their prey outside of the Antarctic is unknown. Stable isotope analyses were conducted on delta C-13 and delta N-15 from the baleen plates of ten pregnant Antarctic minke whales to understand the growth rate of the baleen plate and their diet in lower latitudes. Two to three oscillations along the length of the edge of the baleen plate were observed in delta N-15, and the annual growth rate was estimated to be 75.2 +/- 20.4 mm, with a small amplitude (0.97 +/- 0.21 parts per thousand). Bayesian stable isotope mixing models were used to understand the dominant prey that contributed to the isotopic component of the baleen plate using Antarctic krill from the stomach contents and reported values of Antarctic coastal krill (Euphausia crystallorophias), Antarctic silver fish (Pleuragramma antarcticum), Australian krill spp., and Australian pelagic fish spp.. The models showed that the diet composition of the most recent three records from the base of the baleen plates (model 1) and the highest delta N-15 values in each baleen plate (model 2) were predominantly Antarctic krill, with a contribution rate of approximately 80%. The rates were approximately 10% for Antarctic coastal krill and less than 2.0% for the two Australian prey groups in both models. These results suggest that pregnant Antarctic minke whales did not feed on enough prey outside of the Antarctic to change the stable isotope values in their baleen plates. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/81344 |
| Appears in Collections: | 北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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