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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

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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
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
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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