Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates
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 w...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/81344 2023-05-15T13:51:33+02:00 Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates Uchida, Mayuka Suzuki, Ippei Ito, Keizo Ishizuka, Mayumi Ikenaka, Yoshinori Nakayama, Shouta M. M. Tamura, Tsutomu Konishi, Kenji Bando, Takeharu Mitani, Yoko http://hdl.handle.net/2115/81344 https://doi.org/10.1007/s00300-021-02816-5 eng eng Springer http://hdl.handle.net/2115/81344 Polar biology, 44(3): 621-629 http://dx.doi.org/10.1007/s00300-021-02816-5 Feeding record Stable isotope analysis Baleen plate Antarctic minke whales Antarctic 460 article fthokunivhus https://doi.org/10.1007/s00300-021-02816-5 2022-11-18T01:06:26Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Balaenoptera bonaerensis Euphausia superba Polar Biology Southern Ocean Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Southern Ocean The Antarctic Polar Biology 44 3 621 629 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Feeding record Stable isotope analysis Baleen plate Antarctic minke whales Antarctic 460 |
spellingShingle |
Feeding record Stable isotope analysis Baleen plate Antarctic minke whales Antarctic 460 Uchida, Mayuka Suzuki, Ippei Ito, Keizo Ishizuka, Mayumi Ikenaka, Yoshinori Nakayama, Shouta M. M. Tamura, Tsutomu Konishi, Kenji Bando, Takeharu Mitani, Yoko Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
topic_facet |
Feeding record Stable isotope analysis Baleen plate Antarctic minke whales Antarctic 460 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Uchida, Mayuka Suzuki, Ippei Ito, Keizo Ishizuka, Mayumi Ikenaka, Yoshinori Nakayama, Shouta M. M. Tamura, Tsutomu Konishi, Kenji Bando, Takeharu Mitani, Yoko |
author_facet |
Uchida, Mayuka Suzuki, Ippei Ito, Keizo Ishizuka, Mayumi Ikenaka, Yoshinori Nakayama, Shouta M. M. Tamura, Tsutomu Konishi, Kenji Bando, Takeharu Mitani, Yoko |
author_sort |
Uchida, Mayuka |
title |
Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
title_short |
Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
title_full |
Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
title_fullStr |
Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
title_full_unstemmed |
Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
title_sort |
estimation of the feeding record of pregnant antarctic minke whales (balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates |
publisher |
Springer |
url |
http://hdl.handle.net/2115/81344 https://doi.org/10.1007/s00300-021-02816-5 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Balaenoptera bonaerensis Euphausia superba Polar Biology Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Balaenoptera bonaerensis Euphausia superba Polar Biology Southern Ocean |
op_relation |
http://hdl.handle.net/2115/81344 Polar biology, 44(3): 621-629 http://dx.doi.org/10.1007/s00300-021-02816-5 |
op_doi |
https://doi.org/10.1007/s00300-021-02816-5 |
container_title |
Polar Biology |
container_volume |
44 |
container_issue |
3 |
container_start_page |
621 |
op_container_end_page |
629 |
_version_ |
1766255458075541504 |