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Patterns of stable carbon and nitrogen isotopes in the baleen of common minke whale Balaenoptera acutorostrata from the western North Pacific

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Abstract

Stable carbon and nitrogen isotope ratios were determined in the baleen plates of 17 common minke whales Balae noptera acutorostrata from the north-western Pacific Ocean off Japan, as well as prey species (krill Euphausia pacifica, Japanese anchovy Engraulis japonicus and Pacific saury Cololabis saira) collected in the stomach contents, to investigate the trophic relationship between the minke whales and their prey. A few δ15N-depleted peaks occurred along the length of baleen plates for 10 males irrespective of stomach content (anchovies and sauries). Similar δ15N-depleted peaks were also found for one female and two immature individuals. It was likely that these δ15N-depleted peaks formed in early summer. The stable nitrogen isotope ratio (δ15N) values in Pacific saury (9.3±1.4‰) did not differ significantly from that in Japanese anchovy (8.8±0.9‰). In contrast. δ15N in krill (7.2±0.5‰ in July and 8.0±0.2‰ in September) were significantly lower than in the Pacific saury. Thus, these peaks may reflect the dietary change from krill to fishes in the feeding migration of the whales. Growth rate of the baleen plate was estimated to be 129 mm/y, and it appeared that a dietary record of about 1.4 years remained in the baleen plate. For two immature whales, the maximum value of δ15N occurred at the tip of baleen. This δ15N enrichment may possibly be useful for discriminating weanlings and older whales.

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Author notes

  1. Yoko Mitani

    Present address: Texas A & M University at Galveston, 5007 Avenue U, 77551, Galveston, TX, USA

  2. Noriyuki Takai

    Present address: Shimoda Marine Biological Station, College of Bioresource Sciences, Nihon University, 415-0014, Shimoda, Shizuoka, Japan

  3. Wataru Sakamoto

    Present address: Kinki University, 3153, Shirahama-cho, Nishimuro-gun, 649-2211, Wakayama, Japan

Authors and Affiliations

  1. Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, 606-8502, Sakyo, Kyoto, Japan

    Yoko Mitani, Noriyuki Takai & Wataru Sakamoto

  2. The Institute of Cetacean Research, 4-18, Chuo, 104-0055, Tokyo, Japan

    Takeharu Bando

Authors
  1. Yoko Mitani
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  2. Takeharu Bando
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  3. Noriyuki Takai
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  4. Wataru Sakamoto
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Correspondence to Yoko Mitani.

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Mitani, Y., Bando, T., Takai, N. et al. Patterns of stable carbon and nitrogen isotopes in the baleen of common minke whale Balaenoptera acutorostrata from the western North Pacific. Fish Sci 72, 69–76 (2006). https://doi.org/10.1111/j.1444-2906.2006.01118.x

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  • DOI: https://doi.org/10.1111/j.1444-2906.2006.01118.x

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