Songs of humpback whales Megaptera novaeangliae in the Ryukyu and Bonin regions.

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概要

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• Changes in the songs of humpback whales Megaptera novaeangliae in the Ryukyu and Bonin regions of Japan were examined, and songs from the two regions were compared. Eighty-four song sessions in the Ryukyu region, from 1991 to 1997, and eleven song sessions in the Bonin region, from 1992 to 1995, were analyzed. The mean number of theme types was 6.9 for the Ryukyu samples and 7.6 for the Bonin samples. Song similarities were higher within winter than between winters and similarity declined as the number of intervening years increased, indicating that in these regions songs change with time. Song similarities for consecutive years varied, suggesting that the rate of change varies annually. Songs in the same year were very similar in both the Ryukyu and Bonin samples, furthermore site-specific theme types were not found. These results suggest there may be acoustic contact between animals using the two regions, supporting a previous photographic study which indicated that humpback whales migrate between these two regions.

• The Mammalogical Society of Japanの論文
• 2000-06-01

著者

• Takemura A

  Faculty Of Fisheries Nagasaki University

• Takemura Akira

  Faculty Of Fisheries Nagasaki University

• MAEDA Hidemasa

  Graduate School of Marine Science and Engineering, Nagasaki University

• HIGASHI Naoto

  Okinawa Exipo Aquarium

• UCHIDA Senzou

  Okinawa Exipo Aquarium

• SATO Fumihiko

  Ogasawara Marine Center

• YAMAGUCHI Manami

  Ogasawara Marine Center

• KOIDO Takashi

  Faculty of Fisheries, Nagasaki University

• Uchida S

  Okinawa Exipo Aquarium

• Koido T

  Nagasaki Univ. Nagasaki Jpn

• Koido Takashi

  Faculty Of Fisheries Nagasaki University

• Maeda Hidemasa

  Graduate School Of Marine Science And Engineering Nagasaki University

関連論文

• Songs of humpback whales Megaptera novaeangliae in the Ryukyu and Bonin regions.
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• Size distribution of the hard remains of prey in the digestive tract of northern fur seal (Callorhinus ursinus) and related biases in diet estimation by scat analysis
• Prey Size Reconstruction Based on Myctophid Otoliths in Scats of Northern Fur Seals (Callorhinus ursinus)
• Effect of photoperiod on gonadal steroid hormone levels and reproductive cycles of northern fur seals (Callorhinus ursinus)

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