Diel activity and vertical distribution of Lysianassoid amphipods dominant in Onagawa Bay, north-eastern Japan

Atsushi Takekawa, Koichi Sasaki, Michio Omori

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Baited traps were used over 24 h to reveal the diel activity and vertical distribution of three dominant lysianassoid amphipods (Scopelocheirus onagawae, Anonyx omorii, Anonyx abei) in Onagawa Bay, north-eastern Japan. The three species were the most dominant small crustacean scavengers in the bay. Most individuals were caught by traps deployed 0.3 m above the bottom, showing that they were active in the layers close to the sea bottom. No habitat segregation was found among species or developmental stages, suggesting that these scavengers rely on the food supply from bottom deposits. The three species increased remarkably in numbers of collected individuals at night, showing a rise in feeding activity. The two Anonyx species were collected only during the night, and S. onagawae was collected mostly during the night. The nocturnal activity appears to be an adaptation to reduce predation risks. However, juveniles of S. onagawae appeared even during the day, suggesting that feeding might take precedence over avoiding predation. Baited traps collected ovigerous females of S. onagawae but not of Anonyx species; the reason for the difference could not be determined.

本文言語English
ページ(範囲)971-977
ページ数7
ジャーナルFisheries Science
70
6
DOI
出版ステータスPublished - 2004 12 1

ASJC Scopus subject areas

  • Aquatic Science

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