Seasonal changes in abundance and development of Calanus pacificus (Crustacea: Copepoda) in the Oyashio–Kuroshio Mixed Region

T. Kobari; T. Nagaki; K. Takahashi

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Seasonal changes in abundance and development of Calanus pacificus (Crustacea: Copepoda) in the Oyashio–Kuroshio Mixed Region

机译：Seasonal changes in abundance and development of Calanus pacificus (Crustacea: Copepoda) in the Oyashio–Kuroshio Mixed Region

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Seasonal changes in abundance and development of Calanus pacificus Brodsky were investigated by analyzing samples of different depth strata (0–150 m and 0–1000 m) collected monthly in the Oyashio–Kuroshio Mixed Region. Copepodite stage 5 (C5) emerged from dormancy and matured in early summer. A new generation appeared in July and developed into C5 during summer to autumn. Some of the summer generation arrested development at C5 and persisted below 150 m depth until the following early summer. Although the remainder matured and reproduced in October, a new generation was not observed at the surface during winter. These results suggest that C. pacificus shows two different life-cycle patterns, i.e. one generation annually, with overwintering C5 in deep waters, and two generations annually, with surface development during autumn to winter. The complex life-cycle patterns may be an adaptation to the highly fluctuating surface environment in the Oyashio–Kuroshio Mixed Region.

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《Marine Biology: International Journal on Life in Oceans and Coastal Waters》 |2004年第4期|713-721|共9页
作者
T. Kobari; T. Nagaki; K. Takahashi;
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作者单位

Aquatic Resource Science Laboratory, Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, 890-0056 Kagoshima, Japan;

Miyagi Prefecture Fisheries Research and Development Center, 97-6 Sodenohama, Watanoha, 986-2135 Ishinomaki, Japan;

Biological Oceanography Section, Mixed Water Region Fisheries Oceanography Division, Tohoku National Fisheries Research Institute, 3-27-5 Shinhama-cho, 985-0001 Shiogama, Japan;

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中图分类环境生物学;
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Seasonal changes in abundance and development of Calanus pacificus (Crustacea: Copepoda) in the Oyashio–Kuroshio Mixed Region

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