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

Seasonal changes in abundance and development of Calanus pacificus (Crustacea: Copepoda) in the... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

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

Marine Biology , Volume 144 (4) – Dec 18, 2003

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References (31)

Publisher
Springer Journals
Copyright
Copyright © 2003 by Springer-Verlag
Subject
LifeSciences
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/s00227-003-1244-z
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Marine BiologySpringer Journals

Published: Dec 18, 2003

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