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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on January 23, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(3):469-476; doi:10.1093/icesjms/fsm194
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Seasonal appearance of expatriated boreal copepods in the Oyashio–Kuroshio mixed region

Toru Kobari1, Masatoshi Moku2 and Kazutaka Takahashi3

1 Aquatic Resource Science Division, Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan
2 Laboratory of Marine Resources and Environment Planning, Department of Fishery Science and Technology, National Fisheries University, 2-7-1 Nagata-Honmachi, Shimonoseki 759-6595, Japan
3 Biological Oceanography Section, Mixed Water Region Fisheries Oceanography Division, Tohoku National Fisheries Institute, 3-27-5 Shinhama, Shiogama, Miyagi 985-0001, Japan

Correspondence to T. Kobari: tel: +81 99 286 4140; fax: +81 99 286 4133; e-mail: kobari{at}fish.kagoshima-u.ac.jp

Kobari, T., Moku, M., and Takahashi, K. 2008. Seasonal appearance of expatriated boreal copepods in the Oyashio–Kuroshio mixed region. – ICES Journal of Marine Science, 65: 469–476.

Seasonal changes in abundance, biomass, and community structure of ontogenetically migrating copepods were investigated using monthly zooplankton samples from the Oyashio–Kuroshio mixed region (OKMR) to evaluate impacts of the copepod community expatriated from more northerly waters on carbon flow in southern areas. The copepod community comprised more than half the total zooplankton biomass and exhibited seasonal fluctuations, although they were minor components in terms of abundance. The ontogenetic migrants increased their abundance and biomass during May–July when Oyashio waters dominated at the surface. They were almost absent from 0 to 150 m during August to December. Predominant species were Eucalanus bungii and Metridia pacifica for abundance and Neocalanus cristatus for biomass. Seasonal changes in their abundance and stage composition indicated that surface development, dormancy, and reproduction were comparable in schedule with those reported in the Oyashio region. We suggest that the ontogenetically migrating copepods appearing in this area are populations transported with a southward Oyashio intrusion during surface development seasons, then by both downward migration and advection of dormant populations in the submerging Oyashio flow. We discuss impacts of the expatriated copepods on food availability for mesopelagic fish in the OKMR.

Keywords: community structure, copepods, ontogenetic migration, Oyashio–Kuroshio mixed region

Received 11 July 2007; accepted 22 November 2007; advance access publication 23 January 2008.


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