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Transport of subarctic large copepods from the Oyashio area to the mixed water region by the coastal Oyashio intrusion

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The lateral transport of organic carbon in large grazing copepods (Neocalanus cristatus, Neocalanus flemingeri, Neocalanus plumchrus and Eucalanus bungii) from the Oyashio area to the mixed water region (MWR) by the coastal Oyashio intrusion was estimated using the data of VMPS (vertical multiple plankton sampler) and 1500 dbar-referred geostrophic transport from the CTD (conductivity temperature depth sensor) data of five cruises during June 2001 to April 2002 on a repeat observation section OICE (Oyashio Intensive observation line off Cape Erimo), which extends southeastward from Hokkaido Island, Japan. The transport to MWR by the coastal Oyashio intrusion was estimated to be 5.3 × 1011 g C for the four species. Data from profiling floats also indicated that the copepods were advected from OICE to MWR by the coastal Oyashio intrusion within about 2 months. This transport is considered to be one of the significant sources of organic carbon in MWR as it is larger than the amount of large zooplankton consumed by Pacific saury (Cololabis saira) in MWR, one of the dominant copepod predators in this region.

Keywords: Oyashio; carbon transport; copepods; mixed water region

Document Type: Research Article


Affiliations: 1: Tohoku National Fisheries Research Institute, Shinhama 3-27-5, Shiogama, Miyagi 985-0001, Japan 2: Research Institute for Global Change, JAMSTEC, Showa-Machi 3173-25, Kanazawaku, Yokohama, Japan 3: Ocean Research Institute, University of Tokyo, 1-15-1, Minamidai, Nakanoku, Tokyo 164-8639, Japan 4: Hokkaido National Fisheries Research Institute, Katsurakoi 116, Kushiro, Hokkaido 085-0802, Japan 5: Japan Marine Science Foundation, Minatocho 4-24, Mutsu, Aomori 035-0064, Japan

Publication date: September 1, 2009

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