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Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/60645

Title: Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific
Authors: Yamaguchi, Atsushi Browse this author →KAKEN DB
Watanabe, Yuji Browse this author
Ishida, Hiroshi Browse this author
Harimoto, Takashi Browse this author
Furusawa, Kazushi Browse this author
Suzuki, Shinya Browse this author
Ishizaka, Joji Browse this author
Ikeda, Tsutomu Browse this author →KAKEN DB
Mac Takahashi, Masayuki Browse this author
Keywords: Plankton
community structure
vertical distribution
mesopelagic
bethypelagic
abyssopelagic
biological pump
biogeochemical cycle
Issue Date: 2004
Publisher: Oceanographic Society of Japan
Journal Title: Journal of Oceanography
Volume: 60
Issue: 4
Start Page: 773
End Page: 787
Publisher DOI: 10.1007/s10872-004-5770-1
Abstract: As part of the research program WEST-COSMIC Phase I (1997–2001), vertical profiles down to the greater depths (0–2000 m or 5800 m) of the plankton community structure composed of heterotrophic bacteria, phytoplankton, protozooplankton and metazooplankton were studied at one station in each subarctic (44°N) and in transitional region (39°N), and two stations in subtropical region (30°N and 25°N); all in 137–155°E in the western North Pacific Ocean. The biomass of all four taxonomic groups decreased rapidly with increasing depths at all stations, although the magnitude of depth-related decrease differed among the groups. As plankton community structure, metazooplankton biomass and bacterial biomass occupied >50% of the total in 0–2000 and 2000–4000 or 5000 m strata, respectively, at subarctic and transitional stations, while bacterial biomass contributed to >50% of the total consistently from 0 through 4800 or 5800 m at subtropical stations. Metazooplankton biomass integrated over the greater depths exhibited a clear latitudinal pattern (high north and low south), but this was not the case for those of the other taxonomic groups. As a component of metazooplankton, an appreciable contribution of diapausing copepods to the metazooplankton was noted at subarctic and transitional stations, but they were few or nil at subtropical stations. As protozooplankton assemblages, heterotrophic microflagellates (HMF) and dinoflagellates were two major components at subarctic and transitional stations, but were only HMF predominated at subtropical stations. From biomass ratios between heterotrophic bacteria, HMF and dinoflagellates, “sinking POC-DOC-heterotrophic bacteria-HMF-heterotrophic dinoflagellates” link was proposed as a microbial food chain operative in the deep layer of the western North Pacific. All results are discussed in the light of latitudinal differences in the structure and functioning of plankton community contributing to the ‘biological pump’ in the western North Pacific Ocean.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s10872-004-5770-1.
Type: article (author version)
URI: http://hdl.handle.net/2115/60645
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 篤

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