Seasonal dynamics of planktonic food chain in the Oyashio region, western subarctic Pacific

Shinada, Akiyoshi; Ikeda, Tsutomu; Ban, Syuhei; Tsuda, Atsushi

doi:10.1093/plankt/23.11.1237

Cited by 54 publications

(31 citation statements)

References 56 publications

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“…The inventory of Chla in the upper 200 m of the water column is at most 100 mg/m 2 in KNOT (Liu et al, 2002) while it is greater than 260 mg/m 2 in the Oyashio region at the time of peak spring bloom (Saito et al, 2002). Although diatoms with <2 µn diameter dominate in both Oyashio and KNOT in the non-bloom period (Shinada et al, 2001;Imai et al, 2002), high productivity is often associated with large-sized diatoms in the Oyashio region (e.g., Odate, 1996), while the size-composition of Chla does not change significantly between in-bloom and out-of-bloom periods at Stn. KNOT .…”

Section: Similarity and Difference In Dynamics Of Dic Between Wsnp Anmentioning

confidence: 97%

Seasonal and Interannual Variation of DIC in Surface Mixed Layer in the Oyashio Region: A Climatological View

Ono¹,

Kasai²,

Midorikawa

et al. 2005

J Oceanogr

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Section: Similarity and Difference In Dynamics Of Dic Between Wsnp Anmentioning

confidence: 97%

Seasonal and Interannual Variation of DIC in Surface Mixed Layer in the Oyashio Region: A Climatological View

Ono¹,

Kasai²,

Midorikawa

et al. 2005

J Oceanogr

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“…The situation may be reversed when the biological pump is weak (ocean a source of CO2) (Longhurst and Harrison, 1989). The function of the biological pump could vary from one oceanic region to another, depending on the structure of the plankton communities and abundance of the component organisms which determine the pathway of carbon through planktonic food webs, as was demonstrated in the eastern North Pacific Ocean (Booth et al, 1993;Boyd et al, 1995), western North Pacific Ocean (Shinada et al, 2001), equatorial Pacific Ocean (Ishizaka et al, 1997), subtropical Pacific Ocean (Bradford-Grieve et al, 1999), off Bermuda , North Sea (Nielsen et al, 1993), and Baltic Sea (Uitto et al, 1997). However, all these previous studies are concerned with plankton communities in the epipelagic zone, and comparable information about the plankton community structure in the mesopelagic and bathypelagic zones is extremely limited (cf.…”

Section: Introductionmentioning

confidence: 99%

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

Yamaguchi

Watanabe²,

Ishida³

et al. 2004

Journal of Oceanography

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As part of the research program WEST-COSMIC Phase I (1997, 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, metazooplankiton 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 NorthPacific. 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.

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“…8 a, b, c; and see the water mass mixing ratio described by Kono and Sato, this issue). However, as stated earlier, respiration of organisms other than bacteria and microzooplankton was ignored in the present estimates, and they may contribute up to a third of the community respiration (Shinada et al, 2001). This missing third (approximately) implies that the estimated macronutrient remineralizations potentially were 8.7-58% of N+N, 5.3-41% of P, and 3.8-26% of Si.…”

Section: Culture Experimentsmentioning

confidence: 75%

“…In addition, the amount of oxygen utilization other than by bacteria could be overestimated for purposes of estimating [Nut] winter in a relatively shallow and heterotrophic biomass-rich water column like that observed in the present study. During the spring bloom period in the Oyashio region, Shinada et al (2001) reported that bacterial and microzooplankton production was approximately 67% of the secondary production. That indicates that normalized values of AOU could be overestimated by two-thirds, i.e., estimated [Nut] winter values could be underestimated and the gap amount may be transferred to higher trophic levels.…”

Section: Discussionmentioning

confidence: 99%

Nutrient and diatom dynamics during late winter and spring in the Oyashio region of the western subarctic Pacific Ocean

Sugie

Kuma

Fujita

et al. 2010

Deep Sea Research Part II: Topical Studies in Oceanography

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We investigated the nutrient and diatom dynamics during late winter and spring These results suggest that the spring bloom in the cold water system with high macronutrients and iron concentrations would progress rapidly and intensely, and then be terminated by nitrogenous nutrient depletion. However, the diatom bloom in warmer waters with lower macronutrients and iron concentrations would be terminated by Si-and/or iron-limitation of heavily-silicified diatoms. In the OECOS study, variation of macronutrients and iron due to the surface intrusions of several water masses and modification from different chemical conditions during winter were the most important factors regulating the progression, magnitude and probably fate of the spring phytoplankton bloom in the Oyashio region.2

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Seasonal dynamics of planktonic food chain in the Oyashio region, western subarctic Pacific

Cited by 54 publications

References 56 publications

Seasonal and Interannual Variation of DIC in Surface Mixed Layer in the Oyashio Region: A Climatological View

Seasonal and Interannual Variation of DIC in Surface Mixed Layer in the Oyashio Region: A Climatological View

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

Nutrient and diatom dynamics during late winter and spring in the Oyashio region of the western subarctic Pacific Ocean

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