Nutrient and plankton dynamics in the Oyashio region of the western subarctic Pacific Ocean

Saito, Hiroaki; Tsuda, Atsushi; Kasai, Hiromi

doi:10.1016/s0967-0645(02)00204-7

Cited by 139 publications

(100 citation statements)

References 63 publications

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“…9e), which implies variable phytoplankton utilization and growth under different macro-and micronutrient environments. Apparently surface Chl-a was controlled by light availability and physical dilution of phytoplankton biomass in the mixed layer, as reported previously for the Oyashio region (Saito et al, 2002) and for mesoscale in situ iron-fertilization experiments (de Baar et al, 2005). That is, in the present study, the cold water mass with shallower MLD had higher Chl-a concentration, while the warmer water mass with deeper MLD had lower Chl-a (Fig.…”

Section: The Mld and Spring Bloomsupporting

confidence: 78%

“…5) may decrease nitrate uptake (Dortch et al, 1991), which would enhance Si utilization compared to N+N and/or lead to N+N remaining utilized, as observed for HNLC-like conditions in the Oyashio region (Saito et al, 2002). The present study partly illustrates that the warmer water type could be significantly linked to HNLC-like conditions in subsurface layer of the Oyashio region (Saito et al, 2002). (Fig.…”

Section: Warmer Water Systemsupporting

confidence: 68%

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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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Section: The Mld and Spring Bloomsupporting

confidence: 78%

Section: Warmer Water Systemsupporting

confidence: 68%

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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“…In the Oyashio region, the highest primary production occurs between April and May (Kasai, 2000;Saito et al, 2002). During this bloom period, the main population of N. cristatus undergoes a rapid development to stage C5 at the surface, and then migrates in summer/autumn to deeper layers (below 500 m) to undergo diapause.…”

Section: Discussionmentioning

confidence: 99%

“…An extensive area of the subarctic Pacific is known as one of the high-nutrient low-chlorophyll (HNLC) regions, however, the Oyashio region is characterized by substantial spring phytoplankton blooming and consequently high production of higher trophic levels (Taniguchi and Kawamura, 1972;Taniguchi, 1999;Saito et al, 2002). In the ecosystem of the Oyashio region, large calanoid copepods are important constituents of zooplankton comprising 80-90% of the zooplankton biomass (Vinogradov, 1970;Ikeda et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Lipid and fatty acid/alcohol compositions of the subarctic copepods Neocalanus cristatus and Eucalanus bungii from various depths in the Oyashio region, western North Pacific

Yamada

Nishida

Graeve

et al. 2016

Comparative Biochemistry and Physiology Part B: Biochemistry an

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Lipids of Neocalanus cristatus and Eucalanus bungii (C3 to adults), collected in March, May, and December from various depths (0-2000 m) were studied in the Oyashio region, western North Pacific. Total lipid and wax ester contents of younger N. cristatus stages increased during the development, being higher in May than in March and December. Major fatty acids of younger N. cristatus were 16:0, 20:5(n−3), and 22:6(n−3) and the dominant alcohols were 16:0, 16:1(n − 7), 20:1(n − 9)/(n −11) and 22:1(n −11). The energy-rich 20:1 and 22:1 moieties increased from the younger to the adult stages showing the importance of lipid biosynthesis which may be advantageous for successful overwintering and reproduction at depth. The 16:4(n − 1) fatty acid, characteristic of a diatom diet increased in May, particularly in the younger stages. Our results suggest that the diatom-dominated feeding mode of younger N. cristatus during the spring bloom is important for an effective accumulation of wax esters. In contrast to N. cristatus, E. bungii accumulated substantial amounts of triacylglycerols. The total lipid and triacylglycerol content increased slightly toward the older developmental stages. The major fatty acids were 16:0, 16:1(n−7), 18:1(n−9) and (n−7), and 20:5(n−3). There was no evidence of developmental or seasonal changes in the fatty acid composition. The differences in the lipid storage modes of both copepods via wax esters or triacylglycerols are species-specific but their fatty acid compositions varied according to diet and developmental stage, especially in N. cristatus. These lipid characteristics are discussed in relation to reproduction, feeding modes, diapause and overwintering strategies.

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“…Hokkaido National Fisheries Research Institute (HNFRI) maintains a repeat hydrographic observation line called A-line (Kasai et al, 1997(Kasai et al, , 2001Saito et al, 1998Saito et al, , 2002 in the Oyashio region, and 16 cross-sections of carbon parameters such as DIC and titration alkalinity (Talk) along this line have been observed intermittently from 1996 to the present (Table 1, map shown in Fig. 1 (Midorikawa et al, 2003).…”

Section: Datamentioning

confidence: 99%

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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Nutrient and plankton dynamics in the Oyashio region of the western subarctic Pacific Ocean

Cited by 139 publications

References 63 publications

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

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

Lipid and fatty acid/alcohol compositions of the subarctic copepods Neocalanus cristatus and Eucalanus bungii from various depths in the Oyashio region, western North Pacific

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

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