Arsenate and microbial dynamics in different phosphorus regimes of the subtropical Pacific Ocean

Hashihama, Fuminori; Suwa, Shuhei; Kanda, Jun; Ehama, Makoto; Sakuraba, R.; Kinouchi, Shinko; Sato, Minoru; Yamaguchi, Takenori; Saito, Hiroaki; Ogura, Yoshitoshi; Hayashi, Tetsuya; Mori, Hiroshi; Kurokawa, Ken; Suzuki, Shinya; Hamasaki, Koji

doi:10.1016/j.pocean.2019.05.007

Cited by 13 publications

(24 citation statements)

References 48 publications

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“…The subtropical Pacific Ocean is the largest province in the global ocean (Karl & Church, 2019) and has several distinct biogeochemical domains as recently characterized by spatially nonuniform distributions of N 2 fixation (Shiozaki et al, 2010(Shiozaki et al, , 2014(Shiozaki et al, , 2018 and PO 4 concentrations (Ellwood et al, 2018;Hashihama et al, 2009Hashihama et al, , 2019Martiny et al, 2019). Given these spatial dynamics of N and P, the biogeochemical mechanism(s) for controlling TPP distributions appear not to be simple and may exhibit unique patterns across different regions.…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical Controls of Particulate Phosphorus Distribution Across the Oligotrophic Subtropical Pacific Ocean

Hashihama

Saito

Shiozaki

et al. 2020

Global Biogeochemical Cycles

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We investigated basin-wide distributions of total particulate phosphorus (TPP) and associated biogeochemical parameters in the euphotic zone (EZ) of the subtropical North and South Pacific Ocean. TPP is primarily composed of living microorganisms, and its distribution is likely controlled by nitrogen (N) supply in typical N-limited Pacific waters as well as phosphorus (P) supply in P-limited western North Pacific. TPP concentrations showed a vertically uniform distribution (approximately 15 nM) within the EZ at most stations, but at several northern North Pacific stations, TPP peaks (>20 nM) were observed in the lower EZ where nitrate and nitrite concentrations were high. Relationships between TPP and biogeochemical parameters indicate that a possible factor controlling TPP in the upper EZ was dinitrogen fixation and that in the lower EZ was shoaling of the nitracline. Geographical distribution of TPP was relatively uniform compared to that of phosphate, which varied from <10 nM in the western North Pacific to >100 nM in the eastern North and South Pacific. The western North Pacific was a domain characterized by lower dissolved organic P (DOP) concentrations, higher alkaline phosphatase activities, and higher particulate polyphosphate (PpolyP):TPP ratios compared to other domains. These characteristics indicated that active DOP utilization and PpolyP accumulation could play important roles in the maintenance of TPP stocks as alternatives to phosphate utilization in this distinctive domain. Our results demonstrated that TPP distributions were vertically and geographically uniform across the subtropical Pacific Ocean, concealing that TPP stocks were likely underpinned by a range of nutrient supply mechanisms.

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Section: Introductionmentioning

confidence: 99%

Biogeochemical Controls of Particulate Phosphorus Distribution Across the Oligotrophic Subtropical Pacific Ocean

Hashihama

Saito

Shiozaki

et al. 2020

Global Biogeochemical Cycles

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“…These negative bloom P* imply the presence of alternative P sources other than PO 4 to fully exhaust DIN. Since lower DOP concentrations and higher alkaline phosphatase activity were observed in the WNP than other subtropical Pacific regions (Hashihama et al, 2019), active DOP utilization in the WNP likely contributes to the DIN exhaustion. The DOP utilization in the WNP is enhanced at ~10 nM of PO 4 concentrations (Sato et al, 2013).…”

Section: Possible Influences Of the Subtropical Phytoplankton Blooms mentioning

confidence: 97%

“…Lomas et al (2014) reported that phytoplankton in the western subtropical North Atlantic have active PO 4 transporters which are rapidly induced under severely PO 4 -depleted condition. In addition, several studies have reported that microbial genes for high-affinity PO 4 transporter (pstSCAB) are enriched in the PO 4 -depleted regions in the western North Atlantic and WNP compared to the PO 4 -replete regions in the CNP and ESP (Coleman and Chisholm, 2010;Hashihama et al, 2019). These studies indicated that the phytoplankton in the PO 4 -depleted regions possess a high PO 4 uptake capability.…”

Section: N and P Drawdown Characteristicsmentioning

confidence: 99%

“…Surface P* at the experimental stations was calculated using the measured nanomolar PO 4 and DIN data through an equation P*=PO 4 -DIN/16. In addition, to reveal basin-wide distribution of surface (≤10 m) P* over the oligotrophic Pacific area (40° N-40° S), we assembled nanomolar (<1000 nM) data sets of PO 4 and NO 3 plus NO 2 (N+N), most of which were previously published by the authors in this study (Hashihama et al, 2009;Shiozaki et al, 2009;Sato et al, 2010;Shiozaki et al, 2010;Girault et al, 2013;Sato et al, 2013;Hashihama et al, 2014;Shiozaki et al, 2014;Girault et al, 2015;Sato et al, 2015;Sato et al, 2016;Shiozaki et al, 2016;Shiozaki et al, 2017;Ellwood et al, 2018;Shiozaki et al, 2018;Hashihama et al, 2019;Martiny et al, 2019;Sato and Hashihama, 2019;Yamaguchi et al, 2019;Hashihama et al submitted;Jiang et al submitted;Yamaguchi et al submitted). We also included several unpublished data sets collected by F.…”

Section: P* Determination Using Nanomolar Nutrient Datamentioning

confidence: 99%

“…In this study, our aim was to reveal N, P, and Si assimilation characteristics of subtropical phytoplankton blooms as induced by deep water additions. The onboard bottle incubation experiments were conducted across the subtropical Pacific Ocean, which has a large geographical variation in surface PO4 from very low (<10 nM) in the western North Pacific (WNP) to high (>100 nM) in the eastern South Pacific (ESP) (Hashihama et al, 2019;Martiny et al, 2019). Since subtropical phytoplankton respond to nanomolar increases in nutrient concentrations (Garside, 1985;Eppley and Renger, 1988;Eppley et al, 1990), we used sensitive liquid waveguide spectrophotometry for measuring nanomolar NO 3 , NO 2 , NH 4 , PO 4 , and Si(OH) 4 .…”

Section: Introductionmentioning

confidence: 99%

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Cross-basin differences in the nutrient assimilation characteristics of induced phytoplankton blooms in the subtropical Pacific waters

Hashihama¹,

Saito²,

Kodama³

et al. 2020

Preprint

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Abstract. To better understand the nutrient assimilation characteristics of subtropical phytoplankton, deep water addition incubation experiments were carried out on surface waters collected at seven stations across the subtropical North and South Pacific Ocean. These deep water additions induced phytoplankton blooms with nutrient drawdown at all stations. The drawdown ratios of dissolved inorganic nitrogen (DIN) to phosphate (PO4) varied from 14.1 to 29.6 at the PO4-replete stations in the central North Pacific (CNP) and eastern South Pacific (ESP). These ratios were similar to the range represented by the canonical Redfield ratio (16) through to typical particulate N:P ratios in the surface subtropical ocean (28). In contrast, lower DIN:PO4 drawdown ratios (8.0–12.9) were observed in induced blooms at the PO4-depleted stations in the western North Pacific (WNP). The DIN:PO4 drawdown ratios in the PO4-replete ESP were associated with eukaryote-dominated blooms, while those in PO4-depleted WNP were associated with eukaryotic and cyanobacterial blooms. The surplus PO4 assimilation, relative to DIN, by phytoplankton in the WNP was not expected based on their typical cellular N:P ratio, and was likely due to the high PO4 uptake capability as induced by low PO4-adapted phytoplankton. The low and high P* (=PO4-DIN/16) regimes geographically corresponded to the low and high DIN:PO4 drawdown ratios in the WNP and the CNP or ESP, respectively. The basin-wide P* distribution in the oligotrophic Pacific surface waters showed a clear regional trend from low in the WNP (<50 nM) to high in the ESP (>100 nM). These results suggest that the subtropical phytoplankton blooms as observed in our experiments could be an important factor controlling P* as well as the commonly recognized dinitrogen fixation and denitrification characteristics.

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Biogeochemistry of organic phosphorus in the sea: Advances, challenges, and opportunities

Karl,

Björkman

2024

Biogeochemistry of Marine Dissolved Organic Matter

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Arsenate and microbial dynamics in different phosphorus regimes of the subtropical Pacific Ocean

Cited by 13 publications

References 48 publications

Biogeochemical Controls of Particulate Phosphorus Distribution Across the Oligotrophic Subtropical Pacific Ocean

Biogeochemical Controls of Particulate Phosphorus Distribution Across the Oligotrophic Subtropical Pacific Ocean

Cross-basin differences in the nutrient assimilation characteristics of induced phytoplankton blooms in the subtropical Pacific waters

Biogeochemistry of organic phosphorus in the sea: Advances, challenges, and opportunities

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