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

Hashihama, F; Saito, H; Kodama, T; Yasui-Tamura, S; Kanda, J; Tanita, I; Ogawa, H; Woodward, EMS; Boyd, PW; Furuya, K. 2021 Cross-basin differences in the nutrient assimilation characteristics of induced phytoplankton blooms in the subtropical Pacific waters. Biogeosciences, 18 (3). 897-915. https://doi.org/10.5194/bg-18-897-2021

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Abstract/Summary

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 30.7 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 V P ratios in the surface subtropical ocean (28). In contrast, lower DIN V PO4 drawdown ratios (7.7–13.3) were observed in induced blooms at the PO4-depleted stations in the western North Pacific (WNP). The DIN V PO4 drawdown ratios in the PO4-replete ESP were associated with eukaryote-dominated blooms, while those in the 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 V P ratio and was likely due to the high PO4 uptake capability as induced by low-PO4-adapted phytoplankton. The low- and high-P (D PO4

Item Type: Publication - Article
Subjects: Chemistry
Marine Sciences
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: Malcolm Woodward
Date made live: 11 Feb 2021 10:10
Last Modified: 11 Feb 2021 10:10
URI: http://plymsea.ac.uk/id/eprint/9118

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