Significant nutrient consumption in the dark subsurface layer during a diatom bloom: a case study on Funka Bay, Hokkaido, Japan

Abstract 3 - 4 3 -, and Si (OH) 4 decreased by half between these dates, even in the dark. Incubation experiments using the diatom Thalassiosira nordenskioeldii showed that this diatom could consume added nutrients in the dark at substantial rates after pre-culturing to deplete nutrients. Incubation experiments using natural seawater collected in the growing phase of the bloom on 8 March 2022 also showed that nutrient-depleted phytoplankton could consume added nutrients in the dark. We excluded three physical process – water mixing, diffusive transport, and subduction – as possible main reasons for the decrease in nutrients in the subsurface layer. We conclude that the nutrient reduction in the subsurface layer (30–50 m) between 4 and 15 March 2019 could be explained by nutrient consumption by diatoms in the dark in that layer.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Significant nutrient consumption in the dark subsurface layer during a diatom bloom: a case study on Funka Bay, Hokkaido, Japan ; volume:20 ; number:2 ; year:2023 ; pages:421-438 ; extent:18 ; Biogeosciences ; 20, Heft 2 (2023), 421-438 (gesamt 18)

Contributors, Places and Time

• Creator: Umezawa, Sachi ; Tozawa, Manami ; Nosaka, Yuichi ; Nomura, Daiki ; Onishi, Hiroji ; Abe, Hiroto ; Takatsu, Tetsuya ; Ooki, Atsushi

Further information

• DOI: 10.5194/bg-20-421-2023
• URN: urn:nbn:de:101:1-2023033007573308845502
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 14.08.2025, 10:53 AM CEST