Articles | Volume 20, issue 2
https://doi.org/10.5194/bg-20-421-2023
https://doi.org/10.5194/bg-20-421-2023
Research article
 | 
27 Jan 2023
Research article |  | 27 Jan 2023

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

Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki

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Cited articles

Ban, S., Lee, H-W., Shinada, A., and Toda, T.: In situ egg production and hatching success of the marine copepod Pseudocalanus newmani in Funka Bay and adjacent waters off southwestern Hokkaido, Japan: associated to diatom bloom, J. Plankton Res., 22, 907–922, 2000. 
Cochlan, W. P., Price, N. M., and Harrison, P. J.: Effects Of Irradiance On Nitrogen Uptake By Phytoplankton – Comparison Of Frontal And Stratified Communities, Mar. Ecol. Prog. Ser., 69, 103–116, https://doi.org/10.3354/meps069103, 1991. 
Conway, H. L. and Whitledge, T. E.: Distribution, Fluxes And Biological Utilization Of Inorganic Nitrogen During A Spring Bloom In The New-York Bight, J. Mar. Res., 37, 657–668, 1979. 
Cullen, J. J. and Horrigan, S. G.: Effects Of Nitrate On The Diurnal Vertical Migration, Carbon To Nitrogen Ratio, And The Photosynthetic Capacity Of The Dinoflagellate Gymnodinium-Splendens, Mar. Biol., 62, 81–89, https://doi.org/10.1007/bf00388169, 1981. 
Dobashi, R., Ueno, H., Okada, Y., Tanaka, T., Nishioka, J., Hirawake, T., Ooki, A., Itoh, S., Hasegawa, D., Sasai, Y., Sasaki, H., and Yasuda, I.: Observations of anticyclonic eddies in the western subarctic North Pacific, J. Oceanogr., 77, 229–242, https://doi.org/10.1007/s10872-020-00586-y, 2021. 
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Short summary
We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.
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