Articles | Volume 17, issue 1
Biogeosciences, 17, 35–45, 2020
https://doi.org/10.5194/bg-17-35-2020
Biogeosciences, 17, 35–45, 2020
https://doi.org/10.5194/bg-17-35-2020

Research article 03 Jan 2020

Research article | 03 Jan 2020

Arctic (Svalbard islands) active and exported diatom stocks and cell health status

Susana Agustí et al.

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Cited articles

Agustí, S., González-Gordillo, J. I., Vaqué, D., Estrada, M., Cerezo, M. I., Salazar, G., Gasol, J. M., and Duarte, C. M.: Ubiquitous healthy diatoms in the deep sea confirms deep carbon injection by the biological pump, Nat. Commun., 6, 7608, https://doi.org/10.1038/ncomms8608, 2015. 
Alou-Font, E., Roy, S., Agustí, S., and Gosselin, M.: Cell viability, pigments and photosynthetic performance of Arctic phytoplankton in contrasting ice-covered and open-water conditions during the spring-summer transition, Mar. Ecol.-Progr. Ser., 3, 89–106, 2016. 
Armbrecht, L. H., Smetacek, V., Assmy, P., and Klaas, C.: Cell death and aggregate formation in the giant diatom Coscinodiscus wailesii (Gran & Angst, 1931), J. Exp. Mar. Biol. Ecol., 452, 31–39, 2014. 
Aumack, C. F., Juhl, A. R., and Krembs, C.: Diatom vertical migration within land-fast Arctic sea ice, J. Marine Syst., 139, 496–504, 2014. 
Baines, S. B., Twining, B. S., Brzezinski, M. A., Nelson, D. M., and Fisher, N. S.: Causes and biogeochemical implications of regional differences in silicification of marine diatoms, Global Biogeochem. Cy., 24, GB4031, https://doi.org/10.1029/2010GB003856, 2010. 
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Short summary
We found that 24 % of the total diatoms community in the Arctic water column (450 m depth) was located below the photic layer. Healthy diatom communities in active spring–bloom stages remained in the photic layer. Dying diatom communities exported a large fraction of the biomass to the aphotic zone, fuelling carbon sequestration and benthic ecosystems in the Arctic. The results of the study conform to a conceptual model where diatoms grow during the bloom until silicic acid stocks are depleted.
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