Untangling hidden nutrient dynamics: rapid ammonium cycling and single-cell 
ammonium assimilation in marine plankton communities

Klawonn, Isabell; Bonaglia, Stefano; Whitehouse, Martin J.; Littmann, Sten; Tienken, Daniela; Kuypers, Marcel M. M.; Bruchert, Volker; Ploug, Helle

doi:10.1038/s41396-019-0386-z

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学術論文

Untangling hidden nutrient dynamics: rapid ammonium cycling and single-cell ammonium assimilation in marine plankton communities

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Littmann, Sten
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

Tienken, Daniela
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Kuypers, Marcel M. M.
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

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引用

Klawonn, I., Bonaglia, S., Whitehouse, M. J., Littmann, S., Tienken, D., Kuypers, M. M. M., Bruchert, V., & Ploug, H. (2019). Untangling hidden nutrient dynamics: rapid ammonium cycling and single-cell ammonium assimilation in marine plankton communities. The ISME Journal, 13(8), 1960-1974. doi:10.1038/s41396-019-0386-z.

引用: https://hdl.handle.net/21.11116/0000-0005-C275-C

要旨

Ammonium is a central nutrient in aquatic systems. Yet, cell-specific
ammonium assimilation among diverse functional plankton is poorly
documented in field communities. Combining stable-isotope incubations
(N-15-ammonium, N-15(2) and C-13-bicarbonate) with secondary-ion mass
spectrometry, we quantified bulk ammonium dynamics, N-2-fixation and
carbon (C) fixation, as well as single-cell ammonium assimilation and
C-fixation within plankton communities in nitrogen (N)-depleted surface
waters during summer in the Baltic Sea. Ammonium production resulted
from regenerated (>= 91%) and new production (N-2-fixation, <= 9%),
supporting primary production by 78-97 and 2-16%, respectively. Ammonium
was produced and consumed at balanced rates, and rapidly recycled within
1 h, as shown previously, facilitating an efficient ammonium transfer
within plankton communities. N-2-fixing cyanobacteria poorly assimilated
ammonium, whereas heterotrophic bacteria and picocyanobacteria accounted
for its highest consumption (similar to 20 and similar to 20-40%,
respectively). Surprisingly, ammonium assimilation and C-fixation were
similarly fast for picocyanobacteria (non-N-2-fixing Synechococcus) and
large diatoms (Chaetoceros). Yet, the population biomass was high for
Synechococcus but low for Chaetoceros. Hence, autotrophic
picocyanobacteria and heterotrophic bacteria, with their high
single-cell assimilation rates and dominating population biomass,
competed for the same nutrient source and drove rapid ammonium dynamics
in N-depleted marine waters.