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Untangling hidden n...
Untangling hidden nutrient dynamics : rapid ammonium cycling and single-cell ammonium assimilation in marine plankton communities
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- Klawonn, Isabell (author)
- Stockholms universitet,Institutionen för ekologi, miljö och botanik,GB-Leibniz-Institute ofFreshwater Ecology and Inland Fisheries, Germany
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- Bonaglia, Stefano (author)
- Stockholms universitet,Institutionen för ekologi, miljö och botanik,Institutionen för geologiska vetenskaper
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- Whitehouse, Martin J., 1962- (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Nordsim
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Littmann, Sten (author)
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Tienken, Daniela (author)
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Kuypers, Marcel M. M. (author)
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- Brüchert, Volker (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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- Ploug, Helle (author)
- Gothenburg University,Göteborgs universitet,Stockholms universitet,Institutionen för ekologi, miljö och botanik,University of Gothenburg, Sweden,Institutionen för marina vetenskaper,Department of marine sciences
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(creator_code:org_t)
- 2019-03-25
- 2019
- English.
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In: The ISME Journal. - : Springer Science and Business Media LLC. - 1751-7362 .- 1751-7370. ; 13:8, s. 1960-1974
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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 (15N-ammonium, 15N2 and 13C-bicarbonate) with secondary-ion mass spectrometry, we quantified bulk ammonium dynamics, N2-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 (N2-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. N2-fixing cyanobacteria poorly assimilated ammonium, whereas heterotrophic bacteria and picocyanobacteria accounted for its highest consumption (~20 and ~20–40%, respectively). Surprisingly, ammonium assimilation and C-fixation were similarly fast for picocyanobacteria (non-N2-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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Annan naturvetenskap (hsv//swe)
- NATURAL SCIENCES -- Other Natural Sciences (hsv//eng)
Keyword
- Biogeochemistry
- biogeokemi
- miljövetenskap
- Environmental Sciences
- Ecosystems and species history
Publication and Content Type
- ref (subject category)
- art (subject category)
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