Search: onr:"swepub:oai:gup.ub.gu.se/285482" >
Distinct nitrogen c...
Distinct nitrogen cycling and steep chemical gradients in Trichodesmium colonies.
-
- Klawonn, Isabell (author)
- Stockholms universitet,Institutionen för ekologi, miljö och botanik,IGB-Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Germany
-
- Eichner, Meri (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
-
Wilson, Samuel T (author)
-
show more...
-
Moradi, Nasrollah (author)
-
Thamdrup, Bo (author)
-
Kümmel, Steffen (author)
-
Gehre, Matthias (author)
-
Khalili, Arzhang (author)
-
Grossart, Hans-Peter (author)
-
Karl, David M (author)
-
- Ploug, Helle (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
-
show less...
-
(creator_code:org_t)
- 2019-10-21
- 2020
- English.
-
In: The ISME journal. - : Springer Science and Business Media LLC. - 1751-7370 .- 1751-7362. ; 14, s. 399-412
- Related links:
-
https://www.nature.c...
-
show more...
-
https://doi.org/10.1...
-
https://gup.ub.gu.se...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- Trichodesmium is an important dinitrogen (N2)-fixing cyanobacterium in marine ecosystems. Recent nucleic acid analyses indicate that Trichodesmium colonies with their diverse epibionts support various nitrogen (N) transformations beyond N2 fixation. However, rates of these transformations and concentration gradients of N compounds in Trichodesmium colonies remain largely unresolved. We combined isotope-tracer incubations, micro-profiling and numeric modelling to explore carbon fixation, N cycling processes as well as oxygen, ammonium and nitrate concentration gradients in individual field-sampled Trichodesmium colonies. Colonies were net-autotrophic, with carbon and N2 fixation occurring mostly during the day. Ten percent of the fixed N was released as ammonium after 12-h incubations. Nitrification was not detectable but nitrate consumption was high when nitrate was added. The consumed nitrate was partly reduced to ammonium, while denitrification was insignificant. Thus, the potential N transformation network was characterised by fixed N gain and recycling processes rather than denitrification. Oxygen concentrations within colonies were ~60-200% air-saturation. Moreover, our modelling predicted steep concentration gradients, with up to 6-fold higher ammonium concentrations, and nitrate depletion in the colony centre compared to the ambient seawater. These gradients created a chemically heterogeneous microenvironment, presumably facilitating diverse microbial metabolisms in millimetre-sized Trichodesmium colonies.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Klawonn, Isabell
-
Eichner, Meri
-
Wilson, Samuel T
-
Moradi, Nasrolla ...
-
Thamdrup, Bo
-
Kümmel, Steffen
-
show more...
-
Gehre, Matthias
-
Khalili, Arzhang
-
Grossart, Hans-P ...
-
Karl, David M
-
Ploug, Helle
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Earth and Relate ...
-
and Oceanography Hyd ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Biological Scien ...
- Articles in the publication
-
The ISME journal
- By the university
-
University of Gothenburg
-
Stockholm University