Distinct nitrogen cycling and steep chemical gradients in Trichodesmium colonies

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F20%3A00524612" target="_blank" >RIV/61388971:_____/20:00524612 - isvavai.cz</a>

Result on the web

<a href="https://www.nature.com/articles/s41396-019-0514-9" target="_blank" >https://www.nature.com/articles/s41396-019-0514-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41396-019-0514-9" target="_blank" >10.1038/s41396-019-0514-9</a>

Result language

angličtina

Original language name

Distinct nitrogen cycling and steep chemical gradients in Trichodesmium colonies

Original language description

Trichodesmium is an important dinitrogen (N-2)-fixing cyanobacterium in marine ecosystems. Recent nucleic acid analyses indicate that Trichodesmium colonies with their diverse epibionts support various nitrogen (N) transformations beyond N-2 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 N-2 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 similar to 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10606 - Microbiology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ISME Journal

ISSN

1751-7370

e-ISSN

—

Volume of the periodical

14

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

399-412

UT code for WoS article

000509197100007

EID of the result in the Scopus database

2-s2.0-85074640694