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  4. Impacts and Importance of Ammonia- and Nitrite Oxidation in the Marine Nitrogen Cycle
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-00103941-12

Impacts and Importance of Ammonia- and Nitrite Oxidation in the Marine Nitrogen Cycle

Veröffentlichungsdatum
2014-03-27
Autoren
Fuessel, Jessika  
Betreuer
Kuypers, Marcel  
Gutachter
Daims, Holger  
Zusammenfassung
Nitrification produces the most abundant form of bioavailable nitrogen in the ocean, which is also a major electron acceptor in the oxidation of organic matter. The latter role of nitrate becomes crucial in the absence of oxygen. One major aim of this thesis is to investigate the role of nitrite oxidation in oxygen minimum zone (OMZ) N-cycling. Nitrite oxidation was detected throughout the Namibian OMZ and appears unaffected even by non-detectable oxygen levels. It could recycle up to 100% of reduced nitrate and thereby potentially reduce N-loss. The high abundance of nitrite oxidizing bacteria of the genus Nitrococcus can likely be explained by their versatile metabolism. While Nitrococcus grows chemolithoautotrophically in the presence of oxygen, it gains energy via organoheterotrophic nitrate reduction to nitrite and nitrous oxide in the absence of oxygen. In the oxygenated ocean of the Mauritanian upwelling ammonia- and nitrite oxidizers appeared to be associated with marine aggregates. An alternative source of nitrite was provided by nitrate reduction, which is likely facilitated by oxygen reduced microniches within marine aggregates.
Schlagwörter
Nitrogen cycle

; 

oxygen minimum zones

; 

nitrite oxidation

; 

Nitrococcus

; 

ammonia oxidation
Institution
Universität Bremen  
Fachbereich
Fachbereich 05: Geowissenschaften (FB 05)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

00103941-1.pdf

Size

6.48 MB

Format

Adobe PDF

Checksum

(MD5):df081c7600af731ed1d1f6781cb79330

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