Skip navigation
SuUB logo
DSpace logo

  • Home
  • Institutions
    • University of Bremen
    • City University of Applied Sciences
    • Bremerhaven University of Applied Sciences
  • Sign on to:
    • My Media
    • Receive email
      updates
    • Edit Account details

Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-00103941-12
00103941-1.pdf
OpenAccess
 
copyright

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


File Description SizeFormat
00103941-1.pdf6.63 MBAdobe PDFView/Open
Other Titles: Auswirkungen und Bedeutung von Ammoniak- und Nitrit Oxidation im Marinen Stickstoffkreislauf
Authors: Fuessel, Jessika 
Supervisor: Kuypers, Marcel
1. Expert: Kuypers, Marcel
2. Expert: Daims, Holger 
Abstract: 
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.
Keywords: Nitrogen cycle, oxygen minimum zones, nitrite oxidation, Nitrococcus, ammonia oxidation
Issue Date: 27-Mar-2014
Type: Dissertation
URN: urn:nbn:de:gbv:46-00103941-12
Institution: Universität Bremen 
Faculty: FB5 Geowissenschaften 
Appears in Collections:Dissertationen

  

Page view(s)

22
checked on Jan 25, 2021

Download(s)

2
checked on Jan 25, 2021

Google ScholarTM

Check


Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.

Legal notice -Feedback -Data privacy
Media - Extension maintained and optimized by Logo 4SCIENCE