Asset Details
Do you wish to reserve the book?
Anammox and denitrification in the oxygen minimum zone of the eastern South Pacific
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Anammox and denitrification in the oxygen minimum zone of the eastern South Pacific
Do you wish to request the book?
Anammox and denitrification in the oxygen minimum zone of the eastern South Pacific
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Anammox and denitrification in the oxygen minimum zone of the eastern South Pacific
2012
Overview
We quantified the removal of fixed nitrogen as N₂ production by anammox and N₂ and N₂O production by denitrification over a distance of 1900 km along the coasts of Chile and Peru, using short-term incubations with 15N-labeled substrates. The eastern South Pacific contains an oxygen minimum zone (OMZ) characterized by an anoxic, nitrate- and nitrite-rich layer of ∼ 200-m thickness below 30–90 m of oxic water. Anammox and denitrification were almost exclusively recorded when the in situ O₂ concentration was below detection, indicating that the induction of these processes is highly oxygen sensitive. Anammox was detected in 70% of the samples from anoxic depths. Denitrification was detected in fewer samples, but maximum rates were an order of magnitude higher than those of anammox. In our incubations denitrification was responsible for 72% of the total N₂ production and 77% of the total removal of fixed nitrogen including N₂O production. However, at the individual depths it could be one or the other process that was responsible for all of the nitrogen removal. Anammox activity was highest just below the oxic–anoxic interface and declined exponentially with depth, whereas no depth dependence was discerned for denitrification. Denitrification resulted in net production of N₂O in some of the samples and consumption of added 15N₂O in others. Together with the accumulation of
NO
2
−
this indicates that denitrification must be seen as a sequence of individually regulated reactions, each of which may start and stop depending on the electron donor input, while anammox is much less variable. The highly patchy distribution of denitrification contributes to explain the apparent imbalances between ammonium sources and sinks suggested by previous 15N-based studies in OMZs.
Publisher
John Wiley and Sons, Inc,American Society of Limnology and Oceanography
