English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/136954
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Stream drying drives microbial ammonia oxidation and first-flush nitrate export

AuthorsMerbt, S. ; Proia, Lorenzo; Prosser, James I.; Martí, Eugènia ; Casamayor, Emilio O. ; Von Schiller, D.
KeywordsSemiarid ecosystems
Stream
Ammonia oxidation
Ammonia oxidizing archaea (AOA)
Ammonia oxidizing bacteria (AOB)
Dry riverbed
Intermittent flow
Nitrification
Issue Date2016
PublisherEcological Society of America
CitationEcology 97(9) : 2192-2198 (2016)
AbstractStream microbial communities and associated processes are influenced by environmental fluctuations that may ultimately dictate nutrient export. Discharge fluctuations caused by intermittent stream flow are increasing worldwide in response to global change. We examined the impact of flow cessation and drying on in-stream nitrogen cycling. We determined archaeal (AOA) and bacterial ammonia oxidizer (AOB) abundance and ammonia oxidation activity in surface and deep sediments from different sites along the Fuirosos stream (Spain) subjected to contrasting hydrological conditions (i.e., running water, isolated pools, and dry streambeds). AOA were more abundant than AOB, with no major changes across hydrological conditions or sediment layers. However, ammonia oxidation activity and sediment nitrate content increased with the degree of stream drying, especially in surface sediments. Upscaling of our results shows that ammonia oxidation in dry streambeds can contribute considerably (~50%) to the high nitrate export typically observed in intermittent streams during first-flush events following flow reconnection. Our study illustrates how the dry channels of intermittent streams can be potential hotspots of ammonia oxidation. Consequently, shifts in the duration, spatial extent and severity of intermittent flow can play a decisive role in shaping nitrogen cycling and export along fluvial networks in response to global change.
Description7 páginas, 3 figuras
Publisher version (URL)http://dx.doi.org/10.1002/ecy.1486
URIhttp://hdl.handle.net/10261/136954
DOI10.1002/ecy.1486
ISSN0012-9658
Appears in Collections:(CEAB) Artículos
Files in This Item:
File Description SizeFormat 
Merbt_et_al-2016-Ecology.pdf373,47 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.