Response of anaerobic ammonium oxidation to inorganic nitrogen fluctuations in temperate estuarine sediments

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Teixeira, C (Autor) Outra; Magalhaes, C (Autor) FCUP; Joye, SB (Autor) Outra; Adriano Bordalo (Autor) ICBAS

Revista

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Título: JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES

Vol. 121

Páginas: 1829-1839

ISSN: 2169-8953

Indexação

ISI Web of Knowledge - 19 Citações

Scopus - 24 Citações

Outras Informações

ID Authenticus: P-00K-W1R

DOI: 10.1002/2015jg003287

Abstract (EN): The discovery of anaerobic ammonium oxidation (anammox) highlighted the importance of alternative metabolic pathways to inorganic nitrogen removal in natural environments, particularly in those subjected to increased nitrate inputs, such as estuaries. Laboratory enrichment experiments were used to test the effect of increasing loads of nitrate (NO3-), nitrite (NO2-), and ammonium (NH4+) on the anammox process. Three Atlantic temperate estuaries (NW Portugal) were investigated along a salinity gradient, and anammox activity was measured under different NO3-, NO2-, and NH4+ treatments, using the isotope pairing technique. Obtained results showed that NO3- stimulated denitrification but not anammox, whereas NO2- additions had a positive effect on anammox activity, confirming its role as a key environmental control. On the other hand, increasing NH4+ concentrations seemed to inhibit anammox for low salinity sites. Our findings suggested an important role of the natural availability of nitrogen compounds in regulating anammox and the magnitude of anammox versus denitrification in estuarine environments.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11