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Título

Differences in ammonium oxidizer abundance and N uptake capacity between epilithic and epipsammic biofilms in an urban stream

AutorBernal, Susana ; Segarra, Anna; Merbt, S. ; Martí, Eugènia
Palabras claveAmmonia oxidizing bacteria and archaea
Waste water treatment plant input
Stream biofilms
Uptake kinetics
Nitrogen saturation
Ammonium uptake
Ammonium oxidation
Fecha de publicación2018
EditorSociety for Freshwater Science
CitaciónFreshwater Science 37(1):13-22 (2018)
ResumenThe capacity of stream biofilms to transform and assimilate N in highly N-loaded streams is essential to guarantee the water quality of freshwater resources in urbanized areas. However, the degree of N saturation experienced by urban streams and their response to acute increases in N concentration are largely unknown. We measured changes in the rates of NH4 1 uptake (UNH4) and oxidation (UAO) resulting from experimental increases in NH4 1-N concentration in mature biofilms growing downstream of a wastewater treatment plant (WWTP) and, thus, naturally exposed to high N concentration. We investigated the responses of UNH4 and UAO to NH4 1-N increases and the abundance of NH4 1 oxidizing bacteria and archaea (AOB and AOA) in epilithic and epipsammic biofilms. UNH4 and UAO increased with increasing NH4 1-N concentration for the 2 biofilm types, suggesting no N saturation under ambient levels of NH4 1-N. Thus, these biofilms can contribute to mitigating N excesses and the variability of NH4 1-N concentrations from WWTP effluent inputs. The 2 biofilm types exhibited different Michaelis–Menten kinetics, indicating different capacity to respond to acute increases in NH4 1-N concentration. Mean UNH4 and UAO were 5 higher in epilithic than epipsammic biofilms, coinciding with a higher abundance of AOA1AOB in the former than in the later (76 104 vs 14 104 copies/cm2). AOB derived from active sludge dominated in epilithic biofilms, so our results suggest that WWTP effluents can strongly influence in-stream NH4 1 processing rates by increasing N inputs and by supplying AOA1AOB that are able to colonize some stream habitats.
DescripciónEste artículo contiene 10 páginas, 3 figuras, 3 tablas.
Versión del editorhttp://dx.doi.org/10.1086/696267
URIhttp://hdl.handle.net/10261/160867
ISSN2161-9549
E-ISSN2161-9565
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