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Título

Biofilm growth and nitrogen uptake responses to increases in nitrate and ammonium availability

AutorRibot, Miquel ; Von Schiller, D. ; Sabater, Francesc ; Martí, Eugènia
Palabras claveNitrogen
Biofilm
Uptake
Ammonium
Nitrate
Stream
Fecha de publicación2015
EditorSpringer
CitaciónAquatic Sciences : DOI 10.1007/s00027-015-0412-9 (2015)
ResumenNitrate (NO3 -) and ammonium (NH4 +) are the two major dissolved inorganic nitrogen (DIN) species available in streams. Human activities increase stream DIN concentrations and modify the NO3 -:NH4 + ratio. However, few studies have examined biofilm responses to enrichment of both DIN species. We examined biofilm responses to variation in ambient concentrations and enrichments in either NO3 - or NH4 +. We incubated nutrient diffusing substrata (NDS) bioassays with three treatments (DIN-free, +NO3 - and +NH4 +) in five streams. Biomass-specific uptake rates (Uspec) of NO3 - and NH4 + were then measured using in situ additions of 15N-labeled NO3 - and NH4 +. Biomass (estimated from changes in carbon content) and algal accrual rates, as well as Uspec- NO3 - of biofilms in DIN-free treatments varied among the streams in which the NDS had been incubated. Higher ambient DIN concentrations were only correlated with enhanced biofilm growth rates. Uspec-NO3 - was one order of magnitude greater and more variable than Uspec-NH4 +, however similar relative preference index (RPI) suggested that biofilms did not show a clear preference for either DIN species. Biofilm growth and DIN uptake in DIN-amended NDS (i.e., +NO3 - and +NH4 +) were consistently lower than in DIN-free NDS (i.e., control). Lower values in controls with respect to amended NDS were consistently more pronounced for algal accrual rates and Uspec-NO3 - and for the +NH4 + than for the +NO3 - treatments. In particular, enrichment with NH4 + reduced biofilm Uspec- NO3 - uptake, which has important implications for N cycling in high NH4 + streams.
Descripción13 páginas, 4 tablas, 5 figuras
Versión del editorhttp://dx.doi.org/10.1007/s00027-015-0412-9
URIhttp://hdl.handle.net/10261/121136
DOI10.1007/s00027-015-0412-9
ISSN1015-1621
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