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http://hdl.handle.net/2445/130299
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DC Field | Value | Language |
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dc.contributor.author | Bernal Berenguer, Susana | - |
dc.contributor.author | Segarra, Anna | - |
dc.contributor.author | Merbt, Stephanie Nikola | - |
dc.contributor.author | Martí Roca, Eugènia | - |
dc.date.accessioned | 2019-03-13T18:53:01Z | - |
dc.date.available | 2019-03-13T18:53:01Z | - |
dc.date.issued | 2017-10-17 | - |
dc.identifier.issn | 2161-9549 | - |
dc.identifier.uri | http://hdl.handle.net/2445/130299 | - |
dc.description.abstract | The 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+ uptake (UNH4) and oxidation (UAO) resulting from experimental increases in NH4+-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+-N increases and the abundance of NH4+ oxidizing bacteria and archaea (AOB and AOA) in epilithic and epipsammic biofilms. UNH4 and UAO increased with increasing NH4+-N concentration for the 2 biofilm types, suggesting no N saturation under ambient levels of NH4+-N. Thus, these biofilms can contribute to mitigating N excesses and the variability of NH4+-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+-N concentration. Mean UNH4 and UAO were 5× higher in epilithic than epipsammic biofilms, coinciding with a higher abundance of AOA+AOB 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+ processing rates by increasing N inputs and by supplying AOA+AOB that are able to colonize some stream habitats | - |
dc.format.extent | 10 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | The University of Chicago Press | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1086/696267 | - |
dc.relation.ispartof | Freshwater Science, 2017, vol. 37, num. 1, p. 13-22 | - |
dc.relation.uri | https://doi.org/10.1086/696267 | - |
dc.rights | (c) The Society for Freshwater Science, 2017 | - |
dc.source | Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals) | - |
dc.subject.classification | Biofilms | - |
dc.subject.classification | Plantes | - |
dc.subject.classification | Nitrogen | - |
dc.subject.other | Biofilms | - |
dc.subject.other | Plants | - |
dc.subject.other | Nitrogen | - |
dc.title | Differences in ammonium oxidizer abundance and N uptake capacity between epilithic and epipsammic biofilms in an urban stream | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 677469 | - |
dc.date.updated | 2019-03-13T18:53:01Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals) |
Files in This Item:
File | Description | Size | Format | |
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677469.pdf | 302.15 kB | Adobe PDF | View/Open |
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