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dc.contributor.authorShore, Mairead
dc.contributor.authorMurphy, Sinead
dc.contributor.authorMellander, Per-Erik
dc.contributor.authorShortle, Ger
dc.contributor.authorMelland, Alice R.
dc.contributor.authorCrockford, Lucy
dc.contributor.authorO'Flaherty, Vincent
dc.contributor.authorWilliams, Lauren
dc.contributor.authorMorgan, Ger
dc.contributor.authorJordan, Phil
dc.date.accessioned2019-08-29T14:25:33Z
dc.date.available2019-08-29T14:25:33Z
dc.date.issued2017-03-09
dc.identifier.citationShore, Mairead, Murphy, Sinead, Mellander, Per-Erik, Shortle, Ger, Melland, Alice R., Crockford, Lucy, O'Flaherty, Vincent, Williams, Lauren, Morgan, Ger, Jordan, Phil. (2017). Influence of stormflow and baseflow phosphorus pressures on stream ecology in agricultural catchments. Science of The Total Environment, 590-591, 469-483. doi: https://doi.org/10.1016/j.scitotenv.2017.02.100en_IE
dc.identifier.issn1879-1026
dc.identifier.urihttp://hdl.handle.net/10379/15363
dc.description.abstractStormflow and baseflow phosphorus (P) concentrations and loads in rivers may exert different ecological pressures during different seasons. These pressures and subsequent impacts are important to disentangle in order to target and monitor the effectiveness of mitigation measures. This study investigated the influence of stormflow and baseflow P pressures on stream ecology in six contrasting agricultural catchments. A five-year high resolution dataset was used consisting of stream discharge, P chemistry. macroinvertebrate and diatom ecology, supported with microbial source tracking and turbidity data.Total reactive P (TRP) loads delivered during baseflows were low (1-7% of annual loads), but TRP concentrations frequently exceeded the environmental quality standard (EQS) of 0.035 mg L-1 during these flows (32-100% of the time in five catchments). A pilot microbial source tracking exercise in one catchment indicated that both human and ruminant faecal effluents were contributing to these baseflow P pressures but were diluted at higher flows. Seasonally, TRP concentrations tended to be highest during summer due to these baseflow P pressures and corresponded well with declines in diatom quality during this time (R-2 = 0.79). Diatoms tended to recover by late spring when storm P pressures were most prevalent and there was a poor relationship between antecedent TRP concentrations and diatom quality in spring (R-2 = 0.23). Seasonal variations were less apparent in the macroinvertebrate indices; however, there was a good relationship between antecedent TRP concentrations and macroinvertebrate quality during spring (R-2 = 0.51) and summer (R-2 = 0.52).Reducing summer point source discharges may be the quickest way to improve ecological river quality, particularly diatom quality in these and similar catchments. Aligning estimates of P sources with ecological impacts and identifying ecological signals which can be attributed to storm P pressures are important next steps for successful management of agricultural catchments at these scales. (C) 2017 The Authors. Published by Elsevier B.V.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherElsevieren_IE
dc.relation.ispartofScience Of The Total Environmenten
dc.subjectStormflowen_IE
dc.subjectBaseflowen_IE
dc.subjectPhosphorusen_IE
dc.subjectAgricultureen_IE
dc.subjectDiatomsen_IE
dc.subjectMacroinvertebratesen_IE
dc.subjectNUTRIENT TRANSFER CONTINUUMen_IE
dc.subject16S RIBOSOMAL-RNAen_IE
dc.subjectHEADWATER CATCHMENTSen_IE
dc.subjectDIFFUSE POLLUTIONen_IE
dc.subjectESCHERICHIA-COLIen_IE
dc.subjectWATERen_IE
dc.subjectEUTROPHICATIONen_IE
dc.subjectMANAGEMENTen_IE
dc.subjectRIVERSen_IE
dc.subjectNITROGENen_IE
dc.titleInfluence of stormflow and baseflow phosphorus pressures on stream ecology in agricultural catchmentsen_IE
dc.typeArticleen_IE
dc.date.updated2019-08-01T12:37:50Z
dc.identifier.doi10.1016/j.scitotenv.2017.02.100
dc.local.publishedsourcehttps://doi.org/10.1016/j.scitotenv.2017.02.100en_IE
dc.description.peer-reviewedpeer-reviewed
dc.internal.rssid12581496
dc.local.contactVincent O'Flaherty, Dept. Of Microbiology & Eci, Arts/Science Building, Nui Galway. 3734 Email: vincent.oflaherty@nuigalway.ie
dc.local.copyrightcheckedYes
dc.local.versionPUBLISHED
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