Salmon-derived nutrient and organic matter fluxes from a coastal catchment in southeast Alaska

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dc.contributor.authorHood, Eran W.en
dc.contributor.authorFellman, Jason B.en
dc.contributor.authorEdwards, Rick T.en
dc.contributor.authorD'Amore, David V.en
dc.contributor.authorScott, Durelle T.en
dc.contributor.departmentBiological Systems Engineeringen
dc.date.accessioned2020-02-27T16:04:49Zen
dc.date.available2020-02-27T16:04:49Zen
dc.date.issued2019-06en
dc.description.abstractSalmon are important vectors for biogeochemical transport across ecosystem boundaries. Here we quantified salmon contributions to annual catchment fluxes of nutrients (N and P) and organic matter (C, N, and P) from a forested catchment in coastal southeast Alaska. Concentrations of ammonium and soluble reactive phosphorus increased by several orders of magnitude during spawning and were significantly correlated with spawning salmon densities. Nitrate concentrations increased modestly during spawning and were not significantly correlated with salmon densities. Salmon had a modest legacy effect on inorganic N and P as evidenced by elevated streamwater concentrations past the end of the spawning period. Dissolved organic carbon concentrations did not respond to the presence of salmon; however, concentrations of dissolved organic nitrogen and phosphorus showed a significant positive relationship to salmon densities. Changes in spectroscopic properties of the bulk streamwater dissolved organic matter pool indicated that streamwater dissolved organic matter became less aromatic and biolabile during spawning. On an annual basis, salmon were the dominant source of streamwater fluxes of inorganic nutrients, accounting for 92%, 65%, and 74% of annual streamwater fluxes of ammonium, nitrate, and soluble reactive phosphorus, respectively. In contrast, fluxes of organic matter were dominated by catchment sources with salmon accounting for <1% of the annual catchment flux of dissolved organic carbon and 12% and 15% of the annual fluxes of dissolved organic nitrogen and phosphorous respectively. These findings indicate that, in small coastal catchments, salmon can be a quantitatively important source of dissolved streamwater nutrients with implications for productivity in downstream estuarine ecosystems.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesAlaska EPSCoR, Grant/Award Number: NSF award #OIA-1208927; USDA-NRI Research Program, Grant/Award Number: Award #2005-35102-16289en
dc.description.sponsorshipAlaska EPSCoR, NSF award [OIA-1208927]; USDA-NRI Research Program [2005-35102-16289]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1111/fwb.13292en
dc.identifier.eissn1365-2427en
dc.identifier.issn0046-5070en
dc.identifier.issue6en
dc.identifier.orcidScott, Durelle T. [0000-0002-5792-789X]en
dc.identifier.urihttp://hdl.handle.net/10919/97070en
dc.identifier.volume64en
dc.language.isoenen
dc.rightsCC0 1.0 Universalen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectbiogeochemistryen
dc.subjectcatchmenten
dc.subjectnutrientsen
dc.subjectorganic matteren
dc.subjectSalmonen
dc.titleSalmon-derived nutrient and organic matter fluxes from a coastal catchment in southeast Alaskaen
dc.title.serialFreshwater Biologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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