Tracing dissolved organic matter (DOM) from land-based aquaculture systems in North Patagonian streams

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dc.contributor.authorNimptsch, Jorge
dc.contributor.authorWoelfl, Stefan
dc.contributor.authorOsorio, Sebastian
dc.contributor.authorValenzuela, Jose
dc.contributor.authorEbersbach, Paul
dc.contributor.authorvon Tumpling, Wolf
dc.contributor.authorPalma, Rodrigo
dc.contributor.authorEncina Montoya, Francisco
dc.contributor.authorFigueroa, David
dc.contributor.authorKamjunke, Norbert
dc.contributor.authorGraeber, Daniel
dc.date2015
dc.date.accessioned2021-04-30T17:05:05Z
dc.date.available2021-04-30T17:05:05Z
dc.description.abstractChile is the second largest producer of salmonids worldwide. The first step in the production of salmonids takes place in land-based aquacultures. However, the effects of the discharge from these aquacultures on stream dissolved organic matter (DOM) content, molecular composition and degradability are unknown. The aim of this study was thus to investigate the inputs of anthropogenic DOM from land-based aquaculture to the predominantly pristine river systems of North Patagonia. We hypothesized, that i) DOM exported from land-based aquaculture mainly consists of protein-like fluorescence (tyrosine and tryptophan) released from fish feces and food remains, and that ii) this DOM is highly degradable and therefore rapidly turned-over within the receiving streams. In the North Patagonian region we conducted a screening of ten land-based aquacultures and an intensive sampling campaign for one aquaculture. This was combined with longitudinal transects and a degradation experiment in order to couple the composition of DOM exported from land-based aquacultures to its degradability in streams. We measured dissolved organic carbon (DOC) concentration by high-temperature catalytic oxidation and DOM composition by fluorescence spectroscopy and parallel factor analysis. In the effluent of the ten screened aquacultures and in the repeated sampling of one aquaculture, we consistently found an increase of DOC concentrations and a dominance of protein-like fluorescence. The protein-like fluorescence rapidly disappeared downstream of the aquacultures, and in the degradation experiment. 21% of the DOC export from the repeatedly sampled aquaculture resulted from food addition and 76% from fish production. We conclude that large amounts of degradable DOM are exported from land-based aquacultures. This probably has strong effects on the ecological structure and function of North Patagonian streams, and similarly affected streams worldwide. (C) 2015 Elsevier B.V. All rights reserved.
dc.identifier.citationSCIENCE OF THE TOTAL ENVIRONMENT,Vol.537,129-138,2015
dc.identifier.doi10.1016/j.scitotenv.2015.07.160
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3948
dc.language.isoen
dc.publisherELSEVIER
dc.sourceSCIENCE OF THE TOTAL ENVIRONMENT
dc.subject.englishAquaculture
dc.subject.englishOrganic contamination
dc.subject.englishDissolved organic matter
dc.subject.englishFluorescence spectroscopy
dc.subject.englishFish farms
dc.titleTracing dissolved organic matter (DOM) from land-based aquaculture systems in North Patagonian streams
dc.typeArticle
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