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Eutrophication and acidification: Do they induce changes in the dissolved organic matter dynamics in the coastal Mediterranean Sea?
CSIC, Spain.
CSIC, Spain.
CSIC, Spain.
CSIC, Spain.
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2016 (Engelska)Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 563, s. 179-189Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

Two mesocosms experiments were conducted in winter 2010 and summer 2011 to examine how increased pCO(2) and/or nutrient concentrations potentially perturbate dissolved organic matter dynamics in natural microbial assemblages. The fluorescence signals of protein-and humic-like compounds were used as a proxy for labile and non-labile material, respectively, while the evolution of bacterial populations, chlorophyll a (Chl a) and dissolved organic carbon (DOC) concentrations were used as a proxy for biological activity. For both seasons, the presence of elevated pCO(2) did not cause any significant change in the DOC dynamics (p-value < 0.05). The conditions that showed the greatest changes in prokaryote abundances and Chl a content were those amended with nutrients, regardless of the change in pH. The temporal evolution of fluorophores and optical indices revealed that the degree of humification of the organic molecules and their molecular weight changed significantly in the nutrient-amended treatment. The generation of protein-like compounds was paired to increases in the prokaryote abundance, being higher in the nutrient-amended tanks than in the control. Different patterns in the magnitude and direction of the generation of humic-like molecules suggested that these changes depended on initial microbial populations and the availability of extra nutrient inputs. Based on our results, it is expected that in the future projected coastal scenarios the eutrophication processes will favor the transformations of labile and recalcitrant carbon regardless of changes in pCO(2). (c) 2016 The Authors. Published by Elsevier B.V.

Ort, förlag, år, upplaga, sidor
2016. Vol. 563, s. 179-189
Nyckelord [en]
Acidification, Eutrophication, Mesocosms, DOM, Mediterranean Sea, Optical indices
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
URN: urn:nbn:se:lnu:diva-54675DOI: 10.1016/j.scitotenv.2016.04.108ISI: 000377792800021PubMedID: 27135581Scopus ID: 2-s2.0-84966349287OAI: oai:DiVA.org:lnu-54675DiVA, id: diva2:949731
Tillgänglig från: 2016-07-22 Skapad: 2016-07-21 Senast uppdaterad: 2018-11-15Bibliografiskt granskad

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Pinhassi, Jarone

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