Assessment of variations in dissolved organic matter in contrasting streams in the Pampas and Patagonian regions (Argentina)
R. D. García A , M. L. Messetta B , C. Feijoó B and P. E. García A CA Grupo de Ecología de Sistemas Acuáticos a escala de Paisaje, Instituto de Investigaciones en Biodiversidad y Medioambiente, Universidad Nacional del Comahue, CONICET, Quintral 1250, CP8400 San Carlos de Bariloche, Río Negro, Argentina.
B Programa de biogeoquímica de ecosistemas dulceacuícolas, Instituto de Ecología y Desarrollo Sustentables, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Route 5 B6702, CP6700 Luján, Argentina.
C Corresponding author. Email: garcia.patriciaelizabeth@gmail.com
Marine and Freshwater Research 70(5) 698-707 https://doi.org/10.1071/MF18156
Submitted: 11 April 2018 Accepted: 26 September 2018 Published: 14 December 2018
Abstract
Dissolved organic matter (DOM) is the major source of carbon in aquatic environments and may be derived from allochthonous or autochthonous sources. This study presents the first DOM characterisation in streams from two contrasting Argentinean regions (the Pampas and Patagonia). We found that dissolved organic carbon (DOC) concentrations and absorption coefficients at 254 and 350 nm (a254 and a350) were higher in Pampean than in Patagonian streams. DOM from streams in both regions contained compounds with high molecular weight and highly variable a350 per DOC; it has been suggested that this could be an indicator of lignin content. The characterisation of DOM reflects the agricultural signal and the effect of autochthonous sources in Pampean streams, whereas a more pristine condition with high input from terrestrial environments was recorded in Patagonian streams. No sign of DOM photodegradation was observed in either region. Fluorescence-based indices suggest a more recent input of DOM in Pampean streams, whereas a highly humified component was recorded in Patagonian streams. The combined use of absorbance and fluorescence-based techniques was useful for understanding the quantity and quality of DOM in these contrasting regions in Argentina.
Additional keywords: allochthonous dissolved organic matter, autochthonous dissolved organic matter, dissolved organic carbon concentration, multivariate analysis.
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