Patterns of dissolved organic matter across the Patagonian landscape: a broad-scale survey of Chilean and Argentine lakes

ZAGARESE, HORACIO E.; FERRARO, MARCELA; QUEIMALIÑOS, CLAUDIA; DIÉGUEZ, MARÍA DEL CARMEN; SUAREZ, DIEGO AÑON; LLAMES, MARÍA EUGENIA

MARINE AND FRESHWATER RESEARCH

CSIRO PUBLISHING

Año: 2017

1323-1650

Dissolved organic matter (DOM) is a complex mixture of carbon compounds from autochthonous and allochthonous sources. Dissolved organic carbon (DOC) concentrations and optical metrics of DOM provide clues as to the sources and processes affecting the DOM pool. Herein we provide the first broad-scale characterisation of DOM from Patagonian lakes across a strong west?east precipitation gradient. Fifty-eight lakes from Northern Patagonia (Argentina and Chile) plus six lakes from the Antarctic Peninsula were sampled during summer 2000?01. Six DOM metrics were evaluated: DOC absorbance at 254 nm (a254) and 350 nm (a350), DOC-specific absorbance at 254 nm (a254/DOC) and 350 nm (a350/DOC) and spectral slope between 275 and 295 nm (S275?295). The DOM of Chilean maritime lakes and shallow (15 m) Andean lakes, which is consistent with their longer water retention time. Steppe lakes, mostly from endorheic basins, made up the most heterogeneous group with regard to DOM characteristics.