Dust inputs and bacteria influence dissolved organic matter in clear alpine lakes

N. Mladenov (), R. Sommaruga, R. Morales-Baquero, I. Laurion, L. Camarero, M.C. Diéguez, A. Camacho, A. Delgado, O. Torres, Z. Chen, M. Felip and I. Reche
Additional contact information
N. Mladenov: Facultad de Ciencias & Instituto del Agua, Universidad de Granada
R. Sommaruga: University of Innsbruck, Institute of Ecology, Laboratory of Aquatic Photobiology and Plankton Ecology, Technikerstr. 25, 6020 Innsbruck, Austria.
R. Morales-Baquero: Facultad de Ciencias & Instituto del Agua, Universidad de Granada
I. Laurion: Institut National de la Recherche Scientifique, Centre - Eau Terre Environnement, 490, Rue de la Couronne, Québec, G1K 9A9 Canada.
L. Camarero: Centre d′Estudis Avançats de Blanes - CSIC, Accés Cala Sant Francesc 14 17300 Blanes Girona, Spain.
M.C. Diéguez: Laboratorio de Fotobiología, INIBIOMA-CONICET-UNComa Quintral 1250, 8400 Bariloche, Argentina.
A. Camacho: Edificio de Investigacion - Campus de Burjassot, University of Valencia
A. Delgado: Instituto Andaluz de Ciencias de la Tierra IACT(CSIC-UGR), Avd. de las Palmeras 4, 18100 Armilla, Granada, Spain.
O. Torres: NASA Goddard Space Flight Center
Z. Chen: Center for Atmospheric Sciences, Hampton University, 23 Tyler Street, Hampton, Virginia 23668, USA.
M. Felip: University of Barcelona, Avgd. Diagonal 645, 08028 Barcelona, Spain.
I. Reche: Facultad de Ciencias & Instituto del Agua, Universidad de Granada

Nature Communications, 2011, vol. 2, issue 1, 1-7

Abstract: Abstract Remote lakes are usually unaffected by direct human influence, yet they receive inputs of atmospheric pollutants, dust, and other aerosols, both inorganic and organic. In remote, alpine lakes, these atmospheric inputs may influence the pool of dissolved organic matter, a critical constituent for the biogeochemical functioning of aquatic ecosystems. Here, to assess this influence, we evaluate factors related to aerosol deposition, climate, catchment properties, and microbial constituents in a global dataset of 86 alpine and polar lakes. We show significant latitudinal trends in dissolved organic matter quantity and quality, and uncover new evidence that this geographic pattern is influenced by dust deposition, flux of incident ultraviolet radiation, and bacterial processing. Our results suggest that changes in land use and climate that result in increasing dust flux, ultraviolet radiation, and air temperature may act to shift the optical quality of dissolved organic matter in clear, alpine lakes.

Date: 2011
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DOI: 10.1038/ncomms1411

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