MODENUTTI Beatriz Estela
congresos y reuniones científicas
Glacial recession affecting light climate in andean patagonian lakes: implications for planktonic phototrophs.
B. MODENUTTI,; NICOLÁS MARTINIUK; BASTIDAS NAVARRO, M.,; E. BALSEIRO,
Congreso; ASLO granada 2015; 2015
Climatechange is altering temperatures and precipitation patterns all over the world. InNorth Patagonia glaciers in mountain Tronador (41 °S) showed a continuous and maintainedrecession and these meltwaters are transported to the lake Mascardi via theManso River that carries large amount of glacial clay. These suspended sedimentparticles cause a very sharp light longitudinal gradient along the westernbranch of Lake Mascardi (Brazo Tronador). Here we analyzed changes in the watertransparency along the gradient, and how glacial loading of clays influencesthe light: nutrient ratio and photosynthetic parameters (measured with a pulseamplitude modulated fluorometer) of planktonic primary producers. Light penetrationresulted directly related with the depth of the deep chlorophyll maxima sincethe increased load of suspended solids affects turbidity, which decreases theavailability of photosynthetically active radiation for primary producers.However, the increase transparency towards the end of the gradient would implya high exposure to UVR and PAR that can lead to photoinhibiton. Therefore,photosynthetic organisms are affected by a trade-off between light availabilityand photoinhibition.