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1. Introduction The Chilean North Patagonian lakes formerly called “Araucanian lakes” (38-41° S) characterized originally by their marked oligotrophy (Campos 1984, Soto and Zuniga, 1991, Soto, 2002). Nevertheless in the last two decades a transition from oligotrophy to mesotrophy has been reported (Woelfl et al. 2003), indeed to changes in their surrounding basins in some bays due to human intervention, specifically towns, agricultural and industrial activities with the consequent replacement of original native forest (Soto 2002). An example can be Rinihue lake that has reported a transition from oligotrophy to mesotrophy, from 1978 to 1998 (Woelfl et al., 2003), or Llanquihue lake with bays with a wide gradient of trophic status due human activities associated such as towns, agriculture or aquaculture activities (Soto 2002, De los Rios-Escalante et al, 2017a). Also, according to the literature, the main regulator of phytoplankton activity in Chilean Patagonian lakes is the mixing depth; a marked inverse correlation exists between both parameters, consequently, the northern Patagonian lakes, due their low mixing depth are more exposed to increase their chlorophyll concentration due to nutrients inputs (Soto, 2002). The literature reports the use of remote sensing techniques for limnological monitoring (Kondratyev and Filaratov, 1999), some of them are related with phytoplankton pigments monitoring specifically for avoid toxic algal blooms (Li et al. 2015, Lunetta et al. 2015,

Temporal variations on chlorophyll concentration in Riñihue lake (39° S, Patagonia, Chile) and its relation with satellite Landsat ETM+ spectral data.