Figure 1

Sampling information. (a) The map on the top right shows the position of Sanabria Lake in the Iberian Peninsula. The satellite map (Source: Google Earth web, Imagery date: 12/07/2019, Camera: 16 km, Coordinates: 42°08′37″N 6°43′257″W) shows the study area. The sampling sites are pointed by orange triangles. Nearby villages are delimited by red coloured areas. Camping sites are pointed by yellow stars. (b) The sampling protocol. Filters of 2000 μm and 200 μm contained mainly multicellular organisms and were discarded. Sample S6 is water and S7 is sediment from an upstream tributary stream. Samples S8–S10 are water samples from a nearby small pond (Laguna de los Peces) that is not connected to the main water body. (c) CTD data collected in Sanabria Lake (sites S1–S5) during sampling.