Daily mean stream temperatures in Central Spain

Sites are located in the Tormes River and its tributaries, the Barbellido River, the Gredos Gorge and the Aravalle River (in the Duero Basin); the Cega River and the Pirón River (the Pirón River is a tributary of the Cega River in the larger Duero Basin); the Tagus River, the Gallo River, and the Cabrillas River (all four of which are in the Tagus Basin).

At each study site, water temperatures were recorded every 2 h throughout the year using 31 Hobo Water Temperature Pro v2 (Onset) and Vemco® Minilog data loggers. Loggers were tested for malfunctions before being deployed and were placed at bottom of the streams avoiding direct solar radiation . Depth -these are shallow streams- and position in the stream section were not relevant as it was verified.