Fig 2. Temperature of water (a) during different cycles of crops (from June 27 to July 25: catalogna, from July 26 to August 29: lettuce, from August 29 to November 7: Swiss Chard), and (b) at different sampling points inside the systems.

Different letters indicate significant differences with Kruskal-Wallis (a) and Mann-Whitney (b) tests at p < 0.05 level.