Water Availability and Air Humidity Strongly Affect Photosynthesis in Biofilms on Tree Trunks: Predictions for a Climate-Changing World.

Although the number of days per year with lower precipitation (0 and < 2 mm) showed an increasing trend from 1961 to 2023 (Figure 6a ), the linear regression showed low explanatory power ( R 2 < 0.1) and no statistical significance ( p > 0.05).

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During this period, only 1 year (1963) recorded more than 200 days with RH below 60%, and a decreasing trend in the occurrence of these drier days was observed, reaching zero days in both 1980 and 1981.

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