Figure 4.

Predictive Clustering Tree (PCT) for multi-target regression (MTR), predicting the abundance of the core-genera, isolated from beach sand and seawater. The model predicts the highest abundances for Aspergillus and Fusarium & Bisifusarium. Particularly high abundance of Aspergillus is predicted when sea water temperature is below or equal to 9.9 °C (leftmost leaf), while high abundance of Fusarium & Bisifusarium is predicted when sea water is warmer (>9.9 °C), air pressure is high (>1012 hPa), average wind speeds are higher than 2.7 m/s and monthly rainfall rate is below or equal to 105.7 mm³ (rightmost leaf). The genus Aphanoascus is always predicted in lowest quantities.