Figure 1.

Dual stable water isotope signatures (δ¹⁸O and δ²H; in ‰, VSMOW) for both the sandy plot (A) and the clayey plot (B). The stable water isotopic signature is shown for canopy lianas (xylem water; orange triangles), trees (xylem water; inverted green triangles), bulk soil water (red squares), precipitation (through-fall + bulk; cyan circles) and stream (blue circles) samples. The local meteoric water line (LMWL) of both Paracou (gray dotted line, δ²H = 6.209 δ¹⁸O + 10.176) and Cayenne (black solid line, δ²H = 6.148 δ¹⁸O + 4.951) are depicted, as well as the global meteoric water line (GMWL; black dotted line, δ²H = 8.2 δ¹⁸O + 11.3; Rozanski et al. 1993). Vertical and horizontal boxplots display the δ²H and δ¹⁸O signatures (in ‰, VSMOW), respectively, for canopy liana xylem water (L, orange), tree xylem water (T, green) and bulk soil water (S, red). Boxplots show Q25 − 1.5 IQR, Q25, Q50, Q75 and Q75 + 1.5 IQR values. Outliers are shown by open circles. Statistical differences are indicated by different letters (non-parametric Kruskal–Wallis test with Dunn post hoc analyses, P < 0.05).