Figure 4.

Population means for specific leaf area (SLA) (A), leaf thickness (B), mass-based photosynthetic rate (A_mass) (C), mass-based stomatal conductance (g_{s, mass}) (D), mass-based leaf nitrogen content (N_mass) (E) and 13-Carbon isotope composition (δ¹³C) (F) in the wet season (blue) and dry season (red) in relation to the index of moisture of the population (I_m). Populations that belong to the same climatic region are represented by the same symbols are; Honduras, triangles; Dry Costa Rica, diamonds; Belize, circles; Mesic Costa Rica, squares. Linear fits (R²) and significant levels (P) were obtained when the “Mesic Costa Rica” population was excluded from the analyses (see further explanation in the text). Only significant or marginally significant relationships are shown.