Fig. 2

Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) grouping soil variables from sites of Epidendrum fulgens, E. puniceoluteum and their hybrids. a-b Representation of the scores on the first two axes of the PCA in ICA and ICO hybrid zones, respectively, using soil variables measured in sites of Epidendrum fulgens (blue), E. puniceoluteum (orange) and their hybrids (black). Each arrow points in the direction of increase of values for the corresponding soil variable. pH = potential for hydrogen; OM = organic matter; CEC = cation exchange capacity; SB = sum of bases; BSP = base saturation percentage (BSP); ASP = aluminum saturation percentage; PA = potential acidity; P = phosphorus; K = potassium; Ca = calcium; Na = sodium; S = sulfur; Al = aluminum; Mg = magnesium. c-d Representation of the scores on the first two axes of the LDA in ICA and ICO hybrid zones, respectively, using the same soil variables