SS – sum of squares
R2 – Procrustes coefficient of determination
CS – cophylogenetic signal (congruence between plant and lemur phylogenies)
L – lemur interactions (congruence of lemur phylogeny with differences in plant morphology)
P – plant interactions (congruence of plant phylogeny with differences in lemur morphology
*Interpretation of PSI: a p-value > 0.05 for plants means that similar lemurs tend not to interact with closely related plant species. Similarly, a p-value > 0.05 for lemurs means that similar plants tend not to interact with closely related lemurs. If p-values for both plants and lemurs are > 0.05 (as is the case of nectarivory), it means that there is no significant phylogenetic signal in species interactions.