Fig. 1.
(A) Hypothetical structural equation model of the causal relationships among seed origin, plant traits and fitness (seed number). U represents the unexplained variance of dependent variables. (B) Fitting of the graph (A) model to the data of this experiment. Solid and dashed arrows indicate positive and negative effects, respectively. Arrow widths are proportional to the magnitude of standardized path coefficients. Paths non-significant at P = 0·05 are denoted with the superscript ‘n.s.’. Fit statistics of the model (Pχ2, GFI and NFI) are given.