Figure captions
Figure 1. Female Sirex noctilio ovipositing on a Pinus patula tree in the Mpumalanga Province, South Africa. Photo credit: Jeff Garnas.
Figure 2. Covariance plot showing the relationship between variables measured at the log scale. Color intensity indicates Pearson's correlation coefficients (r) for continuous variables and R2 values from one-way ANOVAs for categorical variables. Circle width around each dot depict p-values (one circle width: P ≤ 0.05; two circle widths: P ≤ 0.01; three circle widths: P ≤ 0.001; four circle widths: P ≤ 0.0001.
Figure 3. Density of immature wasps dm-3 of xylem (a), head width (b), tunnel length (c), and resource use efficiency, or RUE (d) by sampling date, sex, immature stage, and tree position (bottom [B], middle [M], top [T]). Sampling date is listed as early, middle, and late according to when they occurred [in March, June, and September] relative to wasp development within trees. See legend for details. Error bars are SEM.
Figure 4. Proportion male (left axis) and male:female ratio (right axis) by sampling date (with early, middle, and late referring each date [March, June and September] relative to wasp development), sex, immature stage, and tree position (bottom [B], middle [M], top [T]). Error bars are SEM.