Sex ratio of current-year (A and B) and 1-year-old (C and D) <i>Gonioctena quinquepunctata</i> beetles on <i>Prunus padus</i> (Pp) and <i>Prunus serotina</i> (Ps) shrubs growing in full light or shade (B and D). Numbers 1–6 and 1–8 indicate successive dates of insect collection (see Materials and Methods).

One-way ANOVA was used to determine the effect of term (length of the sampling period) on the sex ratio of beetles on Ps (current-year, R2 = 0.2477, P = 0.1111; 1-year-old, R2 = 0.7098, P < 0.0001), on Pp (current-year, R2 = 0.1884, P = 0.2551; 1-year-old, R2 = 0.7661, P < 0.0001), on sunlit shrubs (current-year, R2 = 0.1286, P = 0.5031; 1-year-old, R2 = 0.8441, P < 0.0001) and shaded shrubs (current-year, R2 = 0.4109, P = 0.0053; 1-year-old, R2 = 0.8590, P < 0.0001).