Fig. 3.

Survivor functions estimated using Cox proportional hazards model (Proc PHREG, SAS; see Table 1) using baseline statement for large (3.2 mm) and small (2.8 mm), mated and virgin males, whose size represents the 90th and the 10th percentile of wing length, respectively. The interaction between reproductive status (mated versus virgin) and body size is illustrated by the reduced survivorship in small mated males (median survivorship of 13 versus 18 d, in small and large mated males, respectively; see long-gray arrow) as opposed to small, reverse difference in virgins (median survivorship of 17 versus 15.3 d, in small and large mated males, respectively; see short-black arrow). These survivor functions are estimated based on the second block (stratum); the other blocks reveal the same pattern (data not shown).