Age-Dependent Constraints of Sex Allocation in a Parasitoid Wasp

Figure 1

A logistic regression line obtained for the relationship between maternal age and likelihood of fertilization failure. The points are placed midway to assure their visibility, and the horizontal placement of each point (= one oviposition event) is made with respect to the horizontal axis (= female wasp age). The points above or below the curve show data set in which test females produced female or male offspring (see JMP User’s Guide).