Figure 4.

Fertility during the 2009 drought. Females born in low-quality ecological conditions were protected by high-quality social environments. Females born to high-ranking mothers in low-quality environments were more likely to resume cycling (A) and conceive (B) during the 2009 drought than females born to low-ranking mothers in low-quality environments. The best-fit lines from a linear regression of maternal dominance rank on the residuals of a model relating resumption of cycling or conception probability to ecological and reproductive readiness variables (N = 14) are plotted with a dashed line. The mean performance for females born during high-quality years during the drought is indicated with arrows.