The supplemental .zip archive for this publication contains the following files. Files in the archive: Supplement 1: Excel file, raw data on survival and reproduction for inbred lines RI7 and S9. Supplement 2: Control codes for simulation of fecundity trajectories using Systat 10.2 Archived raw data are published (Klepsatel et al. 2013b), and are also deposited at Dryad: doi:10.5061/dryad.3q332.