Figure 1.

Variation in embryo development time in response to variation in (i) sperm longevity and (ii) sperm dilution. Here, mean (±s.e.) duration of embryo development is plotted against the realized fertilization rate across treatment groups. Embryo development time was significantly affected by variation in sperm longevity (solid symbols, solid line and right ordinate). Sperm dilution had a significant effect on embryo development time (unfilled symbols, broken line and left ordinate). Asterisks indicate significant differences between treatments. (Online version in colour.)