Fig 2. Dietary effect on the average egg-lay rates of four Drosophila species.

A) Average number of eggs laid in the first ten days per female of D. mel. on three dietary treatments: no yeast, minimum yeast (1 scoop/fly/day), and ad libitum yeast. B) identical to A but using D. gut. C) D. def. D) D. tri. ***: p<0.001.