Fig. 3.

D. suzukii and D. biarmipes have the same oviposition preference for P:C ratios, but differ for substrate hardness. The oviposition site preference was estimated by the percentage of eggs laid in each diet. The letters (red for D. suzukii, blue italics for D. biarmipes) indicate significant differences in the proportion of eggs laid between different diets within a species, with significant differences marked by different letters, as determined by least squared means assuming no-choice value of 33% (dashed line in all panels—see Additional file 14: Table S11, Additional file 15: S12). Each treatment was replicated 25 times. Stars represent significant differences from the null hypothesis of 33%. A Females were offered a choice between three diets differing in their P:C ratios for oviposition. B Females were offered a choice between three diets differing in their hardness (agar concentration) for oviposition