Figure 3.

Interaction between body size (mm) and adult age (days) on testes mass (mg). Individuals were divided into three groups based on the number of days since adult eclosion: young (ages 21–24 days; N = 68), middle‐aged (ages 25–39 days; N = 68), and old (ages 40–73 days; N = 64). For the purpose of clarity in this figure, the data are pooled irrespective to diet and inbreeding status. Trend lines for each group (blue = 21–24 days, red = 25–39 days, black = 40–73) were estimated from the raw data.