. | β1 . | β2 . | β3 . | Range (mm) . | Res. d.f. . |
---|---|---|---|---|---|
Eye length | 0.844*** | 0.055*** | 0.063*** | 1.35–2.25 | 145 |
Eye width | 0.632*** | 0.030*** | 0.068*** | 0.86–1.4 | 145 |
Stalk length | –0.378*** | 0.343*** | 0.270*** | 3.0–8.64 | 134 |
Eye separation | 2.395*** | 0.166*** | 0 (P=0.16) | 3.85–8.0 | 50 |
. | β1 . | β2 . | β3 . | Range (mm) . | Res. d.f. . |
---|---|---|---|---|---|
Eye length | 0.844*** | 0.055*** | 0.063*** | 1.35–2.25 | 145 |
Eye width | 0.632*** | 0.030*** | 0.068*** | 0.86–1.4 | 145 |
Stalk length | –0.378*** | 0.343*** | 0.270*** | 3.0–8.64 | 134 |
Eye separation | 2.395*** | 0.166*** | 0 (P=0.16) | 3.85–8.0 | 50 |
Frontal macro-photographs were taken of 74 crabs between 10 and 25 mm carapace width (cw) and anatomical parameters of both eyes were measured where possible. A linear mixed model was applied with crab and set-up as random effects. All parameters except eye separation are significantly larger in males. Regression lines are given byβ 1+β2×cw+β3×sex,where sex is 0 for females and 1 for males. ***P<0.001