Table 1.

Results of ANOVA comparing growth traits of control and size-selected lines of snails Helix aspersa

Mean trait values
TraitControl lineSize-selected lineFP
Number of eggs in clutch 171.7 182.2 0.54 0.47 
Egg size (g) 0.038 0.049 62.13 0.00000001 
Hatchling size (g) 0.029 0.035 18.33 0.0001 
M0 (g) 0.041 0.065 4.41 0.04 
MA (g) 6.939 12.411 19.52 0.0001 
k (day–1) 0.059 0.058 0.001 0.97 
GRmax (g day–1) 0.101 0.181 18.37 0.0001 
AGEinflect (days) 86.90 89.17 0.59 0.45 
Mean trait values
TraitControl lineSize-selected lineFP
Number of eggs in clutch 171.7 182.2 0.54 0.47 
Egg size (g) 0.038 0.049 62.13 0.00000001 
Hatchling size (g) 0.029 0.035 18.33 0.0001 
M0 (g) 0.041 0.065 4.41 0.04 
MA (g) 6.939 12.411 19.52 0.0001 
k (day–1) 0.059 0.058 0.001 0.97 
GRmax (g day–1) 0.101 0.181 18.37 0.0001 
AGEinflect (days) 86.90 89.17 0.59 0.45 

Family-specific trait values were used as data (20 families per line). M0, MA, and k are logistic growth curve parameters: M0 is hypothetical initial body size at age equal to 0; MA is asymptotic size; kis the growth rate coefficient; GRmax measures maximum growth rate (derivative of logistic growth curve at body size equal to 0.5MA); AGEinflect is the age at which GRmax is attained. Data on metric traits were transformed with decimal logarithms prior to analysis; displayed mean values were back-transformed

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