Proportion of larvae initiating metamorphosis (A). and developing post-larval shell growth (B). as a
function of larval age at metamorphosis. Metamorphosis indicated by loss of the velum. and shell growth
were scored 48 h after addition of a metamorphosis cue. The letters above the columns are Tukey’s groupings
from ANOVA. Treatments that share a letter are not significantly different from one another P>0.05..