Fig. 3.

Mean concentrations of Ca²⁺ in the tunica interna (mmol l⁻¹ ± SEM) as measured on day 2–10 with Ca²⁺-selective microelectrodes. Greater than 80% egg viability was observed in all cases. Numbers in parentheses indicates sample size for indicated time point. Developmental stages with the same letter notation are not significantly different. Water [Ca²⁺] = 0.31 mmol l⁻¹