Fig. 5. Variation of the final stiffness of the tube foot stem of Paracentrotus
lividus with different bathing solutions. Values are means +
S.D. for 10 tube feet from one of two animals, each animal being
indicated by a different colour. Data analysed using a two-way ANOVA; means
sharing at least one letter are not significantly different
(PTukey
0.05). See text for abbreviations.