The Company of Biologists

Table 4.

Variability (%) in the mechanical properties of echinoid and asteroid tube foot disc explained by the two factors considered (species and time of evaporation)

	Loading–unloading experiment					Stress–relaxation experiment
	Loading stiffness	Unloading stiffness	E-modulus	E₀	E₁	τ
Species	15.43	6.97	14.17	0.11^*	10.68	5.05^*
Time of evaporation	7.51^*	5.01^*	9.85	14.64^*	13.51^*	39.70
Species × time of evaporation	4.33^*	2.76^*	3.93^*	26.98^*	8.23^*	13.21^*
Residual	72.73	85.26	72.05	58.27	67.57	42.03

	Loading–unloading experiment					Stress–relaxation experiment
	Loading stiffness	Unloading stiffness	E-modulus	E₀	E₁	τ
Species	15.43	6.97	14.17	0.11^*	10.68	5.05^*
Time of evaporation	7.51^*	5.01^*	9.85	14.64^*	13.51^*	39.70
Species × time of evaporation	4.33^*	2.76^*	3.93^*	26.98^*	8.23^*	13.21^*
Residual	72.73	85.26	72.05	58.27	67.57	42.03

Asterisk indicates non-significant percentages (P≥0.05, two-way ANOVA).

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