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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 stiffnessUnloading stiffnessE-modulusE0E1τ
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 stiffnessUnloading stiffnessE-modulusE0E1τ
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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