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Table 2.

Mean values (±s.d.) of loading and unloading stiffness and E-modulus measured on the tube foot disc of the two species studied

Evaporation time (min)
012345
Asterias rubens       
   Number of tube feet tested 15 
   Loading stiffness (N m-117.41±17.94a 9.40±8.76a 7.41±4.92a 13.02±9.51a 11.05±11.49a 28.92±40.79a 
   Unloading stiffness (N m-129.28±47.95a 12.49±13.68a 16.32±13.86a 18.15±15.88a 13.74±8.24a 28.37±25.84a 
   E-modulus (kPa) 6.03±6.22a 3.62±3.30a 3.09±1.97a 5.95±4.35a 5.68±5.08a 8.36±10.46a 
Paracentrotus lividus       
   Number of tube feet tested 15 10 12 12 11 
   Loading stiffness (N m-127.30±24.45a 21.76±26.68a 28.08±37.07a 82.09±130.17a 176.89±240.61b 72.66±67.02a 
   Unloading stiffness (N m-132.90±34.44a 43.22±70.76a 83.41±165.69a 72.79±72.80a 58.68±82.67a 111.52±107.84a 
   E-modulus (kPa) 8.05±7.12a 7.96±8.14a 11.82±17.73a 27.62±40.81a,b 70.02±182.24b 51.04±46.09a,b 
Evaporation time (min)
012345
Asterias rubens       
   Number of tube feet tested 15 
   Loading stiffness (N m-117.41±17.94a 9.40±8.76a 7.41±4.92a 13.02±9.51a 11.05±11.49a 28.92±40.79a 
   Unloading stiffness (N m-129.28±47.95a 12.49±13.68a 16.32±13.86a 18.15±15.88a 13.74±8.24a 28.37±25.84a 
   E-modulus (kPa) 6.03±6.22a 3.62±3.30a 3.09±1.97a 5.95±4.35a 5.68±5.08a 8.36±10.46a 
Paracentrotus lividus       
   Number of tube feet tested 15 10 12 12 11 
   Loading stiffness (N m-127.30±24.45a 21.76±26.68a 28.08±37.07a 82.09±130.17a 176.89±240.61b 72.66±67.02a 
   Unloading stiffness (N m-132.90±34.44a 43.22±70.76a 83.41±165.69a 72.79±72.80a 58.68±82.67a 111.52±107.84a 
   E-modulus (kPa) 8.05±7.12a 7.96±8.14a 11.82±17.73a 27.62±40.81a,b 70.02±182.24b 51.04±46.09a,b 

Significant intraspecific differences between means are indicated by letters in superscripts; means sharing at least one letter are not significantly different (P≥0.05, Tukey test for multiple comparison).

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