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Fig. 10. Mean tenacity (A) and corrected tenacity (B) (± S.D., N=30)
of the tube feet of the sea urchin Paracentrotus lividus (black bars)
and the sea star Asterias rubens (grey bars), using a separation
speed of 15 mm min-1. Significant intraspecific differences between
means for each type of substrata are indicated by letters in superscripts;
means sharing the same letter are not significantly different (P
0.05, t-test).