marginally significantP = 0.061
concholepas to reach the upright position decreased with increment of p CO 2 levels (individuals nested within p CO 2 treatments, F 26, 52 = 11.21, P<0.001), and the differences between pCO 2 treatments were marginally significant (factor p CO 2 level, between subjects test: F 2, 26 = 3.12; P = 0.061).