Fig. 2. Temperature-dependence of (A) the rate of state 3 respiration (diamonds) and the difference between the rates of state 3 and state 4+ respiration (circles) and (B) the rate of state 4 respiration (triangles) and state 4+ respiration (squares) of mantle mitochondria from Mya arenaria. ABT, Arrhenius break temperature. ^* indicates values that are significantly different from values at the lower temperature; N=8-18. ^*1 for state 3 and state 3 minus state 4+: P<0.01; ^*2 for state 3: P=0.023; ^*3 for state 4 and state 4+: P<0.01. (All ANOVA, ANCOVA; Newman—Keuls test.) Values are means ± S.D.