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Table 4.

Proportion of oxygen consumed by the mitochondrial protonleakain state 4+ Arenicola marina summer and winter animals at experimental temperatures 1 and 10°C

Oxygen consumed (%)
Membrane potential (mV)1°C10°C
Winter animals 147±6 Leak 9.89±2.01 (6) 11.21±0.85* (6) 
  ROS 0.61±0.16 (6) 0.40±0.08 (6) 
  Total 10.64±1.87 (8) 11.36±1.43 (11) 
Summer animals     
 161±4 Leak 6.46±1.77 (6) 13.78±1.44* (6) 
  ROS 1.04±0.25 (6) 0.75±0.13 (6) 
  Total 7.50±1.68 (6) 14.51±1.42* (6) 
Oxygen consumed (%)
Membrane potential (mV)1°C10°C
Winter animals 147±6 Leak 9.89±2.01 (6) 11.21±0.85* (6) 
  ROS 0.61±0.16 (6) 0.40±0.08 (6) 
  Total 10.64±1.87 (8) 11.36±1.43 (11) 
Summer animals     
 161±4 Leak 6.46±1.77 (6) 13.78±1.44* (6) 
  ROS 1.04±0.25 (6) 0.75±0.13 (6) 
  Total 7.50±1.68 (6) 14.51±1.42* (6) 

`Total' does not exactly correspond to the sum of the leak and H2O2 fractions, because it was calculated directly from the oxygen consumption data.

Values are means ± s.d. of 6-11 isolations.

All values differ significantly between summer and winter animals with the exception of the leak at 1°C (P<0.01); *significantly different to lower temperature value(P<0.001). ANOVA; Newman-Keuls test.

a

State 4+ O2corrected for H2O2 formation in % state 3 O2

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