Fig. 4. Changes in (A,B) phospho-L-arginine (PLA) and (C,D) L-arginine (L-Arg) levels in foot muscle tissue of Littorina saxatilis during temperature incubations. High critical temperatures (T_c II^c and T_c II^w in cold- and warm-acclimated animals, respectively) are indicated by arrows. These are the temperatures where an onset of anaerobiosis occurred as determined by significant succinate accumulation compared with the respective control level. Open symbols denote values that are significantly different from the respective controls (P<0.05). N=5-10 for each data point.

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