Abstract

1.1. The oxygen consumption of crabs in normoxic and hypoxic (50% O2) seawater was measured directly after collection.2.2. The influences of size and lunar cycles were removed by scaling the data.3.3. Strong negative correlations between low individual levels of O2 consumption and the ability to compensate for hypoxia were apparent in Wicklow (subtidal) crabs.4.4. Compensation for hypoxia was much greater on the flood tide than on the ebb.5.5. Crabs from Roscoff (intertidal) had lower levels of compensation than those from Wicklow.6.6. Size, sex and condition had no apparent effect upon these relationships.7.7. Crabs acclimated to laboratory conditions have not shown this tidal variation in compensation for hypoxia.

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