Abstract
1. 1. Carcinus maenas (L.) were exposed to alternating 6-hr periods of submersion (seawater, 9–10°C) and aerial exposure (air, 13°C) for 8–10 days. 2. 2. Following transfer to non-tidal conditions cardiac and locomotor endogenous rhythms persisted for at least 7–8 days. 3. 3. When 0.05 mg l −1 mercuric sulphate was added to the non-tidal seawater system 12–30 hr after transfer of the crabs, endogenous rhythms were disrupted. 4. 4. Locomotor activity increased and mean heart rate rose from 32.1 ± 4.6 bpm prior to pollution, to 44.7 ± 8.9 bpm after pollution. 5. 5. Impedance cardiograph trace heights remained unchanged implying little, if any, change in heart stroke volume. 6. 6. Masking or ablation of endogenous rhythms persisted throughout the period of recording. 7. 7. The significance of the results is discussed with regard to the lives of crabs in situ.
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