Fig. 4. (A) Mean surface interval and (B) dive durations ± S.E.M. in control and pharmacologically blocked harbour seals (N=5). Note that the time scales for each graph are different. , seals treated with -adrenergic blocker; ß, seals treated with ß-adrenergic blocker; mu+, seals treated with muscarinic and -adrenergic blockers combined; mu+ß, seals treated with muscarinic and ß-adrenergic blockers combined.

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