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Abstract
AbstractPeriods of simultaneous arrest in both cardiac and scaphognathite (ventilatory) pumps of up to 20 minutes duration occur spontaneously and repetitively in resting restrained Cancer productus. Measurement of cardiac and scaphognathite beat frequencies, ventilation volume, oxygen uptake and circulating blood oxygen tensions indicate that oxygen exchange is more effective in this species than has previously been reported for other brachyuran decapods and compensation for long pauses involves only short periods of moderate hyperventilation and enhanced oxygen uptake. The initiation, importance and control of pausing behaviour is discussed. During periods of repetitive pausing a stereotyped pattern of heart and scaphognathite responses occurs. The pattern is easily modified by such factors as activity and oxygen availability. This study suggests that higher neural control centers coordinate the beating of heart and scaphognathites thus allowing regulation of gas transport and exchange.
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