Abstract
Impedance techniques allow simultaneous recording of heart rates and both scaphognathite rates of lightly restrained crabs. Considerable interspecific and intraspecific variability of rates were observed at all but low oxygen levels for Carcinus maenas, Macropipus holsatus and M. depurator. Carcinus was observed to show significantly lower mean heart rates than animals of the same size from the Macropipus species. Heart rates revealed highly significant relationships between log heart rate and log O 2 saturation. Scaphognathite rates did not show a linear response to oxygen deprivation but increased to maximum values, with small interspecific differences, between 30 to 40% saturation before dropping to minimum values at low oxygen levels. Carcinus became more active at intermediate oxygen saturations whereas the Macropipus species became immobile as the oxygen levels dropped.
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