Abstract
Adult male Cancer magister crabs were subjected to a stepwise temperature change. Heart rate, cardiac output, stroke volume and hemolymph flow through four arterial systems (anterior, anterolateral, sternal and posterior) were measured using pulsed Doppler probes. Heart rate showed a positive linear relationship with temperature. The majority of acrdiac output was directed through the sternal artery, with the anterolateral arteries receiving the next largest perfusion. Temperature change resulted in an increased sternal flow. Anterolateral flow increased with a temperature increase and decreased with a temperature decrease. Results suggest that anterolateral flow may be sensitive to metabolic concerns while sternal flow may be more responsive to activity. No major hemolymph flow redirection was observed with temperature variation. Cardiac output increased initially within each experiment regardless of the direction of temperature change, while stroke volume decreased with temperature increase.
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