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First published online December 15, 2004
Journal of Experimental Biology 208, 83-91 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01309

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Does feeding limit cardiovascular modulation in the Dungeness crab Cancer magister during hypoxia?

Iain J. McGaw

Department of Biological Sciences, UNLV, 4505 Maryland Parkway, Las Vegas, NV 89154-4004, USA and Bamfield Marine Sciences Centre, Bamfield, British Columbia, Canada VOR 1BO

View larger version (21K): [in a new window]   Fig. 1. Changes in cardiac and ventilatory parameters (means ± S.E.M.) of eight Cancer magister during a 3 h control period in normoxia, food was then administered and changes followed for a further 12 h in normoxia. (A) Heart rate (beats min-1), (B) stroke volume (ml beat-1), (C) cardiac output (ml min-1) and (D) ventilation rates (beats min-1). In some cases standard errors were very small and do not show clearly on the figure.

View larger version (24K): [in a new window]   Fig. 2. Haemolymph flow rates (ml min-1) through the (A) anterior aorta, (B) left anterolateral artery, (C) right hepatic artery, (D) posterior aorta and (E) sternal artery of eight Cancer magister during a 3 h control period at which point food was administered and changes followed for a further 12 h. Values are means ± S.E.M.

View larger version (26K): [in a new window]   Fig. 3. (A) Heart rate (beats min-1), (B) stroke volume (ml beat-1) (C) cardiac output (ml min-1) and (D) ventilation rates (beats min-1) of eight Cancer magister. Crabs were monitored during a 3 h control period in normoxia, food was administered and cardiac parameters followed for a further 1 h in normoxia after which, hypoxic conditions of 3.2 kPa were initiated for 6 h. Normoxic conditions were then restored for an additional 6 h. Values are means ± S.E.M.

View larger version (26K): [in a new window]   Fig. 4. Haemolymph flow rates (ml min-1) through the (A) anterior aorta (B) left anterolateral artery (C) right hepatic artery (D) posterior aorta and (E) sternal artery of eight Cancer magister. Crabs were monitored during a 3 h control period in normoxia, food was administered and cardiac parameters followed for a further 1 h in normoxia after which, hypoxic conditions of 3.2 kPa were initiated for 6 h. Normoxic conditions were then restored for an additional 6 h. Values are means ± S.E.M. The beginning of the feeding, hypoxic and normoxic periods are marked. In some cases standard errors were very small and do not show clearly on the figure.

View larger version (27K): [in a new window]   Fig. 5. Changes in (A) heart rate (beats min-1), (B) stroke volume (ml beat-1), (C) cardiac output (ml min-1) and (D) ventilation rate of the branchial chambers (beats min-1) of eight Cancer magister. Crabs were monitored during a 3 h control period in normoxia, before hypoxic conditions of 3.2 kPa were initiated for 3 h. Crabs were then fed and monitored for a further 6 h in hypoxia after which normoxic conditions were restored for an additional 6 h. Values ARE means ± S.E.M. In some cases standard errors were very small and do not show clearly on the figure.

View larger version (26K): [in a new window]   Fig. 6. Haemolymph flow rates (ml min-1) through the (A) anterior aorta, (B) left anterolateral artery, (C) right hepatic artery, (D) posterior aorta and (E) sternal artery of eight Cancer magister. Crabs were monitored during a 3 h control period in normoxia, after which hypoxic conditions of 3.2 kPa were initiated for 3 h. Food was then administered and cardiac parameters followed for a further 6 h in hypoxic conditions. Normoxic conditions were then restored for an additional 6 h. Values means ± S.E.M.