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First published online November 4, 2005
Journal of Experimental Biology 208, 4333-4343 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01918
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Respiratory and acid–base responses during migration and to exercise by the terrestrial crab Discoplax (Cardisoma) hirtipes, with regard to season, humidity and behaviour

Steve Morris

Integrative and Environmental Physiology, School of Biological Sciences, University of Bristol, Woodland Road, Bristol, BS8 1UG, UK



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  		Fig. 1. The concentration of L-lactate and glucose in the haemolymph during 24 h recovery from 5 min of exercise at 90% relative humidity in the laboratory. R, significant difference between that sample group and crabs at rest (P<0.05, N=8). Time 0 is time immediately after exercise.

 


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  		Fig. 2. The pH/[HCO3–] diagram for acid–base variables measured in the arterial haemolymph of Discoplax hirtipes sampled in the field during the dry season (open square, free-ranging; open circle, 5 min exercise) and the wet, migration, season (triangles, free-ranging; inverted triangles, 5 min exercise), compared with laboratory values for resting blue crabs and those exercised for 5 min at either 40% or 90% relative humidity (filled squares). The acid–base perturbations after 5 min of exercise are indicated by the broken lines with arrowheads (without implying acid–base state at times within the 5 min exercise period). The non-bicarbonate buffer line is provided (Dela-Cruz and Morris, 1997aGo). The PCO2 isopleths were calculated according to the Henderson–Hasselbalch equation using {alpha}CO2= 0.3068 µmol l–1 Pa–1 and pKa=6.08.

 

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© The Company of Biologists Ltd 2005