Summary
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1.
The function of ventilatory pauses in the crab,Cancer pagurus, was investigated by analyzing pre- and postbranchial hemolymph, sampled via chronic indwelling catheters before, during and after pauses.
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2.
Evidence is presented that aerobic metabolism declines when ventilation ceases and that hemolymph O2 stores are nearly depleted during a typical pause.
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3.
At 10° C and 34‰ salinity, hemocyanin has a low O2 affinity (P 50=9 Torr at pH 7.96) and a large, normal Bohr shift (ΔlogP 50/ΔpH=−0.95). The cooperativity between O2 binding sites is high (n 50=3.5).
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4.
It is suggested that pausing behavior serves to optimize the expenditure of energy during periods of non-activity by calling on O2 stores built up during ventilating periods.Cancer pagurus accomplishes this by nearly completely saturating its low O2 carrying capacity hemolymph with O2. Having a large hemolymph volume and highP O 2 in the venous hemolymph pool are obvious advantages.
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Burnett, L.E., Bridges, C.R. The physiological properties and function of ventilatory pauses in the crabCancer pagurus . J Comp Physiol B 145, 81–88 (1981). https://doi.org/10.1007/BF00782597
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DOI: https://doi.org/10.1007/BF00782597