Abstract
Cardisoma guanhumi in Puerto Rico spend much of the dry season in burrows that descend to groundwater Burrows are sometimes 3-4 m deep and may be capped with dried mud for over 3 mo. Samples of gas and water from burrows at three locations in Puerto Rico were analyzed for O₂, CO₂, and ions. Osmolality and ion composition varied widely with location, from about 10% to 130% of seawater. Both gas and water Po₂'s were generally 90-120 mmHg, although some water samples were extremely hypoxic (Po₂ < 20 mmHg). Most burrows were extremely hypercapnic, with gas and water Pco₂'s up to 60 and 90 mmHg, respectively. Whether the burrow was plugged or even occupied by a crab made little difference to ion or gas concentrations. Radiotelemetry of the vertical position of crabs in their burrows indicated that they did not avoid hypercapnia and hypoxia by staying close to the entrance. Cardisoma guanhumi are thus exposed to extreme changes in Pco₂ when they descend deep in their burrows after foraging at dawn and dusk. Imp...
Published Version
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