. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THALASSINID RESPIRATORY ADAPTATIONS 277 ing the end of the sampling tube with cheesecloth. Syringes were sealed with toothpicks, placed on ice and taken directly to the laboratory for analysis. Water samples from burrows of Callianassa were not obtainable because the burrows were collapsible and relatively impermanent. Only interstitial water samples were taken. An interstitial water sampler was constructed of hard, clear, plastic tubing (93 cm long X cm diameter) with small holes drilled around the circumference for a d
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THALASSINID RESPIRATORY ADAPTATIONS 277 ing the end of the sampling tube with cheesecloth. Syringes were sealed with toothpicks, placed on ice and taken directly to the laboratory for analysis. Water samples from burrows of Callianassa were not obtainable because the burrows were collapsible and relatively impermanent. Only interstitial water samples were taken. An interstitial water sampler was constructed of hard, clear, plastic tubing (93 cm long X cm diameter) with small holes drilled around the circumference for a distance of 15 cm from the bottom. A solid pointed end enabled the sampler to penetrate 30-60 cm into the substrate. A 10-ml sample of interstitial water was collected and then treated as described above for burrow samples. Sufficient interstitial water samples were not obtainable from the habi- tats of Upogebia because of the exceptionally fine substrate. — 3CH to O X I 3 3 E X O £ •£ o i— QL 5 to O O O X O 24-. 20 40 60 80 100 OXYGEN TENSION, mmHg 120 140 160 FIGURE 1. Oxygen consumption of Callianassa calif orniensis as a function of oxygen tension at 10° C (O g; D g; • g; V g). RESULTS Metabolic rate-oxygen tension measurements The metabolic rates of four individual Callianassa calijorniensis in relation to oxygen tension are seen in Figure 1. Regulation occurs over the range of oxygen tensions from 160 to 20 mm Hg. Datum points are sufficiently different for each individual in this independent range of regulation to warrant separate curves. A distinct break in the metabolic rate curve occurs at 10-20 mm Hg. This range, the oxygen tension at which the metabolic rate ceases to be independent, is called the critical oxygen tension, or Tc (Prosser, 1955). Thus at a Tc of 10-20 mm Hg, corresponding to ml O2/l or air-saturation, metabolism becomes directly dependent upon external oxygen Please note that these images are
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