. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESPIRATORY ADAPTATIONS OF ANEMONES 663 Distribution of oxyycn The oxygen content of interstitial water in \Yaquoit Bay is low. At 5 cm depth in the sand the interstitial pCX ranges from mm Hg, and at 10 cm depth it ranges from mm Hg. These values compare well with those of Brafield (1964), whose study of interstitial oxygen levels in the Scilly Isles included sites of virtually identical sediment composition. Comparable values in similar sediments have also been recorded elsew-here (Eliassen, 1956; Mangum, 19
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESPIRATORY ADAPTATIONS OF ANEMONES 663 Distribution of oxyycn The oxygen content of interstitial water in \Yaquoit Bay is low. At 5 cm depth in the sand the interstitial pCX ranges from mm Hg, and at 10 cm depth it ranges from mm Hg. These values compare well with those of Brafield (1964), whose study of interstitial oxygen levels in the Scilly Isles included sites of virtually identical sediment composition. Comparable values in similar sediments have also been recorded elsew-here (Eliassen, 1956; Mangum, 1964a; Petersen and Johansen, 1967). Water overlying the sand at the sampling site is over 9Q% air saturated. Similarly, water in the running seawater system at the Marine Biological Laboratory is virtually air saturated (Fig. 2). The oxygen content of water in artificial burrows occupied by Haloclava pro- duct a is equivalent to 128 ± 8 () mm Hg. This value does not include an incomprehensible set of measurements on one animal that did not measurably irrigate and in whose tube the pO_, varied between 46 and 60 mm Hg. The AIR 16O mmHg WATER 14O-16O mmHg. SAND O-12 mmHg - 64-68 mmHg •I 128 mmHg 1 8 FIGURE 2. Distribution of oxygen in water, sand, burrow and animals. S. E. given for all sample sizes greater than 5, otherwise range. relatively high pCX of the artificial burrow water suggests that burrow irrigation in H. producta is sufficient to maintain a high effective environmental pO2, at least during periods of tidal submersion. That these high pCX's are maintained persis- tently in artificial burrows reflects the moderately low fraction of oxygen removal from the irrigation stream relative to rates of oxygen utilization in other infaunal animals (Mangum, 1964a, 1970). The results from the single anomalous animal suggest that the absence of burrow irrigation is accompanied by a substantial de- crease in burrow oxygen concentration. Internal pCX's of H. producta and AL se
Size: 1575px × 1586px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
