The Oxygen Uptake of the Lobster (Homarus Vulgaris Edw.)

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Abstract
1. In sea water the oxygen uptake of Homarus vulgaris is directly proportional to the oxygen concentration. The relationship applies over the temperature range 6-18°C. 2. Within specified limits of size and condition, oxygen uptake is the same for both sexes. 3. The relative oxygen uptake in sea water decreases as the weight of the animal increases. 4. Oxygen uptake in sea water is effected mainly through the gills. The abdominal swimmerets, however, also serve in respiration and account for approximately 3 % of the total oxygen uptake. 5. In sea water of constant oxygen tension, oxygen uptake increases with increasing temperature. 6. Increase in oxygen uptake with temperature in sea water is mainly brought about by an increase in the gill ventilation rate. In addition, the degree of utilization increases. The relationship is a direct reflexion of the increased metabolic activity. 7. The ventilation rate of gills is unaffected by a decrease of oxygen. 8. The percentage of oxygen extracted by the gills increases as the oxygen concentration of the medium decreases. 9. Under the influence of carbon dioxide respiratory movements become retarded at acidities greater than about pH 7.0 and are completely inhibited at around pH 6.5. At acidities less than pH 7.0 changes in the carbon dioxide concentration are without effect on the rate of the respiratory movements. 10. The oxygen uptake in air, notwithstanding its low level, is directly proportional to temperature. 11. The significance of the above results in relation to the respiratory functions of the blood is discussed.

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