FISH 475 Lecture Notes - Lecture 8: Magnesium Sulfate, Homeothermy, Sodium Chloride
11 Apr 2018
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Lecture 8 - adaptations i: major challenges of life at s for homeothermic animals of terrestrial ancestry. Major challenges of life at sea for homeothermic animals of terrestrial ancestry: Global mean temperature of the ocean is ~3. 5c (~38. 3f) Heat capacity of water is ~24x that of air. Density of sea water is ~800x density of air. Ambient pressure increases by 1 atmosphere for each increase in 10m in water depth. Mean depth of the grand canyon is ~1,600m. Mean depth of the ocean is ~4,300m. The ocean is ~3. 5% dissolved salts by weight. Adaptations developed to handle diving to depth. Features of the ocean environment likely to pose difficulties for terrestrially derived, air-breathing homeotherms: High rate of light absorption by sea water, and by materials dissolved o suspended in sea water. High ambient pressure gradient with increasing depth. Lack of opportunity for respiratory gas exchange below the sea surface. Conservation of heat: handling low temperature and high thermal conductivity.
