9energetics - Chapter 9 ENERGETICS Energetic costs and...

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Unformatted text preview: Chapter 9 ENERGETICS Energetic costs and benefits of life processes Acquiring needed resources (see Fig. 9.1) How these resources are allocated Evolution of physiological adaptations to challenges imposed by existence in seawater Expressed in way resources are allocated Focus of chapter: Major patterns of energy expenditures by individuals: Basal metabolism Thermoregulation Swimming Osmoregulation Metabolic Rates Cellular mechanisms similar to other mammals. When submerged, no access to oxygen. Must ration stored oxygen during dives Lactate acid levels higher than in terrestrial mammals Whole-animal metabolic rates represent total of all the individual organs and tissues metabolic rates of an individual. Various methods used to measure MR Heart rate Oxygen respirometry Ventialtion rate Etc. Units: Consequence of method used Oxygen respirometry used oxygen volume used per unti time Heat loss measurements results in calorie units Measurements can be converted to RQ RQ = CO 2 produced/O 2 used If lipids used RQ = 0.7 If carbohydrates used RQ = 1.0 Most marine mammals range from 0.74-.77 Mixed diets MR comparisons rely on accepted...
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This note was uploaded on 10/13/2008 for the course BIOL 4865 taught by Professor X during the Spring '08 term at University of New Brunswick.

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9energetics - Chapter 9 ENERGETICS Energetic costs and...

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