April 2 - April 2, 2009 Lecture Basel Metabolic Rate (for...

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April 2, 2009 Lecture Basel Metabolic Rate (for endotherms) - minimum rate of RNG used to maintain Basel function such as cell maintenance, breathing, and heart rate when animal is awake. Animal must be: Fasted Resting Non-sleeping Non-lactating Non-pregnant Metabolic rate influenced by: -level of activity -time of day -hormonal status -Oxygen availability -temp -reproductive status -time since last meal ectotherms have less BMR than endotherms per body mass marine mammals have X2 BMR compared to terrestrial animals -slope of body mass to BMR is 0.75, less than 1 -as body weight increases, metabolism of tissue per body weight decreases -gram of tissue from elephant and from mouse: mouse tissue uses more NRG per body weight -mouse eats X12 per body weight than does an elephant BMR Implications -food needs -impact on environment - interaction of other species - level of activity -how long it survives Homeostasis -endotherms- generate heat -ectotherms- get heat from surroundings - classification based on source of heat generation!!! -poikilotherm- internal temp varies widely (e.g. lizards)
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April 2 - April 2, 2009 Lecture Basel Metabolic Rate (for...

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