Lecture 7 Sakai

Lecture 7 Sakai - Lecture 7 Lecture 23 23 September 2010...

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Lecture 7 Lecture 7 23 23 September September 2010 2010
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Field Metabolic Rate Isotope exchange can be used to measure metabolic rate in unrestrained, free-living animals. Doubly-labeled water: D 2 18 O or 3 H 2 18 O is used to “label” total body water. 18 O is lost as CO 2 and H 2 O D (or 3 H) is lost only as H 2 O The difference between the rate of loss of oxygen and the rate of loss of the hydrogen label is a measure of the rate of CO 2 production, which is a measure of metabolic rate.
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Basal Metabolic Rate (BMR) BMR: standardized measure of metabolic rate in endothermic homeotherms Required conditions include: Thermoneutral zone (no metabolic response to external temperature) Fasting (no SDA) Resting (no activity) Non-reproductive
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Standard Metabolic Rate (SMR) SMR: standardized measure of metabolic rate in ectotherms Required conditions include: Fasting (no SDA) Resting (no activity) Non-reproductive SMR is temperature-specific
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“Mouse to Elephant” Curve Basal metabolic rate is strongly dependent on body mass; but BMR does not vary linearly with changes in body mass. BMR is related to mass by a power function: Y=aX b
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Length of any side = L Area of any face = A A = L 2 Volume = V V = L 3 A = V 2/3 , a power function of the form Y=aX b Length of any side = 3L Area of any face = A 9L 2 Volume = V = 27L 3 A V 2/3 , a power function of the form: Y X b Introduction to Allometry
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y = x 2 R 2 = 1 0 50 100 150 200 250
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Lecture 7 Sakai - Lecture 7 Lecture 23 23 September 2010...

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