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Ch 40 - animal form and function (3 slides per page)

Bmr per kg is negatively related to body mass ie

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Unformatted text preview: y requirements are related to size, activity and environment Basal metabolic rate (BMR) = energy needed for basic functions (e.g. cell maintenance, breathing, heartbeat) (1) How do organisms use energy? • BMR per kg is negatively related to body mass – i.e. Smaller animals require more energy per kg of body weight •BMR is positively related to body mass • i,.e. The amount of energy needed for basic maintenance is proportional to size. Liters O2/hr per kg of body weight Liters O2/hr Figure 40.19 (Campbell 8th ed) Figure 40.19 (Campbell 9th ed) 46 47 Energy Budgets = Energy used for BMR, activity, growth, reproduction, & temperature regulation Proportion used for each varies among: (A) endotherms; (B) endotherms & ectotherms depending on: (1) activity level, (2) ambient temperature, (3) body size, (4) reproductive state Endotherms 60 kg (132 lb) human from temperate climate 48 Energy Conservation Torper - reduced state of activity and metabolic rate - may occur over short or long periods of time A. Daily Torper – short-term torper seen in small animals with high BMR/kg Ectotherm 4 kg (9 lb) penguin 0.025 kg (1 oz) mouse 4 kg (9 lb) indigo snake from antarctica from temperate climate from temperate climate Figure 40.20 (Campbell 9 ed) th Energy Conservation B. Long-term Torper 1. Hibernation - long term torper in response to cold and food scarcity Chilean mouse-opossum (Thylamys elegans) Daily torpor in a Chilean mouse-opossum over 3 days [Bars indicated dark hours.] Bozinovic, F, G RuÍz, A...
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