BIOL 1070 Lecture Notes - Lecture 19: Torpor, Reaction Rate, Thermoregulation

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Explore metabolism and body size as well as how and why some endotherms hibernate while others remain acive during winter. Biodiversity alert-polar bear endangerment depends on unit of assessment. As a whole there is litle evidence but across 13 subpopulaions there at least 4 areas where numbers are decreasing and several subpopulaions have not been assessed. Exchange w/ environment and amount of material of material exchanged are both strongly inluenced by body size and surface area. Relaive metabolic requirements go down with body size. One of the important characterisics that changes according to body size is surface area to volume raio. This is amount of surface area exposed to environment relaive to total volume of object. Smaller objects have higher surface area to volume raios than large objects. Exchange w/ environment is not eicient for large animals. To understand changes with temperature, measure metabolic rate.

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