BIO1022 Lecture Notes - Lecture 10: Poikilotherm, Evaporation
6 Jun 2018
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Lecture 10 (27/8): Body Temperature
Sensitivity to temperature:
● Animals may confirm or regulate
● Strategy determines survival range
Q10
● Measure of increase in rate of any profess with a 10 degrees temperature increase
● If rate doubles, Q10 = 2
● If rate triples, Q10 = 3
● May be rate of chemical reaction, diffusion, metabolism
● Major consequences of animal
● Animals can adjust to Q10
Optimal temperature range
● Thermoneutral zone
● Most energies efficient temperature
● Differs by animal groups
● Determines environmental tolerance
● Animals don't need energy to become warm or cold
● More energy expended above and below
● Lower and higher critical temperature bound range
● Metabolic rate increases to lethal limit
Processes of heat exchange
Animals exchange heat with their environment
● Conduction: direct transfer of thermal energy at rate dependant on conductivity
● Convection: transfer of thermal energy by movement of wind or air
● Radiation: indirect heat transfer between objects
● Evaporation: removal of heat by a liquidising molecules as gas
● The sum of the processes determines whether heat is leaving or coming into the lizard
● Heat will always move from high to low temperature
Ectothermic: outside source of heat
Poikilothermic: variable body temperature
Endothermic: generate their own heat inside
Homeothermic: body temperature constant
● Differences of ectotherms and endotherms is the metabolic rate
● Endotherms have high MR environmental temperature which highly determines body temp
