Ectotherms Rely mainly on external energy sources Endotherms Rely heavily on metabolic energy Homeotherms maintain a relatively constant internal environment Poikilotherms heterotherms ID: 637154
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Slide1
Chapter 5
TemperatureSlide2Slide3Slide4Slide5Slide6Slide7Slide8Slide9
Body Temperature Regulation
EctothermsRely mainly on external energy sources.Endotherms
- Rely heavily on metabolic energy
Homeotherms
maintain a relatively constant internal environment.
Poikilotherms
(=
heterotherms
)
Body temperature varies directly with environmental temperature.Slide10Slide11
Optimal Photosynthetic TemperaturesSlide12Slide13
Behavioral thermoregulation
Behavioral thermoregulationSlide14
Temperature Regulation by Endothermic Animals
Heat gain is mainly generated internallyMetabolism or shivering thermogenesisHeat loss is reduced by
Morphological changeFat, feather etcCountercurrent exchange Slide15
Temperature Regulation by Endothermic AnimalsThermal neutral zone
is the range of environmental temperatures over which the metabolic rate of a homeothermic animal does not change.Breadth varies among endothermic species.
Heat is mainly generated internallyMetabolism or shivering thermogenesisSlide16
Thermal Neutral ZonesSlide17Slide18Slide19Slide20Slide21
Countercurrent Heat ExchangeSlide22
Surviving Extreme TemperaturesMigration
InactivitySeek shelter during extreme periods.Reducing Metabolic RateHummingbirds enter a state of torpor when food is scarce and night temps are extreme.
Hibernation - Winter
Estivation
- SummerSlide23Slide24Slide25Slide26Slide27Slide28Slide29
The End