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Ectotherms regulate body temperature through external sources, while poikilotherms have variable body temperatures dependent on environmental conditions.
Poikilothermy vs. Ectothermy — What's the Difference? By Fiza Rafique & Maham Liaqat — Updated on April 24, 2024. Poikilothermy refers to animals whose body temperature varies with the environment, whereas ectothermy involves deriving body heat from external sources.
ectotherm: An animal that relies on external environment to regulate its internal body temperature. endotherm : An animal that regulates its own internal body temperature through metabolic processes. homeotherm : An animal that maintains a constant internal body temperature, usually within a narrow range of temperatures.
Figure 32.11.1 below shows the energy output vs temperature for a homeotherm (mouse) and poikilotherm (lizard). Figure \ (\ PageIndex {1}\): Homeotherm vs. Poikilotherm: Sustained energy output of an endothermic animal (mammal) and an ectothermic animal (reptile) as a function of core temperature.
A poikilotherm (/ ˈ p ɔɪ k ə l ə ˌ θ ɜːr m, p ɔɪ ˈ k ɪ l ə ˌ θ ɜːr m /) is an animal (Greek poikilos – 'various, spotted', and therme – 'heat) whose internal temperature varies considerably.
Compare ectothermic vs endothermic (cold blooded vs warm blooded) animals. Get examples of each type, exceptions, and their pros and cons.
A thermoconforming ectotherm is also known as a poikilotherm. Consider most fish for example. Water has the ability to sap heat out of an organism very quickly. As fish breathe, water passes directly over their gills and cools their blood. As a consequence, most fish are the same temperature as water around them.
In biology terms the difference between ectotherm and poikilothermy is that ectotherm is a cold-blooded animal which regulates its body temperature by exchanging heat with its surroundings while poikilothermy is the quality of having a body temperature that varies or fluctuates, depending on the temperature of the environment; cold-bloodedness.
An ectotherm (from the Greek ἐκτός (ektós) "outside" and θερμός (thermós) "heat"), more commonly referred to as a "cold-blooded animal", [1] is an animal in which internal physiological sources of heat, such as blood, are of relatively small or of quite negligible importance in controlling body temperature. [2]
Figure 1. Comparison of body temperature response by ectotherm (i.e., poikilotherm) and endotherm (i.e., homeotherm) to changing ambient temperatures. Poikilotherms are also known as ectotherms...