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An organism that depends on external sources for its body heat.


an animal whose body temperature is determined by ambient temperature, and hence any animal except birds and mammals


(ˈɛk təˌθɜrm)

a cold-blooded animal.
ec`to•ther′mic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ectotherm - an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals
animal, animate being, beast, creature, fauna, brute - a living organism characterized by voluntary movement
References in periodicals archive ?
Compensation for environmental change by complementary shifts of thermal sensitivity and thermoregulatory behaviour in an ectotherm. J Exp Biol 209: 4869-4877.
The relative importance of predation risk and water temperature in maintaining Bergmann's rule in a marine ectotherm. Am.
The role of ectotherm animals, especially lizards, in the maintenance of vectorborne pathogens is not clear.
The effects of elevated temperature on the sexual traits, immunology and survivorship of a tropical ectotherm. J.
Terrestrial systems act as a test for the role of endothermy in limiting food chain lengths, as endotherm and ectotherm consumers are often more similar in size in those systems (partially controlling for body size as a variable).
This study addresses the question: how does low tide temperature affect an ectotherm's susceptibility to predation?
Plethodontid salamanders do not conform to "general rules" for ectotherm life histories: insights from allocation models about why simple models do not make accurate predictions.
Other arboviruses infect a variety of ectotherms, including species of lizards (2-4), snakes (5-11), and turtles (12,13), but the knowledge of ectotherm involvement in the ecology of WNV is limited.
The parameters [y.sub.[c.sub.i]] and [y.sub.p] constrain the metabolic type of the consumer and predator (endotherm, vertebrate ectotherm, and invertebrate ectotherm), where the maximum value of y is 1.6 for endotherms, 3.9 for vertebrate ectotherms, and 19.4 for invertebrate ectotherms (Yodzis and Innes 1992, McCann and Yodzis 1994).