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Mesotherm
Mesotherm (Greek, ''meso'' = intermediate; ''thermē'' = "heat") refers to an animal organism that adjusts its body to a metabolically favourable temperature using a context dependent balance of internal metabolically produced heat and external environmentally derived heat. "Mesothermy" is this mode of thermoregulation functionality in animals. Mesotherm animals are intermediate within the spectrum of biological thermal regulation, between ectotherms (colloquially "cold-blooded") and endotherms (colloquially "warm-blooded").
Historically, the same term was used by Alphonse Pyramus de Candolle to describe plants that require a moderate degree of heat for successful growth. In his scheme, a mesotherm plant grew in regions where the warmest month had a mean temperature greater than 22 °C and the coldest month had a mean temperature of at least 6 °C.
== Examples ==
A relatively small number of extant animal species are mesotherms such as tuna, lamnid sharks, and leatherback turtles.
It was hypothesized that non-avian dinosaurs may have been mesotherms given projected growth and metabolic rates. However, this theory was based on a study that underestimated the growth rates of dinosaurs by incorrectly scaling daily growth rates with annual growth rates. This is because most organisms, including dinosaurs, do not grow at a constant rate throughout the year, instead growing faster in some seasons more than others. Research suggests that dinosaurs grew as fast as mammals and were fully endothermic.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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