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While extant mesotherms are relatively rare, good examples include tuna, lamnid sharks (e.g., the great white shark), the leatherback sea turtle, some species of bee, [4] naked mole rats, hyraxes, and echidnas. Historically, the same word was used by de Candolle to describe plants that require a moderate degree of heat for successful growth. [5]
Under the original Köppen climate classification, all places with an average temperature in their coldest month that is colder than 18 °C (64 °F), but warmer than −3 °C (27 °F), are said to have a mesothermal climate.
In contrast to ectotherms, endotherms rely largely, even predominantly, on heat from internal metabolic processes, and mesotherms use an intermediate strategy. As there are more than two categories of temperature control utilized by animals, the terms warm-blooded and cold-blooded have been deprecated as scientific terms.
An endotherm (from Greek ἔνδον endon "within" and θέρμη thermē "heat") is an organism that maintains its body at a metabolically favorable temperature, largely by the use of heat released by its internal bodily functions instead of relying almost purely on ambient heat.
A eurytherm is an organism, often an endotherm, that can function at a wide range of ambient temperatures. [1] To be considered a eurytherm, all stages of an organism's life cycle must be considered, including juvenile and larval stages. [2]
The extinction was selective for endotherms and mesotherms relative to poikilotherms, implying causation by a decreased food supply [103] and thus consistent with megalodon being mesothermic. [50] Megalodon may have been too large to sustain itself on the declining marine food resources. [104]
Heterothermy or heterothermia (from Greek ἕτερος heteros "other" and θέρμη thermē "heat") is a physiological term for animals that vary between self-regulating their body temperature, and allowing the surrounding environment to affect it.
The physiology of dinosaurs has historically been a controversial subject, particularly their thermoregulation.Recently, many new lines of evidence have been brought to bear on dinosaur physiology generally, including not only metabolic systems and thermoregulation, but on respiratory and cardiovascular systems as well.