Difference between revisions of "Hibernation"
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==Etymology== | ==Etymology== | ||
[[Latin]] hibernatus, past participle of hibernare to pass the [[winter]], from hibernus of winter; akin to [[Latin]] hiems winter, Greek cheimōn | [[Latin]] hibernatus, past participle of hibernare to pass the [[winter]], from hibernus of winter; akin to [[Latin]] hiems winter, Greek cheimōn | ||
| − | *Date: [ | + | *Date: [https://www.wikipedia.org/wiki/19th_Century circa 1802] |
==Definitions== | ==Definitions== | ||
| − | *1 : to pass the [[winter]] in a torpid or [Rest|resting]] [[state]] | + | *1 : to pass the [[winter]] in a torpid or [[Rest|resting]] [[state]] |
*2 : to be or become inactive or dormant | *2 : to be or become inactive or dormant | ||
| + | |||
==Description== | ==Description== | ||
'''Hibernation''' is a [[state]] of inactivity and metabolic [[depression]] in [[animals]], characterized by lower [[body]] temperature, slower [[breathing]], and lower metabolic rate. Hibernating animals [[conserve]] [[food]], especially during winter when food is short, tapping [[energy]] reserves, body fat, at a slow rate. It is the animal's slowed metabolic rate which leads to a reduction in body temperature and not the other way around. | '''Hibernation''' is a [[state]] of inactivity and metabolic [[depression]] in [[animals]], characterized by lower [[body]] temperature, slower [[breathing]], and lower metabolic rate. Hibernating animals [[conserve]] [[food]], especially during winter when food is short, tapping [[energy]] reserves, body fat, at a slow rate. It is the animal's slowed metabolic rate which leads to a reduction in body temperature and not the other way around. | ||
| − | Hibernation may last several days or weeks depending on [[species]], ambient temperature, and [[time]] of year, and fur on the animal's [[body]]. The typical winter season for a hibernator is characterized by periods of hibernation interrupted by sporadic euthermic arousals wherein body temperature is restored to [[Normal|typical]] levels. There is a [[hypothesis]] that hibernators build a need for [[sleep]] during hibernation more slowly than [[normally]], and must occasionally warm up in order to eat. This has been [[supported]] by some [[evidence]] in the arctic [ | + | Hibernation may last several days or weeks depending on [[species]], ambient temperature, and [[time]] of year, and fur on the animal's [[body]]. The typical winter season for a hibernator is characterized by periods of hibernation interrupted by sporadic euthermic arousals wherein body temperature is restored to [[Normal|typical]] levels. There is a [[hypothesis]] that hibernators build a need for [[sleep]] during hibernation more slowly than [[normally]], and must occasionally warm up in order to eat. This has been [[supported]] by some [[evidence]] in the arctic [https://en.wikipedia.org/wiki/Ground_squirrel ground squirrel]. |
| − | One [[animal]] that some famously consider a hibernator is the [ | + | One [[animal]] that some famously consider a hibernator is the [https://en.wikipedia.org/wiki/Bear bear], although bears do not go into "true hibernation". During a bear's [[winter]] [[sleep]] state, the [[degree]] of metabolic depression is much less than that [[observed]] in smaller mammals. Many prefer to use the term "denning". The bear's [[body]] temperature remains relatively [[stable]] (depressed from 37 °C (99 °F) to approximately 31 °C (88 °F)) and it can be easily aroused. Some reptile [[species]] are said to brumate, or undergo [https://en.wikipedia.org/wiki/Brumation brumation], but the connection to this [[phenomenon]] with hibernation is not clear.[https://en.wikipedia.org/wiki/Hibernation] |
[[Category: Biology]] | [[Category: Biology]] | ||
Latest revision as of 23:56, 12 December 2020
Etymology
Latin hibernatus, past participle of hibernare to pass the winter, from hibernus of winter; akin to Latin hiems winter, Greek cheimōn
- Date: circa 1802
Definitions
Description
Hibernation is a state of inactivity and metabolic depression in animals, characterized by lower body temperature, slower breathing, and lower metabolic rate. Hibernating animals conserve food, especially during winter when food is short, tapping energy reserves, body fat, at a slow rate. It is the animal's slowed metabolic rate which leads to a reduction in body temperature and not the other way around.
Hibernation may last several days or weeks depending on species, ambient temperature, and time of year, and fur on the animal's body. The typical winter season for a hibernator is characterized by periods of hibernation interrupted by sporadic euthermic arousals wherein body temperature is restored to typical levels. There is a hypothesis that hibernators build a need for sleep during hibernation more slowly than normally, and must occasionally warm up in order to eat. This has been supported by some evidence in the arctic ground squirrel.
One animal that some famously consider a hibernator is the bear, although bears do not go into "true hibernation". During a bear's winter sleep state, the degree of metabolic depression is much less than that observed in smaller mammals. Many prefer to use the term "denning". The bear's body temperature remains relatively stable (depressed from 37 °C (99 °F) to approximately 31 °C (88 °F)) and it can be easily aroused. Some reptile species are said to brumate, or undergo brumation, but the connection to this phenomenon with hibernation is not clear.[1]
