Acclimatization is the process of an organism adjusting to chronic change in its environment, often involving temperature, moisture, food, often relating to seasonal climate changes. (In laboratory conditions, this process is controlled to one variable change only and is termed "Acclimation"). Acclimatization usually occurs in a short time, and within one organism's lifetime (compare adaptation). This may be a discrete occurrence or may instead represent part of a periodic cycle, such as a mammal shedding heavy winter fur in favor of a lighter summer coat. Where acclimatization occurs naturally, some authors have used acclimation to describe the process of an organism being forced to adjust to changes in their environment by artificial means, such as in a laboratory setting. [Schmidt-Nielsen, Knut. Animal Physiology: adaptation and environment. 4th Ed. Cambridge ; New York : Cambridge University Press, 1990.]


Many plants, such as maple trees, irises, and tomatoes, can survive freezing temperatures if the temperature gradually drops lower and lower each night over a period of days or weeks. The same drop might kill them if it occurred suddenly. This process is called "hardening" and involves several changes, such as a decrease in the water content and an increase in the sugar content of the plant, lowering the freezing point of sap.


Animals acclimate in many ways. Sheep grow very thick wool in cold, damp climates. Fish are able to adjust only gradually to changes in water temperature and quality. Tropical fish sold at pet stores are often kept in acclimation bags until this process is complete.


When humans move from a cool or temperate environment to a hot, dry desert environment or vice versa, they should spend up to seven days acclimatizing to the change in their environment. This lets the body make internal adjustments ("see homeostasis") to compensate for the change in environment conditions. If the acclimatization process is ignored, then the person is at higher risk for heat related injuries (heat stroke, heat cramp, pneumonia).

Acclimatization to high altitude continues for months or even years after initial ascent, and ultimately enables humans to survive in an environment that, without acclimatization, would kill them. Humans who migrate permanently to a higher altitude naturally acclimatize to their new environment by developing an increase in the number of red blood cells to increase the oxygen carrying capacity of the blood, in order to compensate for lower levels of oxygen in the air. [cite web | author=Kenneth Baillie and Alistair Simpson | title=Altitude oxygen calculator | url= | publisher=Apex (Altitude Physiology EXpeditions) | accessdate=2006-08-10 - Altitude physiology model]

ee also

*Altitude sickness
*Vostok Station
*Acclimatisation society


*World Book encyclopedia 1989
*US Army - Heat Acclimation Guide []


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  • Acclimatization — Ac*cli ma*ti*za tion ([a^]k kl[imac] m[.a]*t[i^]*z[=a] sh[u^]n), n. The act of acclimatizing; the process of inuring to a new climate, or the state of being so inured. Darwin. [1913 Webster] …   The Collaborative International Dictionary of English

  • acclimatization — acclimatization. См. акклиматизация. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • acclimatization — index habituation Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • acclimatization — (Amer.) n. process of adjusting to a new environment; habituation (also acclimatisation) …   English contemporary dictionary

  • acclimatization — ac·cli·ma·ti·za·tion (ə klī mə tĭ zāʹshən) n. The physiological adaptation of an animal or plant to changes in climate or environment, such as light, temperature, or altitude. * * * Any of numerous gradual, long term responses of an individual… …   Universalium

  • acclimatization — aklimatizacija statusas T sritis ekologija ir aplinkotyra apibrėžtis Viena prisitaikymo formų – iš kitų kraštų kilusių organizmų prisitaikymas gyventi ir veistis naujomis klimato ar aplinkos sąlygomis. atitikmenys: angl. acclimatization vok.… …   Ekologijos terminų aiškinamasis žodynas

  • acclimatization — aklimatizacija statusas T sritis Kūno kultūra ir sportas apibrėžtis Adaptacijos atmaina – žmogaus organizmo prisitaikymas prie neįprastų klimato sąlygų arba aplinkos. Aklimatizacija labai svarbi sportininkams, kurie treniruojasi arba varžosi… …   Sporto terminų žodynas

  • acclimatization — The adaptation of a living organism (plant, animal or micro organism) to a changed environment that subjects it to physiological stress. Acclimatization should not be confused with adaptation …   Glossary of Biotechnology

  • acclimatization — acclimatize (also acclimatise) ► VERB ▪ make or become accustomed to a new climate or new conditions. DERIVATIVES acclimatization noun. ORIGIN French acclimater, from climat climate …   English terms dictionary

  • acclimatization — noun see acclimatize …   New Collegiate Dictionary

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