Editing Acclimatization (section)

==Methods==
===Biochemical===
In order to maintain performance across a range of environmental conditions, there are several strategies organisms use to acclimate. In response to changes in temperature, organisms can change the biochemistry of [[cell membrane]]s making them more fluid in cold temperatures and less fluid in warm temperatures by increasing the number of [[membrane protein]]s.<ref name="Los">{{cite journal | author = Los D.A., Murata N. | year = 2004 | title = Membrane fluidity and its roles in the perception of environmental signals | journal =  Biochimica et Biophysica Acta (BBA) - Biomembranes| volume = 0666 | issue = 1–2| pages = 142–157 | doi = 10.1016/j.bbamem.2004.08.002 | pmid = 15519313 | doi-access =  }}</ref> In response to certain stressors, some organisms express so-called [[heat shock protein]]s that act as [[Chaperone (protein)|molecular chaperones]] and reduce [[Denaturation (biochemistry)|denaturation]] by guiding the [[Protein folding|folding]] and refolding of proteins. It has been shown that organisms which are acclimated to high or low temperatures display relatively high resting levels of heat shock proteins so that when they are exposed to even more extreme temperatures the proteins are readily available. Expression of heat shock proteins and regulation of membrane fluidity are just two of many biochemical methods organisms use to acclimate to novel environments.

===Morphological===
Organisms are able to change several characteristics relating to their [[morphology (biology)|morphology]] in order to maintain performance in novel environments. For example, birds often increase their organ size to increase their metabolism. This can take the form of an increase in the mass of nutritional organs or heat-producing organs, like the pectorals (with the latter being more consistent across species<ref name="LiknesSwanson2011">{{cite journal|last1=Liknes|first1=Eric T.|last2=Swanson|first2=David L.|title=Phenotypic flexibility of body composition associated with seasonal acclimatization in passerine birds|journal=Journal of Thermal Biology|volume=36|issue=6|year=2011|pages=363–370|issn=0306-4565|doi=10.1016/j.jtherbio.2011.06.010}}</ref>).<ref name="McKechnie2008">{{cite journal|last1=McKechnie|first1=Andrew E.|title=Phenotypic flexibility in basal metabolic rate and the changing view of avian physiological diversity: a review|journal=Journal of Comparative Physiology B|volume=178|issue=3|year=2008|pages=235–247|issn=0174-1578|doi=10.1007/s00360-007-0218-8|pmid=17957373|s2cid=28481792}}</ref>