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Adaptive Significance of Circadian Clocks

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dc.contributor.author Sharma, V K
dc.date.accessioned 2012-01-23T11:33:12Z
dc.date.available 2012-01-23T11:33:12Z
dc.date.issued 2003
dc.identifier 0742-0528 en_US
dc.identifier.citation Chronobiology International 20(6), 901-919 (2003) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/240
dc.description Restricted Access en_US
dc.description.abstract Cireadian clocks are ubiquitous and are found in organisms ranging from bacteria to mammals. This ubiquity of occurrence implies adaptive significance, but to date there has been no rigorous empirical evidence to support this. It is believed that an organism possessing circadian clocks gains fitness advantage in two ways: (i) by synchronizing its behavioral and physiological processes to cyclic environmental factors (extrinsic adaptive value); (ii) by coordinating its internal metabolic processes (intrinsic adaptive value). There is preliminary circumstantial evidence to support both. Several studies using organisms living in constant environments have shown that these organisms possess functional circadian clocks, suggesting that cireadian clocks may have some intrinsic adaptive value. Studies to assess the adaptive value of circadian clocks in periodic environments suggest that organisms may have a fitness advantage in those periodic environments, which closely match their own intrinsic periodicity. Furthermore, evidence from organisms living in the wild, selection studies, and studies. on latitudinal clines suggest that circadian clocks may have an extrinsic adaptive valueas well. In this paper, I have presented several hypotheses for the emergence of. circadian clocks and have reviewed some major empirical studies suggesting adaptive significance of circadian clocks. en_US
dc.description.uri http://dx.doi.org/10.1081/CBI-120026099 en_US
dc.language.iso en en_US
dc.publisher Marcel Dekker Inc en_US
dc.rights © 2003 Marcel Dekker Inc en_US
dc.subject circadian en_US
dc.subject evolution en_US
dc.subject selection en_US
dc.subject adaptation en_US
dc.subject fitness en_US
dc.subject biological clocks en_US
dc.subject Locomotor-Activity Rhythm en_US
dc.subject Drosophila-Melanogaster en_US
dc.subject Suprachiasmatic Nucleus en_US
dc.subject Aperiodic Environment en_US
dc.subject Eclosion Rhythm en_US
dc.subject Molecular Analysis en_US
dc.subject Latitudinal Cline en_US
dc.subject Period Responses en_US
dc.subject Ground-Squirrels en_US
dc.subject 600 Generations en_US
dc.title Adaptive Significance of Circadian Clocks en_US
dc.type Article en_US


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