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Physiological stress and the maintenance of adaptive genetic variation in a livebearing fish

Content Provider	Springer Nature Link
Author	Culumber, Zachary W. Bautista Hernández, Christian E. Monks, Scott
Copyright Year	2013
Abstract	The importance of genetic variation in evolution is well established. Yet, the mechanisms by which genetic variation—particularly variation in traits under selection—is maintained in natural populations has long been an evolutionary puzzle. Understanding individual variables driving selection and their functional mechanisms is increasingly important in the context of global change and its potential consequences for biodiversity. Here we examined intra-population performance among allelic variants of a pleiotropic locus in response to thermal stress in the variable platyfish, Xiphophorus variatus. The wild-type tailspot allele exhibited significantly lower heat tolerance than all three pattern alleles found in the population, conforming to predictions based on previously observed correlations between temperature and pattern frequencies in the wild. Furthermore, differences between tailspot pattern frequencies in adults and juveniles were broadly consistent with this trend. Thus, it appears that physiological stress and reduced performance of the wild-type allele at higher relative temperatures is a mechanism balancing its frequency in natural populations. Temperature variation and not dissolved oxygen alone, as previously reported, is likely a important abiotic variable contributing to the maintenance of adaptive polymorphism. Furthermore, our findings underscore the potential implications of rising temperatures and physiological stress for levels of genetic variation in natural populations.
Starting Page	117
Ending Page	129
Page Count	13
File Format	PDF
ISSN	02697653
Journal	Evolutionary Ecology
Volume Number	28
Issue Number	1
e-ISSN	15738477
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-06-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pleiotropy Xiphophorus Poeciliidae Abiotic environment Evolutionary Biology Plant Sciences Human Genetics
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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