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Environmental stress correlates with increases in both genetic and residual variances: A meta-analysis of animal studies
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology.
Number of Authors: 2
2017 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 71, no 5, 1339-1351 p.Article in journal (Refereed) Published
Abstract [en]

Adaptive evolutionary responses are determined by the strength of selection and amount of genetic variation within traits, however, both are known to vary across environmental conditions. As selection is generally expected to be strongest under stressful conditions, understanding how the expression of genetic variation changes across stressful and benign environmental conditions is crucial for predicting the rate of adaptive change. Although theory generally predicts increased genetic variation under stress, previous syntheses of the field have found limited support for this notion. These studies have focused on heritability, which is dependent on other environmentally sensitive, but nongenetic, sources of variation. Here, we aim to complement these studies with a meta-analysis in which we examine changes in coefficient of variation (CV) in maternal, genetic, and residual variances across stressful and benign conditions. Confirming previous analyses, we did not find any clear direction in how heritability changes across stressful and benign conditions. However, when analyzing CV, we found higher genetic and residual variance under highly stressful conditions in life-history traits but not in morphological traits. Our findings are of broad significance to contemporary evolution suggesting that rapid evolutionary adaptive response may be mediated by increased evolutionary potential in stressed populations.

Place, publisher, year, edition, pages
2017. Vol. 71, no 5, 1339-1351 p.
Keyword [en]
Adaptation, genetic variation, heritability, life-history evolution, maternal effects, quantitative genetics
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-144706DOI: 10.1111/evo.13201ISI: 000401256200017PubMedID: 28186615OAI: oai:DiVA.org:su-144706DiVA: diva2:1128032
Available from: 2017-07-21 Created: 2017-07-21 Last updated: 2017-07-21Bibliographically approved

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Rowinski, Piotr K.Rogell, Björn
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CiteExportLink to record
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Citation style
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