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- W622731622 abstract "During the past decade, bilateral trait asymmetry has become an increasingly popular estimator of the quality and health of individuals and populations in ecological, evolutionary and conservation studies. At the same time, the generality of asymmetry-stress and asymmetry-fitness relationships has become a major subject of skepticism, despite substantial improvements in the statistical treatment of asymmetry data. In this paper, we introduce the basic notion of bilateral asymmetry as a biological estimator of stress and highlight recent conceptual and statistical developments in the analysis of association between asymmetry and stress. Next, we evaluate the study of bilateral asymmetry from a conservation perspective, by reviewing asymmetry-stress relationships stemming from field studies on natural, free-ranging populations. Graphical and statistical analysis suggests that the selected dataset is not subject to selective reporting. Subsequent meta-analysis shows that the mode of measurement (counts vs. linear measurements) and level of analysis (population-based vs. individual-based) may cause heterogeneity in the reported association between asymmetry and stress. When correcting for these effects, asymmetry-stress relationships differ significantly between taxa and habitats. Type (environmental vs. genetic) and presumed origin (anthropogenic vs. natural) of stress, and use of repeated measurements to separate asymmetry from measurement error, do not explain residual variation. We conclude that the lack of a theoretical framework that predicts if, when, and to what extent relationships between asymmetry and stress can be expected, hinders the widespread use of FA as biomonitoring tool in conservation. We further propose two lines of research that may be particularly helpful in developing such a framework." @default.
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- W622731622 date "2001-01-01" @default.
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- W622731622 title "The use of bilateral asymmetry in ecology and conservation: Concept, developments & prospects" @default.
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