Correlational selection in the age of genomics

2021 ◽  
Author(s):  
Erik I. Svensson ◽  
Stevan J. Arnold ◽  
Reinhard Bürger ◽  
Katalin Csilléry ◽  
Jeremy Draghi ◽  
...  
Keyword(s):  
Correlational Selection

scholarly journals CORRELATIONAL SELECTION ON PRO- AND ANTI-INFLAMMATORY EFFECTORS

Evolution ◽  
2012 ◽  
Vol 66 (11) ◽  
pp. 3615-3623 ◽  
Author(s):  
Romain Guerreiro ◽  
Anne A. Besson ◽  
Jérôme Bellenger ◽  
Kévin Ragot ◽  
Gérard Lizard ◽  
...  
Keyword(s):  
Correlational Selection ◽  
Anti Inflammatory

scholarly journals Integrated phenotypes: understanding trait covariation in plants and animals

2014 ◽  
Vol 369 (1649) ◽  
pp. 20130245 ◽  
Author(s):  
W. Scott Armbruster ◽  
Christophe Pélabon ◽  
Geir H. Bolstad ◽  
Thomas F. Hansen
Keyword(s):  
Theme Issue ◽  
Approaches To Studying ◽  
Underlying Theory ◽  
Correlational Selection ◽  
Patterns And Processes ◽  
And Function ◽  
The Relationship ◽  
Theoretical Considerations

Integration and modularity refer to the patterns and processes of trait interaction and independence. Both terms have complex histories with respect to both conceptualization and quantification, resulting in a plethora of integration indices in use. We review briefly the divergent definitions, uses and measures of integration and modularity and make conceptual links to allometry. We also discuss how integration and modularity might evolve. Although integration is generally thought to be generated and maintained by correlational selection, theoretical considerations suggest the relationship is not straightforward. We caution here against uncontrolled comparisons of indices across studies. In the absence of controls for trait number, dimensionality, homology, development and function, it is difficult, or even impossible, to compare integration indices across organisms or traits. We suggest that care be invested in relating measurement to underlying theory or hypotheses, and that summative, theory-free descriptors of integration generally be avoided. The papers that follow in this Theme Issue illustrate the diversity of approaches to studying integration and modularity, highlighting strengths and pitfalls that await researchers investigating integration in plants and animals.

Pollinator-dependent evolution of floral trait combinations in an orchid herb

2020 ◽  
Vol 13 (4) ◽  
pp. 450-459
Author(s):  
Yun Wu ◽  
Xu-Yu Duan ◽  
Yong Xiang ◽  
Shao-Bin Weng ◽  
Jin-Yu Zhong ◽  
...  
Keyword(s):  
Potential Role ◽  
Flowering Phenology ◽  
Floral Display ◽  
Floral Trait ◽  
Floral Character ◽  
Evolutionary Trajectory ◽  
Start Date ◽  
Correlational Selection ◽  
Spiranthes Sinensis

Abstract Aims As one of the most important agents driving floral evolution, pollinators shape the diversity of flowers in angiosperms. However, most previous studies have only quantified pollinators driving the evolution of a single floral trait, and experimental estimates of the potential role of pollinators in shaping the evolution of floral trait associations are relatively rare. Methods We experimentally identified and estimated the pollinator-mediated directional and correlational selection on single floral traits and trait combinations across 2 years in an orchid species, Spiranthes sinensis. Important Findings Pollinators mediated directional selection for an earlier flowering start date and larger corolla size. Pollinators mediated positive correlational selection on the combinations of floral display traits and negative correlational selection on the combinations of flowering phenology and floral display traits. In addition, the strength of selection differed over time. Our results highlight the potential role of pollinators in driving the evolution of floral trait combinations and suggest that it is necessary to consider floral character functional associations when seeking to understand and predict the evolutionary trajectory of flowers in angiosperms.

Bite performance surfaces of three ecologically divergent Iguanidae lizards: relationships with lower jaw bones

2019 ◽  
Vol 127 (4) ◽  
pp. 810-825
Author(s):  
Monique Nouailhetas Simon ◽  
Renata Brandt ◽  
Tiana Kohlsdorf ◽  
Stevan J Arnold
Keyword(s):  
Biomechanical Model ◽  
Disruptive Selection ◽  
Head Shape ◽  
Linear Combinations ◽  
Mechanical Advantage ◽  
Jaw Bones ◽  
Correlational Selection ◽  
Lower Jaw ◽  
Linear Selection ◽  
Non Linear

Abstract Traits that interact to perform an ecologically relevant function are expected to be under multivariate non-linear selection. Using the lower jaw morphology as a biomechanical model, we test the hypothesis that lower jaw bones of lizards are subjected to stabilizing and correlational selection, associated with mechanical advantage and maximum bite force. We used three closely related tropidurine species that differ in size, head shape and microhabitat: Eurolophosaurus nanuzae, Tropidurus hispidus and Tropidurus semitaeniatus. We predicted a common pattern of correlational selection on bones that are part of in-levers or part of the out-lever of the lower jaw. The predicted pattern was found in E. nanuzae and T. hispidus, but this could not be shown to be statistically significant. For T. semitaeniatus, we found significant disruptive selection on a contrast involving the surangular, and also significant directional selection on linear combinations of traits in all species. The results indicate that the non-linear selection on lower jaw bones does not reflect an optimum to enhance mechanical advantage in all species. Divergent functional demands and specific ecological contexts of species seem relevant in shaping patterns of selection on morphology.

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