Investigating the genetic architecture of conditional strategies using the environmental threshold model
Identifieur interne : 002C14 ( Main/Exploration ); précédent : 002C13; suivant : 002C15Investigating the genetic architecture of conditional strategies using the environmental threshold model
Auteurs : Bruno A. Buzatto [Australie] ; Mathieu Buoro [France] ; Wade N. Hazel [États-Unis] ; Joseph L. Tomkins [Australie]Source :
- Proceedings of the Royal Society B: Biological Sciences [ 0962-8452 ] ; 2015.
Descripteurs français
- KwdFr :
- MESH :
- anatomie et histologie : Insectes.
- génétique : Insectes.
- Animaux, Caractères sexuels, Femelle, Interaction entre gènes et environnement, Modèles génétiques, Mâle, Royaume-Uni, Variation génétique.
English descriptors
- KwdEn :
- MESH :
- anatomy & histology : Insects.
- genetics : Insects.
- Animals, Female, Gene-Environment Interaction, Genetic Variation, Male, Models, Genetic, Sex Characteristics, United Kingdom.
Abstract
The threshold expression of dichotomous phenotypes that are environmentally cued or induced comprise the vast majority of phenotypic dimorphisms in colour, morphology, behaviour and life history. Modelled as conditional strategies under the framework of evolutionary game theory, the quantitative genetic basis of these traits is a challenge to estimate. The challenge exists firstly because the phenotypic expression of the trait is dichotomous and secondly because the apparent environmental cue is separate from the biological signal pathway that induces the switch between phenotypes. It is the cryptic variation underlying the translation of cue to phenotype that we address here. With a ‘half-sib common environment’ and a ‘family-level split environment’ experiment, we examine the environmental and genetic influences that underlie male dimorphism in the earwig
Url:
DOI: 10.1098/rspb.2015.2075
PubMed: 26674955
PubMed Central: 4707757
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>The threshold expression of dichotomous phenotypes that are environmentally cued or induced comprise the vast majority of phenotypic dimorphisms in colour, morphology, behaviour and life history. Modelled as conditional strategies under the framework of evolutionary game theory, the quantitative genetic basis of these traits is a challenge to estimate. The challenge exists firstly because the phenotypic expression of the trait is dichotomous and secondly because the apparent environmental cue is separate from the biological signal pathway that induces the switch between phenotypes. It is the cryptic variation underlying the translation of cue to phenotype that we address here. With a ‘half-sib common environment’ and a ‘family-level split environment’ experiment, we examine the environmental and genetic influences that underlie male dimorphism in the earwig <italic>Forficula auricularia</italic>
. From the conceptual framework of the latent environmental threshold (LET) model, we use pedigree information to dissect the genetic architecture of the threshold expression of forceps length. We investigate for the first time the strength of the correlation between observable and cryptic ‘proximate’ cues. Furthermore, in support of the environmental threshold model, we found no evidence for a genetic correlation between cue and the threshold between phenotypes. Our results show strong correlations between observable and proximate cues and less genetic variation for thresholds than previous studies have suggested. We discuss the importance of generating better estimates of the genetic variation for thresholds when investigating the genetic architecture and heritability of threshold traits. By investigating genetic architecture by means of the LET model, our study supports several key evolutionary ideas related to conditional strategies and improves our understanding of environmentally cued decisions.</p>
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