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Auteur (up) Merot, C.; Le Poul, Y.; Thery, M.; Joron, M. url  doi
  Titre Refining mimicry: phenotypic variation tracks the local optimum Type Article scientifique
  Année 2016 Publication The Journal of Animal Ecology Revue Abrégée J Anim Ecol  
  Volume 85 Numéro 4 Pages 1056-1069  
  Mots-Clés Mullerian mimicry; adaptation; colour pattern; fitness peak; gene flow; geographic variation; hybridization; lepidoptera; morphometrics; perfect mimicry  
  Résumé Mullerian mimicry between chemically defended preys is a textbook example of natural selection favouring phenotypic convergence onto a shared warning signal. Studies of mimicry have concentrated on deciphering the ecological and genetic underpinnings of dramatic switches in mimicry association, producing a well-known mosaic distribution of mimicry patterns across geography. However, little is known about the accuracy of resemblance between natural comimics when the local phenotypic optimum varies. In this study, using analyses of wing shape, pattern and hue, we quantify multimodal phenotypic similarity between butterfly comimics sharing the so-called postman pattern in different localities with varying species composition. We show that subtle but consistent variation between populations of the localized species, Heliconius timareta thelxinoe, enhance resemblance to the abundant comimics which drive the mimicry in each locality. Those results suggest that rarer comimics track the changes in the phenotypic optimum caused by gradual changes in the composition of the mimicry community, providing insights into the process by which intraspecific diversity of mimetic pattern may arise. Furthermore, our results suggest a multimodal evolution of similarity, with coordinated convergence in different features of the phenotype such as wing outline, pattern and hue. Finally, multilocus genotyping allows estimating local hybridization rates between H. timareta and comimic H. melpomene in different populations, raising the hypothesis that mimicry refinement between closely related comimics may be enhanced by adaptive introgression at loci modifying the accuracy of resemblance.  
  Adresse Centre d'Ecologie Fonctionnelle et Evolutive, UMR 5175 CNRS – Universite de Montpellier – Universite Paul Valery Montpellier – EPHE, 1919 route de Mende, 34293, Montpellier 5, France  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0021-8790 ISBN Médium  
  Région Expédition Conférence  
  Notes PMID:27003742 Approuvé pas de  
  Numéro d'Appel MNHN @ hackert @ collection 1527  
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