Unidirectional response to bidirectional selection on body size II. Quantitative genetics.

Autor: Le Rouzic A; Laboratoire Évolution, Génomes, Comportement, Écologie CNRS, IRD, Université Paris-Saclay Gif-sur-Yvette France., Renneville C; Institut d'Écologie et des Sciences de l'Environnement de Paris (iEES-Paris) Sorbonne Université, Université Paris Diderot, UPEC, CNRS, INRAE, IRD Paris France., Millot A; Centre de Recherche en Écologie Expérimentale et Prédictive (CEREEP-Ecotron Ile-de-France), UMS 3194 École normale supérieure, PSL Research University, CNRS Saint-Pierre-lès-Nemours France., Agostini S; Centre de Recherche en Écologie Expérimentale et Prédictive (CEREEP-Ecotron Ile-de-France), UMS 3194 École normale supérieure, PSL Research University, CNRS Saint-Pierre-lès-Nemours France., Carmignac D; Institut d'Écologie et des Sciences de l'Environnement de Paris (iEES-Paris) Sorbonne Université, Université Paris Diderot, UPEC, CNRS, INRAE, IRD Paris France., Édeline É; Institut d'Écologie et des Sciences de l'Environnement de Paris (iEES-Paris) Sorbonne Université, Université Paris Diderot, UPEC, CNRS, INRAE, IRD Paris France.; ESE Ecology and Ecosystem Health INRAE Agrocampus Ouest Rennes France.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2020 Oct 01; Vol. 10 (20), pp. 11453-11466. Date of Electronic Publication: 2020 Oct 01 (Print Publication: 2020).
DOI: 10.1002/ece3.6783
Abstrakt: Anticipating the genetic and phenotypic changes induced by natural or artificial selection requires reliable estimates of trait evolvabilities (genetic variances and covariances). However, whether or not multivariate quantitative genetics models are able to predict precisely the evolution of traits of interest, especially fitness-related, life history traits, remains an open empirical question. Here, we assessed to what extent the response to bivariate artificial selection on both body size and maturity in the medaka Oryzias latipes , a model fish species, fits the theoretical predictions. Three lines (Large, Small, and Control lines) were differentially selected for body length at 75 days of age, conditional on maturity. As maturity and body size were phenotypically correlated, this selection procedure generated a bi-dimensional selection pattern on two life history traits. After removal of nonheritable trends and noise with a random effect ("animal") model, the observed selection response did not match the expected bidirectional response. For body size, Large and Control lines responded along selection gradients (larger body size and stasis, respectively), but, surprisingly, the Small did not evolve a smaller body length and remained identical to the Control line throughout the experiment. The magnitude of the empirical response was smaller than the theoretical prediction in both selected directions. For maturity, the response was opposite to the expectation (the Large line evolved late maturity compared to the Control line, while the Small line evolved early maturity, while the opposite pattern was predicted due to the strong positive genetic correlation between both traits). The mismatch between predicted and observed response was substantial and could not be explained by usual sources of uncertainties (including sampling effects, genetic drift, and error in G matrix estimates).
Competing Interests: The authors declare no competing financial and/or nonfinancial interests.
(© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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