Evolution and genetic architecture of disassortative mating at a locus under heterozygote advantage

Type Article
Date 2021-01
Language English
Author(s) Maisonneuve LudovicORCID1, Chouteau MathieuORCID2, Joron MathieuORCID3, Llaurens ViolaineORCID1
Affiliation(s) 1 : Institut de Systematique, Evolution, Biodiversité (UMR7205), Museum National d'Histoire Naturelle CNRS, Sorbonne‐Université, EPHE, Université des Antilles, CP50, 57 rue Cuvier Paris 75005, France
2 : Laboratoire Ecologie, Evolution, Interactions Des Systèmes Amazoniens (LEEISA), USR 3456 Université De Guyane, IFREMER, CNRS Guyane, 275 route de Montabo, 97334 Cayenne, French Guiana
3 : CEFE, Univ Montpellier, CNRS, EPHE, IRD, Univ Paul Valéry Montpellier 3 Montpellier, France
Source Evolution (0014-3820) (Wiley), 2021-01 , Vol. 75 , N. 1 , P. 149-165
DOI 10.1111/evo.14129
WOS© Times Cited 11
Keyword(s) Disassortative mating, frequency dependent selection, genetic load, heliconius numata, mate preference, supergene

The evolution of mate choice is a major topic in evolutionary biology because it is thought to be a key factor in trait and species diversification. Here, we aim at uncovering the ecological conditions and genetic architecture enabling the puzzling evolution of disassortative mating based on adaptive traits. This rare form of mate choice is observed for some polymorphic traits but theoretical predictions on the emergence and persistence of this behavior are largely lacking. Thus, we developed a mathematical model to specifically understand the evolution of disassortative mating based on mimetic color pattern in the polymorphic butterfly Heliconius numata. We confirm that heterozygote advantage favors the evolution of disassortative mating and show that disassortative mating is more likely to emerge if at least one allele at the trait locus is free from any recessive deleterious mutations. We modeled different possible genetic architectures underlying mate choice behavior, such as self‐referencing alleles, or specific preference or rejection alleles. Our results showed that self‐referencing or rejection alleles linked to the color pattern locus enable the emergence of disassortative mating. However, rejection alleles allow the emergence of disassortative mating only when the color pattern and preference loci are tightly linked.

Full Text
File Pages Size Access
17 1 MB Access on demand
12 1 MB Access on demand
Author's final draft 52 2 MB Open access
Top of the page