Cross-sex genetic correlation does not extend to sexual size dimorphism in spiders.
Naturwissenschaften
; 105(1-2): 1, 2017 Dec 05.
Article
en En
| MEDLINE
| ID: mdl-29209956
ABSTRACT
Males and females are often subjected to different selection pressures for homologous traits, resulting in sex-specific optima. Because organismal attributes usually share their genetic architectures, sex-specific selection may lead to intralocus sexual conflict. Evolution of sexual dimorphism may resolve this conflict, depending on the degree of cross-sex genetic correlation (r MF) and the strength of sex-specific selection. In theory, high r MF implies that sexes largely share the genetic base for a given trait and are consequently sexually monomorphic, while low r MF indicates a sex-specific genetic base and sexual dimorphism. Here, we broadly test this hypothesis on three spider species with varying degrees of female-biased sexual size dimorphism, Larinioides sclopetarius (sexual dimorphism index, SDI = 0.85), Nuctenea umbratica (SDI = 0.60), and Zygiella x-notata (SDI = 0.46). We assess r MF via same-sex and opposite-sex heritability estimates. We find moderate body mass heritability but no obvious patterns in sex-specific heritability. Against the prediction, the degree of sexual size dimorphism is unrelated to the relative strength of same-sex versus opposite-sex heritability. Our results do not support the hypothesis that sexual size dimorphism is negatively associated with r MF. We conclude that sex-specific genetic architecture may not be necessary for the evolution of a sexually dimorphic trait.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Arañas
/
Caracteres Sexuales
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Naturwissenschaften
Año:
2017
Tipo del documento:
Article
País de afiliación:
Eslovenia