Genotype-by-environment interactive effects and conflict solving during gonadal sex differentiation of pejerrey Odontesthes bonariensis, a fish with dual genotypic/environmental sex determination.

ABSTRACT:

Background

Genotypic (GSD) and environmental (ESD) sex determination coexist in many species of reptiles, fish, and amphibians. Inherited genotypic signals and environmental factors conceivably interact as pro-testis or pro-ovary signals during sex determination, but how such interactions affect gonadal sex differentiation in these species remains largely unexplained. This study uses a model gonochoristic fish with coexisting GSD and ESD, the pejerrey Odontesthes bonariensis, to examine how synergism and antagonism between sex genotype (XX/XY) and thermal (feminizing/masculinizing) regimes interactively affect environmental sensitiveness and the critical time of environmental sex determination as well as how genotype-by-environment conflicts are resolved.

Methods

We performe

SUBMITTER: Wu C 

PROVIDER: S-EPMC12532474 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature