Sexual antagonism in sequential hermaphrodites

Area of Science:

• Evolutionary biology
• Genetics
• Reproductive strategies

Background:

• Sexual antagonism arises from differing fitness optima for males and females sharing genes.
• Hermaphrodites present unique cases of sexual antagonism, especially sequential hermaphrodites with age structure.
• Existing models primarily address simultaneous hermaphroditism, leaving sequential systems under-theorized.

Purpose of the Study:

• To develop a formal theory for sexual antagonism in sequential hermaphrodites.
• To explore trade-offs between female and male reproductive success within a single individual.
• To investigate the influence of genetic inheritance and hermaphrodite types on sexual antagonism.

Main Methods:

• Constructing a general theoretical framework for sexual antagonism in sequential hermaphrodites.
• Analyzing sexually antagonistic and life-history trade-offs under various genetic inheritance modes (autosomal, cytoplasmic).
• Developing a two-stage, two-sex model to illustrate general patterns.

Main Results:

• The theory outlines conditions for the invasion of sexually antagonistic alleles.
• Identified factors influencing the maintenance of sexually antagonistic polymorphisms.
• The two-stage model provides specific insights into evolutionary dynamics.

Conclusions:

• Sexual antagonism is a complex evolutionary force in sequential hermaphrodites.
• Age structure and genetic factors significantly impact the evolution of sexual antagonism.
• This work provides a foundation for understanding sexual conflict in diverse reproductive systems.