Sexual conflict promotes speciation in insects.

Area of Science:

• Evolutionary biology
• Speciation research
• Sexual selection studies

Background:

• Speciation rates vary widely, but causes remain unclear.
• Sexual selection is recognized as a factor in speciation, primarily focusing on female mate choice.
• Emerging research suggests postmating reproductive conflicts between sexes may also drive speciation.

Purpose of the Study:

• To investigate the role of postmating sexual conflict in driving speciation rates.
• To test the hypothesis that antagonistic coevolution between sexes accelerates evolutionary divergence.
• To contrast speciation rates in insect groups with differing opportunities for postmating sexual conflict.

Main Methods:

• Comparative analysis of related insect species groups.
• Assessment of speciation rates based on mating systems (single vs. multiple mating by females).
• Focus on groups with varying degrees of postmating sexual conflict.

Main Results:

• Insect groups with higher opportunities for postmating sexual conflict exhibited significantly higher speciation rates.
• Speciation rates were four times higher in groups where females mate with multiple males compared to those with single mating.
• These findings support the role of sexual conflict in generating rapid evolutionary divergence.

Conclusions:

• Postmating sexual conflict is a significant driver of speciation.
• Antagonistic coevolution between sexes, fueled by postmating conflicts, can accelerate the speciation process.
• Sexual conflict emerges as a key engine of speciation, expanding our understanding beyond female mate choice.