Polyandry in Noctuid Moths: Taxonomic, Bionomic, and Evolutionary Implications

Area of Science:

• * Entomology
• * Evolutionary Biology
• * Sexual Selection

Background:

• * Polyandry, where females mate with multiple males, is prevalent in Noctuidae moths, including pest species.
• * Mating involves costly spermatophore transfer, repeated in polyandry, leading to sexual selection and increased heterozygosity.
• * The study investigates the link between polyandry, genitalia morphology, and species diversity in moths.

Purpose of the Study:

• * To test the hypothesis that asymmetric male genitalia enhance sexual selection and promote speciation in polyandrous moths.
• * To explore the relationship between polyandry levels, ecological factors (habitat specialization), and species diversity.
• * To identify factors influencing polyandry in Noctuidae moths for potential applications in plant protection.

Main Methods:

• * Comparative analysis of male external genitalia morphology in polyandrous moth species (subtribe Poliina).
• * Correlation analysis between genitalia asymmetry and species diversity.
• * Examination of fecundity data and life cycle variations in relation to polyandry levels.

Main Results:

• * Evolution of secondary asymmetry in male genitalia is linked to increased species diversity in polyandrous Poliina moths.
• * Species like Orthosia and Conistra exhibit moderate to high polyandry, influenced by life cycles despite similar reproductive timing.
• * Preliminary data suggest habitat generalists may be more polyandrous than specialists, though further data are needed.

Conclusions:

• * Asymmetric male genitalia likely play a role in enhancing sexual selection and driving speciation in polyandrous moth lineages.
• * Life cycles and potentially ecological factors influence the degree of polyandry in Noctuidae moths.
• * Further research on sex ratios and polyandry is recommended for understanding pest management implications.