University of Siena

Sperm Cooperation, Not Competition, Drives Fertilization Success Across Arthropods, Landmark Study Reveals

- A large-scale comparative analysis published in Nature Communications reveals that sperm conjugation—coordinated group behavior—is widespread across arthropods, challenging the long-held view of fertilization as purely competitive. - Researchers from Syracuse University, University of Siena, and University of Szeged found that sperm-associated material (SAM) plays a key role in binding sperm together, with the ancestor of all insects possessing conjugated sperm. - The findings open potential applications in human fertility research and pest control, including targeting SAM to disrupt reproduction in invasive species like the spotted lanternfly. - The study highlights that evolution has repeatedly gained and lost sperm cooperation across 600 million years, underscoring cooperation's critical role alongside competition in reproductive success.