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U-Shaped Horizontal Swimming Technique for Preparing High-Quality Sperm with Low DNA Fragmentation Index
Published on: March 28, 2025
806
Team swimming in ant spermatozoa.
Morgan Pearcy1, Noémie Delescaille2, Pascale Lybaert3
1Evolutionary Biology and Ecology, Université Libre de Bruxelles, Brussels 1050, Belgium mpearcy@ulb.ac.be.
Biology Letters
|June 13, 2014
Summary
In desert ants, males ejaculate sperm in bundles. These sperm bundles swim faster than individual sperm, increasing fertilization success and enhancing male reproductive fitness after death.
Area of Science:
- Reproductive biology
- Evolutionary biology
- Behavioral ecology
Background:
- Female promiscuity drives sperm competition, influencing male reproductive traits.
- In eusocial Hymenoptera, males have limited reproductive opportunities, making sperm storage crucial.
- Queen mating frequency exerts selective pressure on male sperm transfer strategies.
Purpose of the Study:
- To investigate sperm cooperation in the desert ant Cataglyphis savignyi.
- To determine if grouped spermatozoa exhibit enhanced motility compared to solitary ones.
- To understand the adaptive significance of sperm bundling in this species.
Main Methods:
- Observation of ejaculate composition in Cataglyphis savignyi.
- Comparative analysis of swimming speeds between bundled and solitary spermatozoa.
- Assessment of potential fitness benefits related to sperm storage.
Main Results:
- Male desert ants ejaculate spermatozoa in bundles of 50-100 cells.
- Sperm bundles demonstrated a 51% increase in swimming speed compared to individual sperm cells.
- This cooperative swimming is hypothesized to improve sperm storage in the queen.
Conclusions:
- Spermatozoa cooperation is a novel reproductive strategy observed in Cataglyphis savignyi.
- Enhanced sperm motility through bundling likely increases the quantity of sperm stored by the queen.
- This mechanism enhances posthumous male reproductive success in a species with high sperm competition.
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