Tokyo, Japan – Researchers from Tokyo Metropolitan University have shown that the environmental development of a unique ovipositor in female fruit flies Drosophila suzukii may have caused the development of male genitals; New properties have been shown to cause mechanical incompatibility in reproduction with similar species, prevent crossing and isolate the species. The dual role of the female gender role was found to trigger coholution and speculation, a generic pathway that may apply to many other organisms.
Drosophila suzukii fruit fly is a fruit-damaging pest. The thin, saw-like, serrated ovipositor, the woman's ovarian body, makes it possible to penetrate the hard skin of mature fruits, unlike most other species of fruit fly that prefer smoother rotating fruit. They are thus a serious problem in invaded areas, now including Europe and America where they have recently been introduced. But a team of researchers from Tokyo Metropolitan University led by Assoc. Prof. Aya Takahashi saw a unique opportunity to study how such ecologically driven evolutionary properties can affect the coincidence of male and female genitals. Such a study would help us understand how the specific functions of the reproductive organs can influence how different species of organisms develop.
The team found that the unique ovipositor of D. suzukii had advantages for offspring, but required significant changes in male genitals to meet the barrier during copulation. By making the nail transparent, the team could immediately confirm that changes in ovipositor had caused drastic changes in the position of the flies. This included structural changes in the male genitals to attach to the end of the ovipositor without relying on params, nails that help the cockpit to lock under six. They confirmed that surgical changes to prevent the params from having proper contact with female genitals in siblings resulted in a significant decrease in reproductive success, while D. suzukii was less affected. However, this did not in any way make them more likely to reproduce. In fact, the new morphology adopted by the male genitals of D. suzukii made them incompatible with the shorter ovipositories of other fruitflies. This made it harder for crossbreeding to occur, effectively isolate D. suzukii and put them on another development trail.
It is evident that the evolution of the ovipositor is driven by the need to give a better chance of survival in an open niche. The team's findings, however, show that the dual function it plays as a means of collecting as well as laying eggs has caused a feedback to the genital coupling mechanism that causes significant changes in the shape and function of other genital genitals and changes the evolutionary pathway that the species follows in the process. Thus, their work gives a rare insight into how ecological changes drive the coincidence between male and female genitals, which may be a more generic mechanism of development and speciation in the natural world.