Study suggests asexual reproduction slowed early animal evolution during Ediacaran period

A new study published in Nature Ecology and Evolution suggests that the earliest animals on Earth may have inadvertently slowed biodiversity expansion through their reproductive strategy. Researchers from the University of Cambridge analyzed fossils from the Ediacaran period, when the first animals emerged, and found that many reproduced asexually by producing genetically identical offspring connected by runners, similar to modern strawberry plants. Using laser scanning, spatial analysis, and artificial intelligence on fossils from Mistaken Point in Newfoundland, the team created computer simulations to test how different reproductive strategies affected early animal communities. The results indicated that asexual reproduction limited dispersal and reduced competition among neighboring organisms, which decreased evolutionary pressure for change. As organisms later began reproducing sexually and spreading to shallower, more challenging marine environments with greater competition for resources, animal diversity increased dramatically, explaining the transition from the slow-evolving Ediacaran to the rapid diversification of the Cambrian period.