Overview
- The study by Emily Mitchell and Andrea Manica, published in June 2026 in Nature Ecology & Evolution, analysed 574-million-year-old fossils from Mistaken Point using laser scanning, spatial statistics and Approximate Bayesian Computation to infer how early animals reproduced.
- Their models and spatial patterns match asexual, stolon-based reproduction that produced nearby clones and limited dispersal, which reduced competition and kept species diversity low for millions of years.
- Simulations show that when Ediacaran life moved into shallower, more variable waters, increased stress from tides, storms and changing nutrients favoured sexual reproduction and longer-range dispersal, coinciding with the Ediacaran ‘second wave’ and the lead-up to the Cambrian burst.
- The result is an inference-driven, model-backed hypothesis that links reproductive mode and habitat change to macroevolutionary tempo, but the authors and commentators stress it needs more field sampling, sedimentary and geochemical evidence for confirmation.
- If supported by further data, the work would resolve why early animals changed so little for tens of millions of years and reshape views of where and when key biological innovations like sex and wider dispersal first arose.