New Model Ties 66-Million-Year-Old Marine Die-Off to Darkness and Body Size
Updated
Updated · BIOENGINEER.ORG · May 28
New Model Ties 66-Million-Year-Old Marine Die-Off to Darkness and Body Size
7 articles · Updated · BIOENGINEER.ORG · May 28
A trait-based ecosystem model found prolonged post-impact darkness and body size-dependent starvation thresholds drove which marine plankton died out at the K–Pg extinction 66 million years ago.
Decades of sharply reduced sunlight after the asteroid impact hit larger photosynthetic plankton hardest, while smaller species and mixotrophs survived by relying on alternative feeding strategies.
The simulations matched fossil evidence showing a post-extinction rise in small-bodied and mixotrophic plankton, strengthening the case that these traits shaped survival and recovery.
The study also points to regional differences in ocean stress and to pre-impact photo-acclimatization as factors that influenced resilience, offering a framework for testing extinction mechanisms in past and modern marine crises.
After the dinosaurs' asteroid plunged Earth into darkness, what survival secret allowed the tiniest ocean life to rebuild the world?
The asteroid impact was a planetary stress test. Does the survival of the smallest life reveal a universal rule for alien worlds?
Most scientists blame an asteroid for the mass extinction, but what if new evidence suggests volcanoes were the real killers?
80% Marine Species Lost: The Cretaceous-Paleogene Extinction and Its Modern Warnings
Overview
Around 66 million years ago, a massive asteroid struck the Yucatán Peninsula, creating the Chicxulub crater and triggering one of Earth's most devastating extinction events. This impact, which happened at sea, generated enormous tsunamis that swept across marine environments, causing widespread destruction. The aftermath led to a dramatic collapse of ecosystems, especially in the oceans, and resulted in the loss of about 80% of all animal species. This catastrophic event not only reshaped life on Earth but also cleared the way for new groups to rise and dominate in the following eras.