If you looked up 66 million years ago you might have seen, for a split second, a bright light as a mountain-sized asteroid burned through the atmosphere and smashed into Earth. It was springtime and the literal end of an era, the Mesozoic.
The extinction rate of a lineage, in this case angiosperms, can be estimated using mathematical models. The one we used compared ancestor age with estimates for how many species should be appearing in a family tree according to what we know about the evolution process.with estimates of how long it takes for a new species to evolve. This gives us a net diversification rate—how fast new species are appearing, adjusted for the number of species that have disappeared from the lineage.
The model generates time bands, such as a million years, to show how extinction rate varies through time. And the model allowed us to identify time periods that had high extinction rates. It can also suggest times in which major shifts in species creation and diversification have occurred as well as when there may have been a mass extinction event. It shows how well the DNA evidence supports these findings too.
We found that extinction rates seem to have been remarkably constant over the last 140–240 million years. This finding highlights how resilient angiosperms have been over hundreds of millions of years.showing that many angiosperm species did disappear around K-Pg, with some locations hit harder than others. But, as our study seems to confirm, the lineages to which species belonged carried on undisturbed, creating life on Earth as we know it.
This is different to how non-avian dinosaurs fared, who disappeared in their entirety: their entire branch was pruned.to the K-Pg mass extinction may be explained by their ability to adapt. For example, their evolution of new seed-dispersal and pollination mechanisms. which provides a second copy of every single gene on which selection can act, potentially leading to new forms and greater diversity.may follow a similar trajectory.
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