2021-06-30

[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction

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[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction

The main author of the paper, CNRS researcher Fabien Condamine from the Montpellier Institute of Evolutionary Sciences (France) said: “We observed the largest population of the Cretaceous The six dinosaur families spanned from 150 million years to 66 million years ago, and it was discovered that they were all evolving and expanding as a whole, which was obviously successful.”

But then he said: “However, 76 million years ago, they showed a sudden decline. Their extinction rate increased, and in some cases, the origin rate of new species also declined.”

The team used Bayesian modeling techniques to explain several uncertainties, such as incomplete fossil records, uncertainties in fossil age determination, and uncertainties in evolutionary models. Each model was run millions of times to consider all these possible sources of error and to find out whether the analysis would converge to an agreed most probable result.

Guillaume Guinot of the Montpellier Institute for Evolutionary Sciences also helped with the calculations. He added: “In all cases, we found evidence of decline before the crater impact. We also After studying how these dinosaur ecosystems work, it is clear that plant-eating species often disappear first, which makes the latest dinosaur ecosystem unstable. If environmental conditions become harmful, it will easily collapse.”

Another co-author of the paper, Professor Mike Benton from the School of Earth Sciences at the University of Bristol, added: “In the analysis, we explored the decline of dinosaurs. The possible reasons for the different types. Obviously, there are two main factors. First, the overall climate has become colder, which makes the life of the dinosaurs that may depend on warm temperatures more difficult. Then, the disappearance of herbivores makes the ecosystem become Unstable and prone to a cascade of extinctions. We also found that long-lived dinosaur species are more likely to become extinct, perhaps reflecting their inability to adapt to the new conditions on Earth.”

Fabien Condamine said: “This is a critical moment in the evolution of life. The world has been dominated by dinosaurs for 160 million years. With their decline, other groups have begun to rise, including the dominance of mammals. Dinosaurs. Most of them are so huge that they may hardly know that the furry little mammals are in the bushes. However, before the dinosaurs disappeared, the number of mammalian species began to increase, and then after the impact, they had the opportunity to build the new types we see today. ecosystem”.

[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction(1)

[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction(2)

[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction(3)

[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction(4)

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p >[Picture] New research shows that dinosaurs had decayed for more than 10 million years before the planet’s impact and extinction(5)