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Dinosaurs may have declined for millions of years before meteor landslides often resulted in extinction. That’s according to research published Tuesday examining the role of climate change.
The Chicxulub meteorite, which crashed into what is now Mexico’s Yucatan Peninsula some 66 million years ago, is thought to have led to a Cretaceous-Paleogene extinction event that killed three-quarters of the world̵7;s population. including dinosaurs
Now, new research suggests that a number of fearsome chameleons may have dropped to 10 million years before the meteor hit.
The research, published in the journal Nature, examined data from 1,600 dinosaur remains found around the world to model how some carnivorous and herbivorous dinosaurs were common in the late Cretaceous.
The team found that the species declined about 76 million years ago.
Fabian Kondamine from the Institute of Evolutionary Sciences at the University of Montpellier. And lead researcher said his team tracked the degeneration of six dinosaur families, which comprise nearly 250 different species.
“We had the highest diversity about 76 million years ago,” he told AFP.
“Then there was a decline that lasted 10 million years, which was more than the total duration of the Homo genus.”
The team found two possible explanations for the diversity of the falling dinosaurs listed in the fossil record and their own computer models.
For one thing, the rate of decline in this species corresponds to a cooling of the global climate about 75 million years ago, when temperatures dropped to eight degrees.
Condamine said dinosaurs were adapted to a geothermal climate — mostly warm and humid — that prevailed for tens of millions of years throughout their time on Earth.
“With a cold Like other large animals They might not be able to adapt,” he said.
The second possible explanation for the refusal came from what shocked the team.
while both herbivores and carnivores are expected to be affected approximately the same time. The team found that there was a delay of more than two million years between sequential declines.
“Therefore, the degradation of the prey herbivores It will make people eat less meat,” Kondamine said.
The results of the study concluded that not only cooler climates and reduced diversity among herbivores led to a slow decline in dinosaurs, but also that more and more species of dinosaurs were eroded. Unable to recover after meteorite collapse
“These factors hinder recovery from the last catastrophic event,” the report said.
© 2021 AFP