Dinosaurs went down 10 MILLION years before they were exterminated, scientists say


Dinosaurs were in decline 10 million years before they were wiped out by the impact of a mass-extinct asteroid, scientists have found.

Six species, including tyrannosaurs, triceratops, and hadrosaurs, evolved and developed during the Cretaceous Period, which lasted from 145 to 66 million years ago.

But about 76 million years ago they suddenly went into decline, the researchers said, with extinction rates increasing and fewer new species emerging.

The main reason for the decline is believed to be a combination of global cooling – which caused a 7°C drop in Earth’s temperature – the loss of herbivores and the inability of the dinosaurs to adapt to new conditions.

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Adaptation Difficulty: Dinosaurs were in decline for 10 million years before they were wiped out by the impact of a mass-extinct asteroid, scientists have found

THE DECLINE OF DINOSAURS: KEY FINDINGS FROM THE STUDY

An international team of researchers analyzed 1,600 fossils from six dinosaur families: Ankylosauridae, Ceratopsidae, Hadrosauridae, Dromaeosauridae, Troodontidae and Tyrannosauridae.

They found that over the last 10 million years of dinosaur age, speciation rates have declined sharply and extinction rates have increased sharply.

This caused a rapid decline in species numbers just before the asteroid hit Earth and wiped out the non-avian dinosaurs 66 million years ago.

The main reason for the decline is believed to be a combination of global cooling – where the Earth’s temperature dropped by 7°C – the loss of herbivores and the inability of the dinosaurs to adapt to new conditions.

Many dinosaurs likely relied on warmer temperatures to thrive and thus had difficulty adapting to colder temperatures and new conditions on Earth, scientists believe.

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Mike Benton, study co-author and professor at the University of Bristol, said: “We looked at several possible causes of dinosaur decline.

“It became clear that there were two main factors, first, that the overall climate became colder, and this made life more difficult for the dinosaurs, who most likely depended on warmer temperatures.

“Then the loss of herbivores makes the ecosystem unstable and vulnerable to extinction.

“We also found that longer-lived dinosaur species were more likely to be threatened with extinction, which may be due to their inability to adapt to new conditions on Earth.”

The international research team analyzed 1,600 fossils from six dinosaur families: Ankylosauridae, Ceratopsidae, Hadrosauridae, Dromaeosauridae, Troodontidae and Tyrannosauridae.

One of the main findings is that a decrease in The diversity of herbivorous dinosaurs caused by their displacement by hadrosaurs may have played a role in the collapse of dinosaur ecosystems.

Lead author Fabien Condamine of the University of Montpellier said: “We looked at the six most abundant dinosaur families throughout the Cretaceous, spanning from 150 to 66 million years ago, and found that they all evolved and evolved clearly with success.

“Then, 76 million years ago, they showed a sudden decline. Their rate of extinction is increasing and in some cases the rate of emergence of new species is decreasing.’

About 10 million years later, non-avian dinosaurs became extinct, and more than half of the world’s species became extinct.

The asteroid Chicxulub, which plunged into the shallows in what is now the Gulf of Mexico, has often been cited as a possible cause of the Cretaceous-Paleogenic extinction.

This paved the way for the emergence of mammals and the eventual appearance of humans.

“This is a key moment in the evolution of life,” added Condamine. “The world has been ruled by dinosaurs for more than 160 million years, and as they receded, other groups began to dominate, including mammals.

“Dinosaurs were usually so large that they probably barely knew the little furry mammal was in the bush.

“But the number of mammalian species increased before the dinosaurs disappeared, and then after the impact they had the opportunity to create the new types of ecosystems we see today.”

Guillaume Guinot, also from the University of Montpellier, said: “In all cases we found evidence of a decline before the impact of the bolide.

“We also looked at how these dinosaur ecosystems worked, and it became clear that the herbivorous species disappeared first, making the newest dinosaur ecosystems unstable and prone to collapse when environmental conditions became dangerous.”

The new study will be published in the journal Nature Communications.

KILL THE DINOSAURS: HOW THE CITY’S BIG ASTEROID KILLED 75 PERCENT OF ALL ANIMAL AND PLANT SPECIES

About 65 million years ago, non-avian dinosaurs became extinct, and more than half of the world’s species became extinct.

This mass extinction paved the way for the rise of mammals and the emergence of humans.

The asteroid Chicxulub is often cited as a possible cause of the Cretaceous paleogenic extinction.

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The asteroid crashed into the shallows in what is now the Gulf of Mexico.

The collision released an enormous cloud of dust and soot, which triggered global climate change and wiped out 75 percent of all animal and plant species.

The researchers claim that the soot needed for such a global catastrophe could only come from a direct impact on rocks in the shallow waters around Mexico that are very rich in hydrocarbons.

Experts believe a massive tsunami swept across the Gulf Coast within 10 hours of impact.

About 65 million years ago, non-avian dinosaurs became extinct, and more than half of the world’s species became extinct. The asteroid Chicxulub is often cited as a possible cause of the Cretaceous paleogenesis extinction (stock image)

This causes earthquakes and landslides in areas as far away as Argentina.

But when the waves and eruptions were taking place, the creatures living at that time not only suffered from the waves – the heat was much worse.

While investigating the event, the researchers discovered small rock particles and other debris that were thrown into the air as the asteroid crashed.

These tiny particles, known as spheres, cover the planet with a thick layer of soot.

Experts claim that the loss of light from the sun causes the complete collapse of the water system.

This is because the phytoplankton base will be removed from almost all aquatic food chains.

It is believed that the more than 180 million years of evolution that brought the world to the Cretaceous were destroyed in less than the life span of Tyrannosaurus Rex, which is roughly 20 to 30 years.

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