Before an asteroid wiped them out, dinosaurs were already in decline: study

Although asteroids struck the planet million 66 million years ago and wiped out non-avian dinosaurs on Earth, new research claims that the environmental degradation of dinosaur groups began long before the din historical event.

The Cretaceous-Terrier extinction instantly wiped out the most famous, rest5% endangered species of all mass extinction.

However, a study published in the journal Nature Communications found that dinosaurs from the Mexican asteroid Cixulub declined about 10 million years ago.


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“Our data indicates that there is a lot of release [nickel]Triggered by rich gases [Siberian Traps large igneous province (STLIP)] The chemistry of the late Permian Sea had changed for the better before Majmatism [end-Permian mass extinction (EPME)]“The authors say.

EPME – called “Great Dyeing” – occurred about 251 million years ago, killing more than 96% of the planet’s marine species, 70% of the land species, and signaling the end of the Permian period.

In 2015, researchers at the Massachusetts Institute of Technology (MIT) Earth and Planetary Science reported in the journal Science Advances that massive volcanic eruptions in the Siberian trap occurred at the right time to trigger the most deadly extinction event. For the past 540 million years, the connection has been called “inevitable.”


Although it is still unclear whether the explosive magnet was the primary trigger, Nature Study authors say the event’s “killing processes depend critically on the nature of the opening when the STLIP explodes.”

The carnivores – which were set in motion 300,00 years ago – include global warming, ultraviolet radiation exposure, hypercapnia, sea acidification and the release of anosia and toxic metals, including the presence of nickel isotopes.

“Our results provide strong evidence of global spread and loading of non-enriched aerosol particles in the Panthalasic Ocean,” the team wrote in the abstract of the report.

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The Panthalasic Ocean surrounds the Pangia subcontinent.

In a press release, CNN and Institute of Evolutionary Sciences of Montpellier (ISEM) research scientist Fabian Condamine said the team tested the evolutionary trends of six large families in the critical period, including the Tyrannosaurus, Triceratops and Hydrosorus.

Additionally, using a novel statistical modeling method that uses “limited bias with fossil record loopholes”, the team proved that inc surpassed extinction for dinosaurs 76 million years ago.

“The impact of a 12-kilometer-wide asteroid 66 million years ago was thus the coup d’tat of a group of animals already fighting,” the release said. “These searches, published Communication with nature June 29, show that the death of dinosaurs was probably linked to global cooling towards the end of the Cretaceous, when average global temperatures dropped. [seven degrees Celsius.]”


It is said that herbivores were particularly vulnerable to the first extinction, possibly “stopping cascading extinction among other dinosaur families.”

During the Cretaceous period, researchers looked at more than 1,600 records of dinosaurs, University of Edmonton professor Phil Curry told SI-News.

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“It became clear that there were two main reasons, first the overall climate was getting colder, and it made life harder for dinosaurs, which probably depended on warmer temperatures,” said Mike Benton, co-author of the study and University of Bristol Earth Sciences said in a statement. “Then, the loss of vegetarians has destabilized and endangered ecosystems. [an] Cascade of Extinction We also found that long-time dinosaur species were more responsible for extinction, perhaps reflecting that they could not adapt to new conditions on Earth. “


Significantly, not everyone agrees with their decision; Other conflicting studies have revealed that dinosaurs were still thriving when asteroids hit.

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