Climate change was killing the dinosaurs before the asteroid impact – study

The global cold period caused a sharp decline in the number of dinosaur species about 10 million years before the extinction caused by asteroidAccording to a study conducted in June.

The study published in Nature ConnectionsIt was the product of an international collaboration involving paleontologists from the University of Montpellier in France, the University of Bristol in the United Kingdom, and the University of Alberta in Canada.

Approximately 66 million years ago, 12 km. An asteroid hit the Yucatan Peninsula in Mexico, beginning a nuclear winter that caused the extinction of the dinosaurs.

The team of researchers focused on six families of dinosaurs, three carnivores and three herbivores, which survived the 40 million years of evolution until the asteroid collided with Earth. They examined the fossils of more than 1,600 individual dinosaurs from about 250 different species in total.

The results show that the biodiversity of the six families was already in sharp decline, about 10 million years before the asteroid impact. The results of the studies are significant, as the decline in dinosaur biodiversity can be seen around the world, in both herbivorous and carnivorous species.

Interestingly, the only family that showed a slight decrease in biodiversity before the asteroid was the Troodontidae, a family of bird-like dinosaurs. Birds are known to have an evolutionary relationship with dinosaurs.

The researchers noted that the number of herbivorous dinosaurs declined slightly before the carnivores, making it highly likely that the decline of the herbivorous species directly caused the decline of the carnivorous species.

This is an example of a cascade effect, where extinction occurs due to the prior extinction of different species in an ecosystem.

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One theory that explains why dinosaur numbers declined before extinction is climate change. During the Cretaceous period, between 145.5 and 65.5 million years ago, the Earth underwent a global cooling period of 7-8 degrees Celsius.

dinosaurs, who were mesophilic animals—meaning they needed a warm climate to maintain their body temperature and metabolic function—must have been severely affected by this global cooling period.
New information about dinosaurs as well as fossils is being discovered every day. In June, scientists discovered new type in Australia.

Olga Dmitrieva

Любитель алкоголя. Возмутитель спокойствия. Интроверт. Студент. Любитель социальных сетей. Веб-ниндзя. Поклонник Бэкона. Читатель

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