A new study may explain why Megalodon went extinct
A new study suggests that Megalodon, 지금까지 살았던 가장 큰 해양 포식자, may have gone extinct due to the giant shark’s body temperature. As the oceans cooled, the sharks may have been forced to lower latitudes where ocean temperatures were warmer, while its prey evolved to withstand cooler temperatures of higher latitudes.
Megalodon, the apex predator of the seas, was the largest 상어 to ever live, at nearly 60 feet in length. A recently published study suggests the massive shark reached its epic size because of oophagy: a kind of intrauterine cannibalism behavior.
연구, 과학 저널에 게재 Historical Biology, suggests that these massive sharks were born more than 6 feet in length, thanks to eating undeveloped siblings while still developing during pregnancy.
“The gigantism of O. megalodon is attributed to the evolution of regional endothermy, possibly along with the inferred live-bearing reproductive mode involving intrauterine cannibalism in the form of oophagy,” researchers wrote in the study. “아직, exactly how O. megalodon developed throughout its lifetime has remained largely in the realm of speculations.”
MEGALODON FOSSILS DISCOVERED ALL OVER THE WORLD
In-utero cannibalism is not uncommon among sharks. 11 월 2019, a species of shark discovered in Kansas also portrayed in-utero “cannibalistic behavior.”
9 월, 별도의 연구자 그룹 determined the true size of the megalodon’s body, including its huge fins, based on fossils. A 52.5-foot-long megalodon likely had a head 15.3 긴 발, a dorsal fin approximately 5.3 feet tall and a tail around 12.6 ~ 피트 높이, the scientists found.
The scientists, led by Kenshu Shimada, used a number of methods to come up with their findings, including CT scans with multiple X-rays to reconstruct fossils and get an idea of how large a megalodon was at birth.
Shimada and the other experts also determined that the massive shark grew 6.3 inches per year for the first 50 years of its life. Megalodons had a life expectancy of around 88 years and could have reached 100 살이에요, the experts suggested.
“As one of the largest carnivores that ever existed on Earth, the evolution and extinction of O. megalodon must have contributed to shaping the present-day marine ecosystem,” the researchers added. “Hence, deciphering such growth parameters of O. megalodon is critical to understand the role large carnivores play in the context of ecology and evolution.”
The megalodon may have become extinct thanks to being outmaneuvered and outdone by its smaller, more agile cousin, the great white.
PREHISTORIC SHARK WITH ‘SPACESHIP-SHAPED TEETH’ DISCOVERED ALONGSIDE MOST FAMOUS TYRANNOSAURUS
Other theories suggest the megalodon was killed off by an exploding star approximately 2.6 백만년 전.
Another theory that has gotten a lot of attention in recent memory is that the megalodon simply was unable to regulate its body temperature. Cooler ocean temperatures during the Pliocene era led its preferred food, whales, to adapt, while the megalodon was unable to,
During the Pleistocene extinction event, many animals larger than 80 pounds went extinct, 에 따르면 Illinois State Museum. At roughly 50 feet in length and a weight approaching 120,000 파운드, megalodons would have been a prime candidate to be affected by the cosmic blast.
폭스 뉴스’ James Rogers contributed to this story.
