Megalodon. The very name conjures awe: A giant shark that once dominated the world's oceans, big enough to swallow a human whole. Such a beast – known only from teeth and vertebrae that survived the 3.6 million years since it went extinct – must
appear to have occupied a similar mean trophic level, a finding that may hold clues to the extinction of the gigantic Neogene megatooth shark."
Here's how it works. Combinations of isotopes in any given environment are taken up by organisms in that environment. When something with teeth comes along and eats those organisms, they also absorb the isotopes. Some of those isotopes replace some of the calcium phosphate in the muncher's teeth and bones, which scientists can use to better understand their diet.
of an organism – that's the position it occupies in the food web – the lower the values of the zinc isotope ratios.However, very little analysis had been done on non-mammalian marine vertebrates, and this is the niche McCormack and his team sought to address.
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