What Zinc Means for Megalodon’s Extinction | SciShow News

TL;DR

Scientists can determine the trophic level of extinct species, such as megalodon, by analyzing the zinc content in their fossilized teeth.

Transcript

thanks to brilliant for supporting this scishow news video you can keep building your stem skills at brilliant.org scishow with 20 off in annual premium subscription sharks are fascinating creatures and none are more interesting than the biggest shark to ever swim megalodon this week in nature communications scientists report a way to use fossilize... Read More

Key Insights

• 😋 Fossilized shark teeth can provide information about the trophic level and food web interactions of extinct species.
• 🦷 The zinc content in teeth can serve as an effective indicator of trophic level due to its acquisition through an animal's diet.
• 😋 The study suggests that the modern great white shark may have competed with megalodon in the food web.
• 🧑‍⚕️ Sequencing ancient DNA can offer valuable insights into the genetic ancestry and possible health conditions of past populations.
• 🤑 Pompeii, a Roman port city, has provided a rich source of ancient DNA for scientific study.

Questions & Answers

Q: How can scientists determine the trophic level of extinct species like megalodon?

Scientists can analyze the ratio of two zinc isotopes in the teeth of these species, as zinc content correlates with trophic level.

Q: What did the study reveal about the trophic level of megalodon compared to its ancestors?

The study suggests that megalodon occupied a high trophic level, and the modern great white shark may have competed with it for the same food sources.

Q: Why is the zinc content in teeth a good indicator of trophic level?

Zinc is obtained through an animal's diet, and the ratio of zinc isotopes can reveal the extent of plant-based versus animal tissue-based consumption, thus indicating trophic level.

Q: How does the study of Pompeian DNA contribute to our understanding of the ancient population?

Scientists have successfully sequenced the genome of a Pompeian citizen, providing insights into their genetic ancestry and potential health conditions.

Summary & Key Takeaways

• Scientists have found a way to use fossilized shark teeth to determine the trophic level of extinct species, including megalodon.

• By analyzing the ratio of two zinc isotopes in the teeth, researchers can understand the position of these species in the food web.

• The study suggests that megalodon's place in the food web may have been influenced by competition from the ancestor of modern great white sharks.