It's Weird How Many Species Live At Both Poles

TL;DR

Some species, known as bipolar species, exist in both the Arctic and Antarctic, but scientists are still trying to understand how they manage to survive and exchange genes across such vast distances.

Transcript

Thanks to Brilliant for  supporting this SciShow video! As a SciShow viewer, you can keep  building your STEM skills with a 30 day free trial and 20% off an  annual premium subscription at Brilliant.org/SciShow. You’d be forgiven for assuming that the Arctic and the Antarctic are pretty  similar, ecologically speaking. After all, how different can ... Read More

Key Insights

• 💄 The Arctic and Antarctic have distinct environments and conditions, making it challenging for species to exist in both regions.
• 🏊 Some species, including whales, have the ability to swim between the poles, but small creatures pose a more significant mystery in terms of their distribution.
• 🛀 Genetic analyses have shown that some supposedly bipolar species may actually be separate species across the poles.
• 🤢 Deep-sea organisms like ciliates and foraminifera exhibit genetic similarities across both poles, suggesting conservation of genes.
• 🐦 Overhunting and habitat destruction have impacted the populations of certain migratory birds, potentially affecting the dispersal of bipolar plants.
• 🌊 Climate change and its effects on deep-water currents may have implications for the global distribution of deep-sea organisms.
• 💐 Further studies are needed to understand the mechanisms of gene flow and species distribution between the Arctic and Antarctic.

Questions & Answers

Q: How far apart are the Arctic and Antarctic regions?

The Arctic and Antarctic are approximately 12,000 kilometers apart at their closest point.

Q: What are bipolar species?

Bipolar species are those that have populations higher than 55 degrees North or lower than 52 degrees South, meaning they exist in both polar regions.

Q: How do larger animals like whales travel between the Arctic and Antarctic?

Whales can swim between the poles, utilizing the warmer waters in between as well.

Q: How are smaller creatures like algae and bacteria found in both poles?

The mechanism through which small creatures disperse between the poles is still a mystery, and scientists are studying possible explanations such as ocean currents and long-distance dispersal.

Summary & Key Takeaways

• The Arctic and Antarctic have drastic environmental differences, but there are species that manage to exist in both polar regions.

• While larger animals like whales can swim between the poles, smaller creatures such as algae and bacteria present a mystery as they don't seem to have habitats in between.

• Genetic analyses have revealed that some species considered bipolar may actually be multiple separate species, while others show surprising genetic similarities across the poles.