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Plants in Ice-Free Pockets
Age 15 · Biology
During ice ages, glaciers covered most mountain ranges. A few rocky pockets stayed free of ice, and the plants living there became isolated from one another.
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Age 15: open this week
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In the picture
- The glacier surface: the ice sheet covering most of the mountain range.
- The bare rocky ground inside a pocket: an ice-free patch on the ridge.
- A small flowering plant: one species growing only in its pocket.
- The ice saddle between two pockets: the frozen gap that keeps the plants apart.
Examples
- Different kinds of finches on separate Galápagos islands cannot easily mix.
- Wildflowers on separate mountain peaks may be found on only one peak.
Key takeaways
- Ice sheets can split one plant population into small, separate groups.
- Long isolation can produce unique species with very small ranges.
Quiz: Plants in Ice-Free Pockets (Age 15)
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According to the card, what happened to plants that lived in ice-free pockets during ice ages?
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What can long isolation of separate plant groups lead to, according to the card?
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What does the ice saddle between two pockets do?
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