Seeds Travel By Sea

Monkey-ladder vine (highlighted in red) and its heart-shaped seeds (photos from Wikimedia Commons)

5 February 2021

Many plants that grow near water disperse their seeds by riding the water wherever it goes. Fabulous among this group are tropical plants whose drift seeds cross the ocean.

The monkey-ladder vine or sea bean (Entada gigas), above, produces hard-covered heart-shaped seeds that contain an air pocket to keep them buoyant. Seeds from the Caribbean and Central America wash into the ocean and float on the Gulf Stream. Some make landfall 15 months later on the shores of Scotland.

Map of the Gulf Stream from NOAA Scijinks

This selection of drift seeds was found at the Outer Hebrides.

Drift seeds collected in Western Isles, Outer Hebrides, Scotland (photo from Wikimedia Commons)

They can also be found at Orkney as seen in this video from BBC Winterwatch.

The drift seeds traveled more than 4,000 miles to reach Orkney’s beaches and so did a lot of other things.

p.s. Click here to see a map of Scotland showing the Outer Hebrides and the Orkney Islands.

(photos from Wikimedia Commons, tweet embedded from BBC Winterwatch)

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