It's not hard to see where this seaweed got its name. The large, sturdy single bladders filled with gas in the middle of the fronds look like large knots. These 'airbags' help the plant to stand up straight under water. Knotted wrack is found in the North Sea and along the Atlantic coasts. The species attaches itself to rocks and stones in the middle of the tidal region. It can survive for a long time after breaking off from its base. All sorts of other seaweed species grow underneath knotted wrack, species that without protection would normally dry out during ebbing water. This seaweed also provides shelter for small marine animals.
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