Rock and hard substrata can occur throughout the intertidal
range and is dominated by different groups of characteristic organisms in the low,
mid and upper shore; a distribution pattern known as intertidal zonation.
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| Channel Wrack (Pelvetia canaliculata) occurs within a defined tidal range on the rocky shore. |
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| On this rocky shore in the Hebrides different seaweeds can be seen occurring within distinct vertical bands on the shore: Channel Wrack (Pelvetia canaliculata), below which Spiral Wrack (Fucus spiralis) occurs and lower down Egg Wrack (Ascophyllum nodosum). |
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