The rocky and boulder shores toward the south of the lough are dominated by the seaweed knotted wrack " Ascophyllum nodosum ".
2.
On sheltered shores " Ascophyllum nodosum " usually forms a broad and dominating zone along the shore at the mid-littoral.
3.
Phlorotannins in the brown algae " Fucus vesiculosus " and " Ascophyllum nodosum " act as chemical defenses against " L . littorea ".
4.
Commercial varieties of alginate are extracted from seaweed, including the giant kelp " Macrocystis pyrifera ", " Ascophyllum nodosum ", and various types of " Laminaria ".
5.
Usually devoid of vegetation, that may be present include smooth cordgrass ( " Spartina alterniflora " ), marine algae such as knotted wrack ( " Ascophyllum nodosum " ) and rockweeds ( Fucus spp . ).
6.
Along the lower shore the coarse grained rocks are partly covered by brown seaweeds such as Flat wrack " ( Fucus spiralis ) " and Knotted wrack " Ascophyllum nodosum ", while pools and crevices in the rocks provide shelter for a wide variety of algal species, such as the red seaweed " Corallina officinalis ".
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