THE BASIC ZONATION 



311 



height of the spring tides. On an exposed coast the shore is open to 

 considerable wave action and a heavy spray dashes against the rocks 

 to a height of several feet. As a result of this wave action the upper 



Table XIII 



Feet 

 above 



M.L.W. 



13 

 12 

 II 

 10 



Bembridge 

 I.O.W. 



Peveril Point 

 Dorset 



8 Fucus ceranoides Cyanophyceae 



7 Fucus ceranoides 



Ascophyllum 

 6 Ascophyllum 



5 Ascophyllum 

 Fucus vesiculosus 



4 Ascophyllum 

 Fucus vesiculosus 

 Fucus serratus 



3 Ascophyllum 

 Fucus vesiculosus 

 Fucus serratus 



2 Fucus vesiculosus 

 Fucus serratus 



I Fucus serratus 



M.L.W. Fucus serratus 



— I Fucus serratus 



— 2 Halidrys 



— 3 Halidrys 



Laminaria 



Tidal 8-9 ft. 

 range 



Cyanophyceae 



Porphyra 



Porphyra 



Fucus spiralis 



Porphyra 



Fucus spiralis 



Bare 



Fucus spiralis 



Bare 



Bare 



Fucus serratus 



Laurencia 



Fucus serratus 



Laminaria 



Laurencia 



Fucus serratus 



Laurencia 



Laminaria 



6-5 ft. 



Castletown 

 I.O.M. 



Porphyra 



Porphyra 



Porphyra 



Pelvetia 



Ascophyllum 



Pelvetia 

 Fucus spiralis 

 Ascophyllum 

 Fucus spiralis 

 Ascophyllum 

 Fucus vesiculosus 



Fucus vesiculosus 

 Laurencia 

 Fucus vesiculosus 

 Laurencia 

 Fucus vesiculosus 

 Laurencia 

 Fucus serratus 

 Laurencia 

 Fucus serratus 



Laurencia 



Himanthalia 



Himanthalia 



Laminaria 

 Laminaria 



18 ft. 



Cumbrae 

 Firth of Clyde 



Enteromorpha 

 (fresh-water 

 drainage) 



Porphyra 



Pelvetia 



Pelvetia 

 Fucus spiralis 

 Fucus spiralis 



Ascophyllum 



Laurencia 



Ascophyllum 



Laurencia 



Fucus vesiculosus 



Ascophyllum 



Fucus vesiculosus 



Ascophyllum 



Fucus serratus 



Fucus serratus 



Fucus serratus 

 Laminaria 

 Laminaria 

 Laminaria 



10 ft. 



zones are often i or 2 ft. higher than might otherwise have been 

 expected, and the height by which these zones are elevated is 

 termed the ''splash zone". At Peveril Point the splash zone is 

 about I ft., whereas at Wembury in Dorset and Mount Desert 

 Island in Maine it is computed at 2 ft. 



