Abstract
Along the coast of Somerset, the numbers of animal and plant species progressively decline from west to east. Changes in zonation patterns thus reflect a decrease in species richness as well as the direct influences of increasing tidal range and turbidity. The patterns are also complicated by the differing rock types: quartzite to the west, limestone to the northeast with softer marls and shales inbetween. The overall appearance of some shores has changed in recent years as a result of fucoid responses to hot summers and cold winters. This has greatly influenced community structure. In contrast to the Quoddy Region (Bay of Fundy), Ascophyllum nodosum is confined to sheltered sites whilst Nucella lapillus (together with several other gastropods) becomes increasingly restricted to lower levels - especially where a fucoid canopy is present.
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