Published online by Cambridge University Press: 07 September 2019
Rocky subtidal communities are important along the entire north-east Atlantic coast, from those of wave-exposed open coasts and coastal archipelagos through to sheltered inlets and bays, from warm-temperate to Arctic environments. The character of the communities on the north-east Atlantic subtidal hard substratum is determined especially by the amount of light reaching the seabed and by the strength of water flow, including wave action and tidal currents. Those physical factors may be significantly modified by interactions between species, including competition, predation and grazing; and from human activities, such as waste disposal or agricultural run-off (causing eutrophication) and by harvesting. Grazing is a major structuring agent in determining the distribution of algae and animals and may create large differences in species richness and abundance. In the future, changes might occur as ocean warming influences the growth, survival and abundance of key structural or functional species.
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