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The spat~al pattern of limpet grazing has been previously hypothesised to drive a mosaic of algal patches on moderately exposed shores in the northeast Atlantic. The presence of differently aged algal patches and spatial effects associated with llmpets were tested for using spatially referenced data sets. Algal and limpet occurrences in 0.01 m2 cells we]-e recorded in a series of 25 mZ quadrats on shores on the Isle of Man. All sites showed small-scale spatial autocorrelation for limpets and mature and juvenile algae. Hence the sites surveyed had an uneven distribution of limpets superimposed on a mosaic of differently aged patches of algae. The local density of limpets was related to the probability of a cell containing juvenile algae in 7 of the 10 quadrats surveyed. Where they had an effect, limpets generally reduced the probability of juvenile algae being recorded locally, as would be predicted by the grazer-driven mosaic hypothesis.

Spatial structure on moderately exposed rocky shores:patch scales and the interactions between limpets and algae