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Rocky shore monitoring,around,the Sullom Voe Oil Terminal in Shetland has produced,a 20-year dataset of population fluctuations,for 40-plus species at 15 to 20 sites separated,by distances up to 30km.Synchrony,in population changes,was quantified by correlation among,series ofabundance,categorised,on quantitative scales. Two periods were analysed separately, pre- and post-1992, following changes,in methods and extent of monitoring. Positive average,correlations among sites were found for 10 out of 16 species pre-1992 and for 23 out of 26 post-1992, statistically significant for 4 and 8 species for the two periods respectively. The intertidal barnacle Semibalanus balanoidesshowed,most synchrony,among,sites for both periods, while dogwhelks Nucella lapillusand macroalgae (Fucus vesiculosus, F. serratus, Mastocarpus stellatus) had very low average correlations among sites. Littorina saxatilis was the only other species with significant positive correlation among sites in both periods. Corallinaceae, Verrucaria maura and V. mucosa, and Littorina neglecta were less synchronised pre-1992 than post-1992, while Littorina obtusata showed,less synchrony,post-1992.  Differences in reproductive biology and ecology,failed to explain patterns of

Spatial synchrony of population changes in rocky shore communities in Shetland