Climatic change has been implicated as the cause of abundance fluctuations in marine fish populations<br/>worldwide, but the effects on whole communities are poorly understood. We examined the effects of<br/>regional climatic change on two fish assemblages using independent datasets from inshore marine (English<br/>Channel, 1913–2002) and estuarine environments (Bristol Channel, 1981–2001). Our results show that<br/>climatic change has had dramatic effects on community composition. Each assemblage contained a subset<br/>of dominant species whose abundances were strongly linked to annual mean sea-surface temperature.<br/>Species’ latitudinal ranges were not good predictors of species-level responses, however, and the same<br/>species did not show congruent trends between sites. This suggests that within a region, populations of the<br/>same species may respond differently to climatic change, possibly owing to additional local environmental<br/>determinants, interspecific ecological interactions and dispersal capacity. This will make species-level<br/>responses difficult to predict within geographically differentiated communities.<br/
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