The MarClim project was a four year multi-partner funded project created to investigate the effects of climatic warming on marine biodiversity. In particular the project aimed to use key intertidal species, whose abundances had been shown to fluctuate with changes in climatic conditions, as indicators of changes occurring in the intertidal and offshore. The project used historic time series data, from the 1950s onwards, and contemporary data to provide evidence of changes in the abundance, range and population structure of intertidal species and relate these changes to recent rapid climatic warming. In particular quantitative counts of barnacles, limpets and trochids were made as well as semi-quantitative surveys of up to 56 intertidal taxa. Historic and contemporary data informed experiments to understand the mechanisms behind these changes and models were created to predict future species ranges and abundances. To view the key findings and conclusions of the MarClim project.