An abstract of the study on the effects of temperature and nutrients on growth, survival and physiology of sic intertidal seaweeds is presented. There is evidence that some seaweeds have changed in abundance and range along the North Atlantic in recent years, and climatic drivers are often invoked as potential culprits for these changes. In the particular case of northwest Iberia, recent decadal changes in the frequency of occurrence of several intertidal perennial seaweeds coincided with variations in temperature and nutrient regimes. To further investigate whether water warming and nutrient availability may be behind the observed changes, the influence of temperature and nutrient availability (high vs low) on growth, survival and physiology was compared among six intertidal seaweeds whose frequency has recently changed in NW Iberia. By comparing the responses of species that recently followed diverging upward and downward trends, the authors will be able to better assess the actual role played by temperature and nutrient availability as drivers of the trends observed in the field.