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Two low intertidal assemblages dominated in 1977 by Bifurcaria bifurcata and Cystoseira baccata-Saccorhiza polyschides in the North coast of Spain show changes in the structure and dynamics after 30 years. A re-survey in 2007 detected phenological changes affecting the annual cycle of dominant canopy species. B. bifurcata has shortened its growth period and undergone a decrease in biomass, while C...