Abstract: [Results]: Temperature and light were the main predictors shaping the distribution of subtidal species, whereas wave energy, temperature and salinity were the main pre-dictors of intertidal species. The highest regional species richness for kelp was found in the north-east Pacific (maximum 32 species) and for fucoids in south-east Australia (maximum 53 species), supporting the hypothesis that these regions were the evolu-tionary sources of global colonization by brown macroalgae. Locations with low spe-cies richness coincided between kelp and f...
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