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Limited knowledge exists about the sessile species found in wave exposed subtidal environments of southeastern Pacific shores, including the temporal patterns of colonization, growth, succession, and the potential problems they pose to human industries, including oceanic aquaculture and renewable wave energy. Filling this information gap is urgent considering the increased interest to exploit these environments. We conducted a 23mo long experimental study on the coast of central Chile to characterize biofouling colonization, rates of accumulation and succession patterns at two different depths and different substrates. Throughout the study, we recorded 62 species, 36 of which were sessile. Biomass accumulation rates were among the highest recorded, with significantly higher and more seasonal rates above than below the thermocline. Slightly but significantly higher biomass was observed in ceramic tiles …