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Frequency of the number of articles according to the abiotic factors identified for Porphyra and Pyropia species. Abiotic factors: salinity (S), wavelength (WL), light intensity (LI), nutrient composition (NC), algal density (AD), desiccation (D), CO2 (CO), heavy metals (HM), photoperiod (PP), pH (PH), and temperature (T).
