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Carbon stable isotope variation and exponential model for P. pararubra, Protocruzia labiate, Strombidium sulcatum, and Uronemella filificum fed with Chaetoceros calcitrans (Chaeto) and Isochrysis galbana (Isochrysis). Black and gray circles are the mean of carbon stable isotope values (δ13C) for ciliates and foods, respectively. Vertical lines are ± SD. Black and blue dashed lines indicate the fitting curve and 95% confidence, respectively.
