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δ13C values (mean ± SD) of bulk in particulate organic matter (POM) and two mesozooplankton size fractions ((a) 100–300 µm; (b) ≥300 µm), and in individual amino acids only in mesozooplankton from the surface water (orange symbols), the winter water (blue symbols), and the bottom water (gray symbols) at the Eastern Gotland Basin in July 2014 (circles) and 2015 (diamonds). See notes in Figure 3
