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(a) Relationship between s.d. of δ13C and s.d. of δ15N. Non-significant regression line is shown (hatched line; n.s.). Relationship between (b) Mean δ13C and s.d. of δ13C and (c) Mean δ15N and s.d. of δ15N. When Candona sp. is removed from the analysis (black line) s.d. of δ15N increases significantly with mean δ15N. Non-significant regression lines are shown (hatched line; n.s.).
