Fig. 7

Bivariate plot of δ¹⁸O from May shrimp ponds and May/July tidal channels showing DOC increasing with enrichment of isotopes in shrimp ponds. Spearman correlation coefficients (DOC is non-normally distributed) of 0.92 between δ¹⁸O and DOC in shrimp ponds (p = 0.00047) and 0.095 in tidal channels (p = 0.84)