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Inorganic and organic (a) carbon and (b) nitrogen content in surface and burrow wall sediments with varying pH, measured after a 14-week period. Error bars represent standard error; for surface sediment, n = 4; for burrow sediment, n = 5 at pHT 8.10; n = 8 at pHT 7.90; n = 7 at pHT 7.70; n = 4 at pHT 7.35; n = 3 at pHT 6.80. *Standard error not determined because n = 2 (see the electronic supplementary material).
