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Ammonium and nitrate concentrations of selected burrow compartments
| Location | Mean NH4+ concn (μM) ± SE | NO3− concn (μM) |
|---|---|---|
| Overlying water | 4.15 ± 0.13 | 1.35 |
| Burrow opening | 3.95 ± 0.17 | 1.41 |
| Burrow opening | 4.41 ± 0.00 | 1.82 |
| 4-cm-deep burrow compartment | 4.15 ± 0.17 | 1.20 |
| 8-cm-deep burrow compartment | 5.92 ± 0.35 | 2.19 |
| 9-cm-deep burrow compartment | 8.27 ± 0.24 | 0.00 |
