Table 3 Relation between fluxes and nutrient concentrations Ammonium and nitrite+nitrate concentrations (μmol L-1) in the column, canopy and pore waters in the P. oceanica meadow of the Revellata Bay at 10 m depth (mean ± standard deviation; number of sample into brackets); correlation coefficient (r2) between the concentration gradient at the water-sediment interface (canopy and pore-water) and the fluxes (from table 2) at this interface.
From: Posidonia oceanica meadow: a low nutrient high chlorophyll (LNHC) system?
Column water | Canopy water | Pore water | r2 | |
|---|---|---|---|---|
NH 4 + | ||||
February 1997 | 0.10 ± 0.10 (3) | ≤ 0.05 (21) | 3.5 ± 5.0 (22) | 0.62 |
June 1997 | 0.05 ± 0.03 (5) | 0.07 ± 0.04 (16) | 3.7 ± 3.5 (51) | |
October 1997 | 0.14 ± 0.09 (7) | 0.15 ± 0.12 (14) | 2.8 ± 2.1 (10) | |
June 1999 | 0.10 ± 0.06 (15) | 0.50 ± 0.50 (16) | 1.3 ± 2.6 (10) | |
NO 2 +NO 3 | ||||
February 1997 | 0.07 ± 0.03 (3) | 0.07 ± 0.04 (21) | 0.8 ± 2.1 (22) | 0.90 |
June 1997 | 0.15 ± 0.04 (3) | 0.18 ± 0.04 (16) | 0.2 ± 0.4 (51) | |
October 1997 | 0.18 ± 0.09 (7) | 0.09 ± 0.04 (14) | 0.7 ± 0.7 (10) | |
June 1999 | 0.05 ± 0.03 (15) | 0.19 ± 0.09 (16) | 0.2 ± 0.2 (10) |