Table 1 Averages (±SE) of median grain size, mud content (fraction < 63 μm), water content, particulate organic carbon (POC) and nitrogen (PON) concentrations, C:N ratio, phosphorus content (P) and pigment characteristics (chl a and derivatives) in Limfjorden and the Oosterschelde at the control site (= reference site) and the mussel site
| Â | Limfjorden | Oosterschelde | ||||
|---|---|---|---|---|---|---|
Sand (25) | Mussel (25) | Sand (10) | Mussel (10) | |||
Average | nm-Sites (9) | m-Sites (16) | ||||
Median grain size (μm) | 152 ± 0.34 | 116 ± 1.64 | 122 ± 1.75 | 113 ± 1.96 | 285 ± 7.56 | 102 ± 16.20 |
Mud content (%) | 0 ± 0.00 | 13 ± 1.22 | 7.85 ± 0.54 | 16.34 ± 1.38 | 0 ± 0.00 | 41 ± 5.66 |
Water content (%) | 19.4 ± 2.2 | 26.0 ± 4.8 | 23. 3 ± 0.6 | 27.4 ± 1.3 | 14.5 ± 0.38 | 24.1 ± 1.2 |
POC (%) | 0.20 ± 0.00 | 0.52 ± 0.06 | 0.27 ± 0.02 | 0.66 ± 0.07 | 0.04 ± 0.00 | 0.78 ± 0.11 |
PON (%) | 0.023 ± 0.00 | 0.064 ± 0.01 | 0.03 ± 0.00 | 0.08 ± 0.01 | 0.006 ± 0.001 | 0.095 ± 0.01 |
C:N ratio | 10.07 ± 0.24 | 9.82 ± 0.16 | 10.08 ± 0.30 | 9.68 ± 0.19 | 8.22 ± 0.18 | 9.56 ± 0.07 |
P (mg P g−1) | 0.14 ± 0.00 | 0.25 ± 0.01 | 0.20 ± 0.15 | 0.28 ± 0.01 | 0.07 ± 0.00 | 0.34 ± 0.03 |
Chl a (μg g−1) | 11.02 ± 0.48 | 10.04 ± 1.05 | 4.60 ± 0.21 | 13.10 ± 1.01 | 0.33 ± 0.05 | 13.52 ± 2.37 |
Phaeophytin a (μg g−1) | 2.31 ± 0.23 | 8.72 ± 1.25 | 2.51 ± 0.19 | 12.22 ± 1.28 | 0.05 ± 0.01 | 14.83 ± 2.65 |
Phaeophytin a:Chl a | 0.21 | 0.87 | 0.55 | 0.93 | 0.14 | 1.10 |
Phaeophorbide a (μg g−1) | 0.27 ± 0.09 | 6.0 ± 1.17 | 0.88 ± 0.13 | 8.87 ± 1.37 | 0.02 ± 0.007 | 7.66 ± 1.99 |
Phaeophorbide a:Chl a | 0.03 | 0.60 | 0.19 | 0.68 | 0.07 | 0.57 |