TABLE 1.
Site water column and sediment characteristicsa
| Parameter | Impacted |
Unimpacted |
||
|---|---|---|---|---|
| HL | SR | SM | VM | |
| Water | ||||
| Temp (°C) | 18.1 ± 4.3 | 16.2 ± 3.1 | 16.1 ± 3.4 | 15.3 ± 2.6 |
| Salinity (psu) | 26.8 ± 10.0 | 17.4 ± 10.9 | 29.8 ± 7.5 | 29.9 ± 6.6 |
| NO3− concn (μM) | 166.5 ± 323.3 | 602.9 ± 602.6 | 41.2 ± 75.7 | 8.13b ± 8.3 |
| NH4+ concn (μM) | 11.8 ± 11.8 | 12.9 ± 11.7 | 8.6 ± 7.5 | 12.6b ± 27.6 |
| PO43− concn (μM) | 6.2 ± 6.2 | 11.4 ± 9.7 | 4.3 ± 4.2 | 1.38b ± 0.8 |
| Dissolved O2 concn (mg/liter) | 8.0 ± 3.0 | 8.8 ± 3.1 | 7.7 ± 2.3 | 7.7b ± 2.5 |
| Dissolved O2 (% saturated) | 101.8 ± 38.1 | 95.9 ± 25.0 | 90.4 ± 21.9 | 96.3b ± 37.2 |
| Turbidity (NTUc) | 22.5 ± 26.3 | 44.7 ± 60.9 | 10.9 ± 15.0 | |
| pH | 8.2 ± 0.6 | 8.2 ± 0.5 | 8.1 ± 0.5 | 8.2 ± 0.4 |
| No. of samples | 97 | 110 | 109 | 104 (16b) |
| Sediment | ||||
| Organic N (%) | 0.20 ± 0.13 | 0.20 ± 0.10 | 0.26 ± 0.07 | 0.15 ± 0.07 |
| Organic C (%) | 1.81 ± 1.21 | 1.86 ± 0.85 | 3.17 ± 0.93 | 1.67 ± 0.96 |
| C/N (atomic) | 11.4 ± 2.7 | 11.1 ± 1.6 | 14.4 ± 1.8 | 12.2 ± 3.6 |
| δ15N (‰ vs N2) | 6.9 ± 1.9 | 7.1 ± 2.4 | 4.4 ± 1.5 | 3.8 ± 2.4 |
| δ13C (‰ vs VPDBd) | −24.1 ± 0.7 | −25.6 ± 0.9 | −25.3 ± 0.7 | −24.6 ± 0.8 |
| Porositye (%) | 37.2 ± 0.5 | 58.9 ± 0.2 | 47.1 ± 0.7 | 36.9 ± 2.3 |
| Specific density (g/ml) | 1.65 ± 0.02 | 1.42 ± 0.00 | 1.35 ± 0.01 | 1.61 ± 0.07 |
a
Data are from the Elkhorn Slough National Estuarine Research Reserve (NERR) Water Quality Database (www.nerr.gov), unless otherwise noted.
b
From field data collected at the Moss Landing Wildlife Area (VM), near site 1 of the Elkhorn Slough NERR Water Quality Monitoring Database.
c
NTU, nephelometric turbidity unit.
d
VPDB, Vienna Pee Dee Belemnite.
e
Measured as water loss upon drying.