Variables | Units | Country | |||
---|---|---|---|---|---|
Guadalupe | Martinique | Sardinia | |||
Spring sites | |||||
Chute du Carbet | La Lise | Sucrerie | San Giovanni Su Anzu | ||
Temperature | °C | 44.9 | 44.9 | 26.4 | 29.3–30 |
Discharge | Is- 1 | 0.489–0.651 | |||
Mean water depth | cm | 6–7.3 | |||
pH | 6.51 | 7.33 | 7.92 | 7.26–7.30 | |
Alkalinity | meq l-1 | 3.8–4.7 | |||
Conductivity | μS cm-1 | 1558 | 570–590 | ||
Dissolved Oxygen | 7.07 | 7.2–8.7 | |||
Oxygen saturation | % saturation | 89.2 | 95–114 | ||
BOD5 | mg O2 l-1 | 1.0–3.3 | |||
Cl | 368 | 27.5 | 42.5–46.1 | ||
Total hardness | mg CaCO3 l-1 | 235–235 | |||
Reactive phosphorus | 16–24 | ||||
Total phosphorus | μg P l-1 | 37–78 | |||
N-NO2- | μg N l–1 | 4–6 | |||
N-NO3 | 200 | 1140 | 2448–2932 | ||
N-NH4 | 3–8 | ||||
Total nitrogen | 3743–6244 | ||||
Reactive silica | mg Si l–1 | 110 | 72 | 7.53–8.65 | |
Suspended solids | mg l–1 | 0–1.8 | |||
Br- | < D.L.0.4 | ||||
Ca2+ | 188 | 13.4 | 44–44 | ||
F | <D.L.–0.1 | ||||
Fe2+ | 0.04–0.04 | ||||
HCO3- | 125 | 132 | 254.4–274.5 | ||
K+ | 24 | 3.89 | 1.7–2.2 | ||
Mg2 + | 64.9 | 4.84 | 30.4–30.9 | ||
Mn2 + | n.d. | 0.011 | 0.04–0.05 | ||
Na+ | 116.2 | 41.9 | 26–27.3 | ||
SO42 - | 303 | 5.69 | 8.0–9.8 | ||
% |
10–50% | < 10% | 55 | 0.9–10.8 | |
Substrate | cob | cob/mac/sed |
Valve outline | elliptic | linear-elliptic |
Ends | capitate | sub-capitate |
Raphe | straight, filiform | |
Striae | radiate, more spaced in the middle | slightly radiate, more spaced in the middle |
Central area | sub-quadratic | |
Length (μm) | 7.2–8.0 | 6.0–8.0 |
Width (μm) | 2.5–3.0 | 2.5 |
Striae/10 μm | 29–30 | 26–28 |
Type locality | hot-salt spring | thermal well |