Fragilaria pectinalis (O.F.Müller) Lyngbye (1819: 185)

Fragilaria pectinalis (O.F.Müller) Lyngbye (1819: 185)

Figs 3 View FIGURE 3 : AE–AH

Length: 20–34 µm; width: 2.9–3.6 µm; striae: 15–17 in 10 µm (n = 11)

Teratological form: deformed valve outline, undulated.

Occurrence: S3.

Ecological characteristics: Cond.: 39.00–40.00 µS cm –1; BOD: 0.89–2.38 mg L− 1; COD: 8.08–13.60 mg L− 1; N-NH 3: 323–378 µg L− 1; NO 3: 0.34–0.37 mg L− 1; DO: 14.62–14.80 mg L− 1; pH: 6.04–6.26; PO 4 −: 0.005 –0.006 mg L− 1; TP: 0.009 –0.016 mg L− 1; TS: 10.00–38.00 mg L− 1; Temp.: 17.37–17.68 °C; Turb.: 9.25–10.70; Flow: 0.47–0.62 m 3 s; Average depth: 0.23–0.31 m; Prec.: 9.96 mm.

Metal Concentrations: Co: 23.91–33.57 mg L –1; Cr: 27.33–78.86 mg L –1; Cu: 197.55–235.49 mg L- 1; Mn: 398.50–444.52 mg L –1; Ni: 31.80–69.89 mg L –1; Pb: 35.58–46.56 mg L –1; Zn: 93.81–167.31 mg L –1.