Eunotia subarcuatoides Alles, Nörpel & Lange-Bertalot (1991: 188)

Eunotia subarcuatoides Alles, Nörpel & Lange-Bertalot (1991: 188)

Figs 4 View FIGURE 4 : W–X

Length: 11.3–15.9 µm; width: 2.9–3.8 µm; striae: 18–20 in 10 µm (n = 3)

Teratological form: deformed valve outline, undulated in the ventral side of the valve.

Occurrence: S3, S8.

Ecological characteristics: Cond.: 44.00–53.00 µS cm –1; BOD: 1.49–5.66 mg L− 1; COD: 8.08–16.67 mg L− 1; N-NH: 200–378 µg L− 1; − 3 NO: 0.37–5.46 mg L− 1; DO: 10.60–14.57 mg L− 1; pH: 6.19–6.58; PO: 0.006 –0.030 mg L− 1; TP: 0.006 –0.010 mg L− 1; TS: 38.00– 3 4 44.00 mg L− 1; Temp.: 17.35–21.57 °C; Turb.: 10.70–24.40; Flow: 0.47–6.34 m 3 s; Average depth: 0.19–0.37 m; Prec.: 3.48–9.96 mm.

Metal concentrations: Co: 23.91–60.76 mg L –1; Cr: 27.33–88.85 mg L –1; Cu: 163.45–241.67 mg L- 1; Mn: 398.50–557.50 mg L –1; Ni: 31.80–69.89 mg L –1; Pb: 35.58–48.63 mg L –1; Zn: 83.42–173.12 mg L –1.