Eunotia meridiana Metzeltin & Lange-Bertalot (1998: 67)

Eunotia meridiana Metzeltin & Lange-Bertalot (1998: 67)

Figs 4 View FIGURE 4 : AV–AX

Length: 17–22.4 µm; width: 4.4–4.9 µm; striae: 15–16 in 10 µm (n = 4).

Teratological form: deformed valve outline, with protrusion or constriction near the apices.

Occurrence: S3, S8.

Ecological characteristics: Cond.: 47.00–52.00 µS cm –1; BOD: 0.89–5.05 mg L− 1; COD: 10.20–11.05 mg L− 1; N-NH: 363–448 µg L− 1; 3 − 1 − 1 − − 1 − 1 NO: 0.37 mg L; DO: 11.15–14.62 mg L; pH: 6.04–6.47; PO: 0.005 –0.006 mg L; TP: 0.009 mg L; TS: 21.00–49.00 mg 3 4 L− 1; Temp.: 17.35–17.40 °C; Turb.: 7.79–9.25; Flow: 0.47–1.32 m 3 s; Average depth: 0.19–0.33 m; Prec.: 9.96 mm.

Metal concentrations: Co: 23.73–60.76 mg L –1; Cr: 27.33–88.85 mg L –1; Cu: 160.64–264.18 mg L- 1; Mn: 398.50–606.73 mg L –1; Ni: 27.57–73.27 mg L –1; Pb: 31.05–66.21 mg L –1; Zn: 78.97–173.12 mg L –1.