Achnanthidium minutissimum (Kützing) Czarnecki (1994: 157)

Achnanthidium minutissimum (Kützing) Czarnecki (1994: 157)

Figs 7 View FIGURE 7 : X–AC

Length: 6.1–14.7 μm; width: 2.5–3.4 µm (n = 38)

Teratological form: deformed valve outline, usually with constriction or bent apices. Sometimes with strong constriction in the median portion of the valve. Sigmoid shape, or unidentified.

Occurrence: S1, S2, S3, S4, S6, S7.

Ecological characteristics: Cond.: 25.00–91.00 µS cm –1; BOD: 0.77–9.90 mg L− 1; COD: 1.00– 24.32 mg L− 1; N-NH: 200–540 µg L− 1; 3 − 1 − 1 − − 1 − 1 NO: 0.37–13.60 mg L; DO: 6.54–19.35 mg L; pH: 5.01–6.92; PO: 0.005 –0.050 mg L; TP: 0.005 –0.922 mg L; TS: 3 4 19.00–174.00 mg L− 1; Temp.: 17.40–23.56 °C; Turb.: 0.06–37.50; Flow: 0.10–5.09 m 3 s; Average depth: 0.04–0.41 m; Prec.: 2.37–11.17 mm.

Metal concentrations: Co: 16.73–58.28 mg L –1; Cr: 21.98–85.31 mg L –1; Cu: 160.64–292.30 mg L –1; Mn: 347.86–745.82 mg L –1; Ni: 27.57–85.63 mg L –1; Pb: 33.49–66.21 mg L –1; Zn: 73.15–412.52 mg L –1.