Eunotia yberai Frenguelli (1933: 446)

Eunotia yberai Frenguelli (1933: 446)

Figs 5 View FIGURE 5 : N–P

Length: 55.7–67.2 µm; width: 7.3–9.5 µm; striae: 6–9 in 10 µm (n = 5)

Teratological form: deformed valve outline, with depression in the ventral region of the valve. Some individuals presented valves more curved ventrally. Unusual striae pattern.

Occurrence: S1, S4.

Ecological characteristics: Cond.: 58.00–78.00 mS cm –1; BOD: 1.10–5.50 mg L− 1; COD: 1.00– 18.10mg L− 1; N-NH: 200 µg L− 1; NO: − 3 3 2.10–14.30 mg L− 1; DO: 6.17–19.50 mg L− 1; pH: 6.09–6.75; PO: 0.004 –0.046 mg L− 1; TP: 0.009 –0.943 mg L− 1; TS: 32.00–104.00 4 mg L− 1; Temp.: 18.01–20.93 °C; Turb.: 2.81–6.38; Flow: 0.10–0.45 m 3 s; Average depth: 0.04–0.12 m; Prec.: 2.39–11.17 mm.

Metal concentrations: Co: 23.67–44.91 mg L –1; Cr: 23.67–83.01 mg L –1; Cu: 210.07–273.01 mg L- 1; Mn: 349.80–523.81 mg L –1; Ni: 28.58–58.71 mg L –1; Pb: 35.17–61.04 mg L –1; Zn: 81.88–239.18 mg L –1.