Ulnaria ulna (Nitzsch) Compère (2001: 100)

Ulnaria ulna (Nitzsch) Compère (2001: 100)

Figs 3 View FIGURE 3 : AX–AZ

Length: 78.7–212.4 µm; width: 6–8.4 µm; striae: 8–11 in 10 µm (n = 18)

Teratological form: deformed valve outline, undulated or with strong constriction in the median portion of the valve. Slight alteration in the striae pattern.

Occurrence: S1, S2, S3, S6, S8.

Ecological characteristics: Cond.: 38.00–78.00 µS cm –1; BOD: 0.1–9.9 mg L− 1; COD: 1.22–24.32mg L− 1; N-NH: 8–316 µg L− 1; NO: 3 3 − 1 − 1 − − 1 − 1 0.34–17.20 mg L; DO: 5.84–22.80 mg L; pH: 5.31–7.09; PO: 0.005 –0.030 mg L; TP: 0.005–0.82 mg L; TS: 10.00–72.00 4 mg L− 1; Temp.: 17.37–23.24 °C; Turb.: 1.93–10.7; Flow: 0.027–4.17 m 3 s; Average depth: 0.02–0.29 m; Prec.: 2.36–9.98 mm.

Metal concentrations: Co: 18.10–55.52 mg L –1; Cr: 24.51–85.01 mg L –1; Cu: 170.45–245.83 mg L- 1; Mn: 345.77–639.87 mg L –1; Ni: 32.41–78.27 mg L –1; Pb: 24.07–52.76 mg L –1; Zn: 123.32–412.52 mg L –1.