Fragilaria radians (Kützing) Williams & Round (1988: 269)

Fragilaria radians (Kützing) Williams & Round (1988: 269)

Figs 3 View FIGURE 3 : X–AA

Length: 23.7–40.4 µm; width: 2.7–3.2 µm; striae: 18–22 in 10 µm (n = 6)

Teratological form: deformed valve outline, undulated, containing protrusions, or bent apices.

Occurrence: S3, S8.

Ecological characteristics: Cond.: 39.00–40.00 µS cm –1; BOD: 1.19–2.38 mg L− 1; COD: 5.95–13.60 mg L− 1; N-NH 3: 37.80–58.00 µg L− 1; NO 3: 0.34–0.37 mg L− 1; DO: 14.27–14.80 mg L− 1; pH: 6.19–6.26; PO 4 −: 0.004 –0.006 mg L− 1; TP: 0.007 –0.016 mg L− 1; TS: 10.00– 48.00 mg L− 1; Temp.: 17.37–17.90 °C; Turb.: 7.96–10.70; Flow: 0.47–1.16 m 3 s; Average depth: 0.19–0.29 m; Prec.: 9.96 mm.

Metal Concentrations: Co: 23.91–39.39 mg L –1; Cr: 27.33–85.31 mg L –1; Cu: 170.55–264.18 mg L- 1; Mn: 398.50–606.73 mg L –1; Ni: 31.80–73.27 mg L –1; Pb: 31.05–46.56 mg L –1; Zn: 79.00– 172.60 mg L –1.