Gomphonema naviculoides W. Smith (1856: 98)

Gomphonema naviculoides W. Smith (1856: 98)

Fig. 6 View FIGURE 6 : AU

Length: 39.6–51.4 µm; width: 8.7–11 µm; striae: 11–14 in 10 µm (n = 3)

Teratological form: unusual striae pattern, strongly radiate in the middle portion of the valve.

Occurrence: S3.

Ecological characteristics: Cond.: 52.00–53.00 µS cm –1; BOD: 0.89–3.27 mg L− 1; COD: 7.23–11.05 mg L− 1; N-NH: 316–378 mg L− 1; 3 − 1 − 1 − − 1 − 1 NO: 0.37 mg L; DO: 11.42–14.62 mg L; pH: 5.79–6.19; PO: 0.005 –0.008 mg L; TP: 0.009 –0.017 mg L; TS: 21.00–66.00 3 4 mg L− 1; Temp.: 17.37–17.50 °C; Turb.: 7.03–10.70; Flow: 0.66–0.78 m 3 s; Average depth: 0.22–0.34 m; Prec.: 9.96 mm.

Metal concentrations: Co: 23.91–33.57 mg L –1; Cr: 27.33–78.86 mg L –1; Cu: 197.55–235.49 mg L- 1; Mn: 398.50–444.52 mg L –1; Ni: 31.80–69.89 mg L –1; Pb: 35.58–46.56 mg L –1; Zn: 93.81–167.31 mg L –1.