Nitzschia austriaca

Földi, Éva Ács Angéla, Wetzel, Carlos E., Vad, Csaba F., Kiss, Keve T., Dobosy, Péter, Trábert, Zsuzsa, Grigorszky, István, Engloner, Attila & Ector, Luc, 2017, Nitzschia austriaca Hustedt: a characteristic diatom of Hungarian inland saline waters including a morphological comparison with the type material, Phytotaxa 308 (1), pp. 54-65 : 60-61

Autecology of N. austriaca

Altogether 48 ponds were sampled, but here we give the physico-chemical variables for 30 ponds where Nitzschia austriaca occurred and 12 where it was dominant ( Table 3). These 30 ponds were alkaline (pH 7.8–9), their trophic conditions varied from eutrophic to hypertrophic (TP 41.7–1693.6 μg L- 1) according to OECD (1982). On average salinity was 2.9 g L- 1 and electrical conductivity was 3.8 mS cm-1.

TSS and TP were retained in the multiple logistic regression model with the lowest AIC value (χ 2 = 25.5, df = 2, p<0.001), being the most important variables predicting the occurrence of the species. TSS and TP, along with conductivity and pH were significantly higher in ponds where N. austriaca occurred ( Fig. 27 ). Moreover these ponds were more shallow, turbid and larger than the others and the DIN concentration was lower ( Table 3).

Figures

FIGURE 27. Box plots showing variation in chemical variables, (a) conductivity (mS cm-1), (b) pH, (c) TSS (mg L-1) and (d) TP (mg L-1) values of ponds, in which N. austriaca is present (1) or absent (0).