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Fig. 3 | Environmental Sciences Europe

Fig. 3

From: The importance of sediments in ecological quality assessment of stream headwaters: embryotoxicity along the Nidda River and its tributaries in Central Hesse, Germany

Fig. 3

Developmental delays at 24 hpf for the additional sampling sites. Plot a shows results from upstream (N1) and downstream (N2.1–N2.4) of the industrial discharger at River Nidda. Plot b depicts results from upstream of (H2a oh), downstream of (H2a uh1–uh4) and directly from the efflux pipe (H2a-DE) of a class-IV WWTP at River Horloff. Plots c and d illustrate results from upstream (H1) and downstream (H2–H2.3) of the class-I WWTPs (c) and a more detailed resolution of the last class-I WWTP (d). Asterisks mark significant differences to control treatments; Likelihood ratio χ2, Fisher’s exact test (p < 0.05), correction with sequential Bonferroni–Holm method p < α

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