Fig. 6From: Linking biological toxicity and the spectral characteristics of contamination in seriously polluted urban riversBar graph of correlations between luminescent bacteria 502 acute toxicity and sediment pore water (SDPW) physico-chemical properties. *P < 0.05; **P < 0.01. The olive dotted lines were set at correlation coefficient values of 1 and − 1, which means maximum positive and negative correlations, respectivelyBack to article page