A contribution towards improving the applicability of the Myriophyllum aquaticum sediment contact test

Environmental Sciences Europe

Table 3 Inhibition values (%) based on RGR and other M. aquaticum growth parameters in different formulations of artificial sediments

Parameter	Artificial sediments
Parameter	A1	A2	A3	A4	A5
Inhibition based on growth parameters (I%)
RGR	44.6*	45.3*	− 31.5*	− 16	− 5
wFWd10	36.8*	33.6	− 39.9	− 15.6	1.03
sFW	58.3	45.1	− 91.6*	− 22.4	− 21
sL	25.4	23.6	− 58.2*	− 9	− 13.5
rFW	11	42.2	− 84.8*	− 82.5*	2.6
rL	21.6	− 4.7	− 101.8*	− 70.1*	13.4
M. aquaticum growth inhibition I% _RGR above or below the toxicity threshold according to [13]	↑	↑	↓	↓	↓
Sand, %	78	69	47	30	20
Silt and clay, %	20	20	47	64	74
Org. matter, %	1	10	5	5	5

A1–A5 artificial sediments with different organic matter, sand silt and clay content. All artificial samples contained 1% CaCO₃
↑Above the toxicity threshold ↓below the toxicity threshold
RGR, relative growth rate; wFW, whorl fresh weight at d10; sFW, shoot fresh weight; sL, shoot length; rFW, root fresh weight; rL, root length
*Significantly different from the corresponding test control (one-way ANOVA followed by t test, p ≤ 0.05)