Response of Tropical African Macroinvertebrates with Varying Tolerances to Different Levels of Nitrate and Phosphate

Table 2

Number of trials undertaken during static toxicity test.

Specimen	Blanc	Concentration-based experiments								Number of treatments
N. spio	0.0 mg NO3−N/L	0.4 mg NO3−N/L	0.8 mg NO3−N/L	1.2 mg NO3−N/L	1.6 mg NO3−N/L	2.0 mg NO3−N/L	2.4 mg NO3−N/L	2.8 mg NO3−N/L	3.2 mg NO3−N/L	9
	0.0 mg PO4−P/L	0.4 mg PO4−P/L	0.8 mg PO4−P/L	1.2 mg PO4–P/L	1.6 mg PO4−P/L	2.0 mg PO4−P/L	2.4 mg PO4−P/L	2.8 mg PO4−P/L	3.2 mg PO4−P/L	9
B. harrisoni	0.0 mg NO3−N/L	0.8 mg NO3−N/L	1.6 mg NO3−N/L	2.4 mg NO3−N/L	3.2 mg NO3−N/L	4.0 mg NO3−N/L	4.8 mg NO3−N/L	5.6 mg NO3−N/L	6.4 mg NO3−N/L	9
	0.0 mg PO4−P/L	0.8 mg PO4−P/L	1.6 mg PO4−P/L	2.4 mg PO4−P/l	3.2 mg PO4−P/L	4.0 mg PO4−P/L	4.8 mg PO4−P/L	5.6 mg PO4−P/L	6.4 mg PO4−P/L	9
T. spp.	0.0 mg NO3–N/L	2 mg NO3−N/L	4 mg NO3−N/L	8 mg NO3−N/L	16 mg NO3−N/L	24 mg NO3−N/L	32 mg NO3−N/L	64 mg NO3−N/L	128 mg NO3−N/L	9
	0.0 mg PO4−P/L	2 mg PO4−P/L	4 mg PO4−P/L	8 mg PO4−P/L	16 mg PO4−P/L	24 mg PO4−P/L	32 mg PO4−P/L	64 mg PO4−P/L	128 mg PO4−P/L	9
3 specimens	Total number of trials									54