332
E. Neverova-Dziopak
Table 14.6
Numerical indexes for trophic state assessment with reference values for different trophic state [on the base of 7, 34, 38, 39, 40, 41]
Index
Numerical value
Author
Ultraoligotrophic Oligotrophic Mesotrophic Eutrophic Hypertrophic
TSI—Trophic State Index
<30
30–40
40–50
50–60
70–80
R. Carlson (American Lakes)
TRIX—Trophic Index
2.0
2–4
4–5
6–8
–
R. Vollenweider (Mediterranean, Black
and Caspian Seas)
EI—Eutrophication Index
–
0.04–0.38
0.37
0.87
0.87–1.51
L. Primpas, Tsirtsis G. (Saronic Bay)
TLI—Trophic Level Index
2
2–3
3–4
4–5
5
N. Burns (lakes of New Zealand)
NIM—Nutrient Index Method –
0–30
31–60
61–100
>100
National Chinese Center for
Environmental Monitoring
ITS—Index of Trophic State
6.0–6.6
6.7–7.3
7.4–8.0
>8.0
–
E. Neverova-Dziopak (Gulf of Finland
and low-mineralized waters)