Table 4.

Criteria employed to determine the environmental condition for each sample on the basis of the additive integration of its colour graded spots (RBU-Rep 1994)

Number of warning “lights” over 8	Ecosystem health condition
4 Yellow	Good (green)
2 Orange
3 Yellow + 1 orange
1 Red
5 Yellow	Tolerable (yellow)
3 Orange
4 Yellow + 1 orange
3 Yellow + 2 orange
2 Yellow + 2 orange
3 Yellow + 1 red
8 Yellow	Delicate (orange)
4 Orange
3 Orange + 2 yellow
2 Orange + 4 yellow
1 Orange + 6 yellow
2 Orange + 1 red
2 Red
Red (LP)	Bad (red)
6 Orange
3 Red
Red (LP) + 4 yellow
Red (LP) + 2 orange
Red (LP) + 1 red
2 Red + 3 orange
2 Red + 6 yellow