Water Framework Directive Marine Plants Task Team Tools Paper ...

Table 6: Boundaries values for RSL, ESG, Green and Red proportions for
England/Wales/RoI area.
Score
EQR 0 – 0.2 0.2 – 0.4 0.4 – 0.6 0.6 – 0.8 0.8 – 1.0
Bad Poor Moderate Good High
RSL 0­5 5­15 15­25 25­35 35­69
Greens 80­100 25­80 20­25 15­20 0­15
Reds 0­15 15­40 40­45 45­55 55­100
ESG 0­0.2 0.2­0.55 0.55­0.8 0.80­1.0 1.0­1.2
Opportunist 50­100 25­50 15­25 10­15 0­10
Table 7: Boundaries values for RSL, ESG, Green and Red proportions for
Northern Ireland.
Score
0 1 2 3 4
Bad Poor Moderate Good High
RSL 0­3 3­10 10­20 20­34 34­68
Green 80­100 45­80 30­45 20­30 0­20
Red 0­10 10­25 25­35 35­45 45­100
ESG 0­0.2 0.2­0.40 0.40­0.6 0.6­0.80 0.80­1.2
Opportunist 50­100 35­50 25­35 15­25 0­15
A de­shoring factor has also been calculated for the reduced species lists and was
achieved in the same way as for the full species list. The Parameters for a, b and c are
estimated to be:
a = 14.210
b = 4.925
c = 0.108
Therefore for each value of shore description there is a level of species richness that is
to be expected for reference conditions from which a ‘de­shoring factor’ has been
produced. This can be seen in table 8 with the exponential model displayed in Figure
12. This factor was based around an average shore description of 15. The actual level
of species richness can then be compare with the predicted level of species richness
by applying the ‘de­shoring factor’.