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

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The application of the shore description is not as straight forward as the rest of the metric components as it only acts as a correction for the level of species richness and not the proportions of green, red, and opportunist or the ESG ratio. Its inclusion into the metric as a single component bares too much weighting for the system, therefore it only needs to be incorporated into the final species richness value. Using data from reference or near reference conditions a graph was plotted to show the level of correlation between species richness and shore description (Figure 8) displaying a nonlinear relationship between the two variables. This relationship can be described by an exponentialtype model of the form: RICHNESS = a + b exp(cSHORE ) where a, b and c are parameters to be estimated from the data. Using least squares, these parameters were estimated to be: a = 16.543 b = 7.150 c = 0.122 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 3. 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’. An example is given below: The site of Bugel Bay in Northumberland has a shore description of 10 and a species richness of 51. The expected level of species richness for this shore description is 40.73 with a deshoring factor of 1.50. Therefore the final value for species richness is: RICHNESS = 51 x 1.50 = 76.50 This is the final value to be input to the metric system
Table 3: Calculation of ‘deshoring’ factor for all possible shore description values based on the predicted levels of species richness Species Richness 120 100 80 60 40 20 0 Shore Predicted Deshoring Description Richness factor 5 29.69 2.06 6 31.40 1.94 7 33.32 1.83 8 35.50 1.72 9 37.96 1.61 10 40.73 1.50 11 43.87 1.39 12 47.41 1.29 13 51.42 1.19 14 55.94 1.09 15 61.04 1.00 16 66.81 0.91 17 73.33 0.83 18 80.69 0.76 19 89.01 0.69 20 98.40 0.62 6 8 10 12 14 16 18 20 Shore Description Figure 8: Exponential model for the relationship between shore description and species richness.
Page 1 and 2: Water Framework Directive Marine Pl
Page 3 and 4: dates will result in a larger speci
Page 5 and 6: Figure 2: Sites included within the
Page 7 and 8: fauna and flora and exposed shores
Page 9 and 10: Table 1: Field sampling sheet to re
Page 11 and 12: These different community factors c
Page 13: All datasets were tested for normal
Page 17 and 18: Development of a Reduced Species Li
Page 19 and 20: certain species are only present on
Page 21 and 22: Figure 11: Map of the UK and Republ
Page 23 and 24: Table 4: Species lists for each of
Page 25 and 26: Table 6: Boundaries values for RSL,
Page 27 and 28: The final metric system works on a
Page 29 and 30: Table 10: Final quality status and
Page 31 and 32: EQR Value EQR Value 1.00 0.80 0.60
Page 33 and 34: EQR Value 1.00 0.80 0.60 0.40 0.20

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

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