recreation, aesthetic appreciation and biodiversity provided by wetland in Staffordshire can be valued at £2.87 million annually. Note that additional ecosystem services provided by wetland in Staffordshire have been calculated applying a different methodology. This includes the services wild food, non-food products as well as wild species diversity. Note also that this is the totalised marginal value rather than the totalised average value. The marginal value describes a marginal loss (extent) of the total area of habitat. For the purposes of this study, ecosystem services are valued assuming a 10% loss of wetland which yields a total annual value of £287.000. If we assume a 100% loss of wetlands in Staffordshire, the total average annual value of ecosystem services provided by wetland would equal the much higher figure of £8.42 million, though there is no realistic policy scenario where all wetland in Staffordshire would be destroyed (see also Section 1.2). In the next step, the value attributable to each ecosystem service can be approximated. This step is not necessary but has been chosen to maintain consistency within this study. By setting every variable standing for an ecosystem service to equal zero and viewing the difference in the sum, an estimate can be made of the attributable value for each ecosystem service. For the sensitivity analysis, uncertainties regarding the estimations as well as the scientific evidence, have been considered. For the ecosystem services of fresh water supply, water quality regulation, recreation, aesthetic appreciation and biodiversity, a range of 30 per cent has been applied. As mentioned previously in Section 4.3, uncertainties for flood regulation are generally higher because they are more context-specific. Taking this circumstance into account, a range of 50 per cent has been applied for this ecosystem service. The findings have not been outlined in this appendix, but in the referring Sections of the main report.
recreation, aesthetic appreciation and biodiversity provided by wetland in Staffordshire can be valued at £2.87 million annually. Note that additional ecosystem services provided by wetland in Staffordshire have been calculated applying a different methodology. This includes the services wild food, non-food products as well as wild species diversity. Note also that this is the totalised marginal value rather than the totalised average value. The marginal value describes a marginal loss (extent) of the total area of habitat. For the purposes of this study, ecosystem services are valued assuming a 10% loss of wetland which yields a total annual value of £287.000. If we assume a 100% loss of wetlands in Staffordshire, the total average annual value of ecosystem services provided by wetland would equal the much higher figure of £8.42 million, though there is no realistic policy scenario where all wetland in Staffordshire would be destroyed (see also Section 1.2). In the next step, the value attributable to each ecosystem service can be approximated. This step is not necessary but has been chosen to maintain consistency within this study. By setting every variable standing for an ecosystem service to equal zero and viewing the difference in the sum, an estimate can be made of the attributable value for each ecosystem service. For the sensitivity analysis, uncertainties regarding the estimations as well as the scientific evidence, have been considered. For the ecosystem services of fresh water supply, water quality regulation, recreation, aesthetic appreciation and biodiversity, a range of 30 per cent has been applied. As mentioned previously in Section 4.3, uncertainties for flood regulation are generally higher because they are more context-specific. Taking this circumstance into account, a range of 50 per cent has been applied for this ecosystem service. The findings have not been outlined in this appendix, but in the referring Sections of the main report.
Staffordshire%20Ecosystem%20Assessment%20Report%202014.docx