Some figures emerge with precision, such as the £430m that pollinating insects are calculated to be worth, or the £1.5bn pricetag on inland wetlands, valued so high because they help to produce clean water.
In areas with overlapping CFs from different GW-fed wetlands, values were summed since multiple wetlands are influenced if pumping occurred in that region (SI Figure S23).
The perceived wetland values assessed by the public differed from the observed biophysical values.
We include explanatory variables in the meta-analysis to account for these influences on estimated wetland values.
Although the majority of protected area types were designed to support terrestrial conservation objectives rather than wetland values, our results suggest that the latter were also afforded protection.
By incorporating small wetland values and functions into planning objectives, forest managers can significantly enhance the contribution of extensive young-growth forests to regional conservation of biodiversity.
The study revealed that mean WTP ranged from a one-time contribution of $6.03 to $45.4 according to the estimation technique and the type of wetland valued, and a total value of WTP for South Carolina residents was $3.7 million.
We found that saltmarshes were the most important wetland in terms of covered area and also that socio-economic variables, such as income, are important in explaining wetland values.
Hruby and others (1995) describe the indicator value assessment, a rapid assessment procedure that considers wetland values on a regional scale.
Wetlands have value because their functions have proved to be useful to humans.
