|Our approach to assessing economic benefits of
invasive species treatment relies on characterizing and quantifying the
ecosystem services that people derive from natural systems. |
Ecosystem services are the beneficial outcomes that people receive from natural features and functions and they include a broad range of use and non-use values.
Use values are those that generally require access or proximity to the site such as recreation, aesthetic/spiritual enjoyment.
Non-use values are those that people hold for just knowing an ecosystem or its elements exist, often because people want to maintain the option to use the system or wish to preserve it for future generations.
the risk assessment framework, invasive species are evaluated for the
changes they are likely to produce in site or landscape
features, such as a change in diversity of vegetation. These
site/landscape changes are
then evaluated for their potential to affect ecosystem functions
or processes such as providing nesting habitat for birds.
Functional changes are evaluated for their effects
on ecosystem services, such as birdwatching opportunities.
As a final step, changes in ecosystem services are evaluated in
terms of how they change human well-being.|