Ecosystem services are the benefits people obtain from ecosystems; damaging the system can reduce several benefits at once.
Provisioning services supply products such as fish, timber and fresh water. Regulating services moderate processes, for example floodwater storage and water purification. Cultural services include recreation, spiritual meaning and learning. Supporting services, such as nutrient cycling and soil formation, maintain the conditions that allow other services to continue.
What people regard as a useful supply changes across time and space. A plant may have little commercial demand in one place but provide valued food or medicine elsewhere. New technology may allow a previously unused biological material to be processed into a useful product. Demand and the ability to use it change its resource value; the material did not suddenly appear.
Habitat destruction removes the organisms and physical structures that supply services. Clearing wetland vegetation may reduce habitat for fish and space for storing floodwater. Pollution can harm organisms or make water unsafe, reducing supply even where the habitat remains visible.
An invasive species is a non-native species that establishes and spreads with harmful effects. It may outcompete native organisms or alter food webs, reducing services people rely on. Not every introduced species becomes invasive. Protecting one marketed product while ignoring these relationships can damage the wider ecosystem.
Step by step
Name the service
State the benefit people receive, not just the habitat name.
Explain the process
Connect the ecosystem feature to that benefit.
Follow the change
Explain how demand, technology or damage changes access to the benefit.
Worked example: A wetland conversion
Imagine a wetland is filled for warehouses. The new buildings may produce income, but fish habitat, water storage and a place for recreation are lost. A complete comparison considers those different services, who used them and whether replacement measures provide the same functions.
Watch out for this
A service has no value if nobody pays for it.
Flood regulation and cultural meaning may matter greatly even without a market price.
Check your understanding
A new plant-processing method makes a previously unused species commercially useful. What changed most directly?
- Technology changed its value as a provisioning resource.
- All supporting ecosystem services became unnecessary.
- The species became non-renewable.