What are ecosystem services?
An ecosystem is a living community (plants, animals, microbes) together with its soil, water and air. Ecosystem services are the useful things that this community does or gives to people, usually without any payment.
Think of a forest. It gives wood, cools the air, holds rain in the soil, hosts birds that eat pests and gives a quiet place to walk. Each of these is a service.
Scientists group the services into four types. Learn the four names first, then the examples.
The four types of services
- Provisioning (things we take): food, fresh water, timber, fibre, fuel wood, medicines from plants.
- Regulating (nature controls things): climate and CO2 control by forests and oceans, flood control by wetlands and mangroves, water cleaning, pollination by bees and bats, pest control by birds.
- Supporting (the base that other services need): soil formation, nutrient cycling, photosynthesis, the water cycle, habitat for species.
- Cultural (benefits for mind and society): beauty, recreation, tourism, learning, sacred groves, art and traditions.
Supporting services work slowly and people do not notice them directly. The other three depend on them.
The value of ecosystem services
Because nature gives these services free, people often forget they have value. Value can be counted in different ways:
- Direct use value: what we take, such as fish, timber or crops.
- Indirect use value: benefits we get without taking anything, such as clean water, flood control or pollination.
- Replacement cost: how much we would pay to do the same job by machine, for example a water filter plant or hand pollination.
- Non-use value: the worth we give to knowing a forest or species exists, and to leaving it for children.
Some services cannot be replaced at any price, such as a stable climate or the ozone layer. Counting the value helps leaders choose to protect nature.
Losing services and protecting them
Cutting forests, draining wetlands, over-fishing and pollution reduce services. One loss causes others: with less forest there is less rain absorbed, so floods rise, soil washes away and rivers get dirty.
Ways to protect services: keep forests and wetlands, plant trees along rivers, farm in ways that keep soil healthy, protect pollinators, and pay people (for example farmers upstream) who look after ecosystems. This idea is called payment for ecosystem services.
Try it: in the 3D, move the forest slider from 100 to 0 and write down how the water, flood risk and repair cost change.
Key formulas and definitions
- Services (4 types): Provisioning, Regulating, Supporting, Cultural
- Replacement cost = cost of the machine or work needed to do the same job as nature
- Value of loss ≈ cost of replacing the service + harm that cannot be replaced
- Loss of service = area lost × value of service per unit area
Worked examples
1. Sort into the four service types: honey, flood control by mangroves, a sacred grove, soil formation.
Honey = provisioning. Flood control by mangroves = regulating. Sacred grove = cultural. Soil formation = supporting.
2. A town gets clean water from a forest. A filter plant would cost 50 crore rupees. Protecting the forest costs 5 crore. How much does the town save by protecting the forest?
Saving = 50 - 5 = 45 crore rupees. This is the replacement cost idea: protecting the ecosystem is cheaper than replacing its service.
3. Bees are lost from an orchard. Farmers hire workers to pollinate flowers by hand. Which type of service was lost, and is the replacement as good?
Pollination is a regulating service. Hand pollination can work on a small scale, but it is slow and costly, so it is a poor replacement for a large farm.
4. A hill is cleared of trees. Name two services lost and one effect on the village below.
Lost: flood control (regulating) and soil protection (supporting). Effect: more floods and muddy, dirty river water for the village.
Common mistakes
- Thinking ecosystem services means only things we take (food, wood). Many services, like flood control and pollination, take nothing away.
- Mixing up supporting and regulating services. Supporting services are the base (soil making, nutrient cycling); regulating services control conditions (floods, climate, water quality).
- Saying nature services are worth nothing because they are free. They are free to us, but replacing them costs a lot.
- Believing every lost service can be bought back with money. Climate stability and species that are gone cannot be replaced.