---
title: an ecosystem is a purpose too
canonical_url: https://ensurance.app/guide/an-ecosystem-is-a-purpose-too
markdown_url: https://ensurance.app/guide/an-ecosystem-is-a-purpose-too.md
subtitle: "every wetland, and this wetland — the stock as a cause and as a place"
category: natural-capital
---

# an ecosystem is a purpose too

*every wetland, and this wetland — the stock as a cause and as a place*

The main types of ecosystems are usually split first into land and water. On land: forests, grasslands, shrublands, deserts, and the cold country of tundra and high mountains. In water: rivers and lakes, wetlands, coasts, and the open sea. Finer systems split those again, by climate, soil, and depth, into dozens or hundreds of types. The ensurance protocol keeps a working list of 15, built with reference to established classifications including IUCN's Global Ecosystem Typology, and it calls each one a **stock**: a living system that keeps producing work for as long as it stays in condition.

Picture one of them. At Marble, Colorado, the catalog's account for the Marble Wetlands Preserve describes a 54-acre beaver wetland with Crystal River frontage. The Trust for Land Restoration took it as a gift in 2021, and the Aspen Valley Land Trust holds the conservation easement. That wetland is one inland wetland, in the sense the list uses. It is also one example of a type found in watersheds all over the world.

The wetland already exists and already depends on the river, the snow, and the beavers, whether or not anyone names it. **[Ensurance](https://ensurance.app/?from=guide)** is how the stock you name gets funded to keep working. It is not the wetland.

:::johnson
**a stock can be a cause and a place at once.** Wetlands everywhere is a purpose. One beaver wetland at Marble is a place. Same living system, two legs.

[see the wetland purpose account →](/inland-wetlands.ensurance?from=guide)
:::

## the 15 types of ecosystems, one line each

| ecosystem type | in one line |
|---|---|
| Tropical forests | Warm, wet forests near the equator |
| Temperate forests | Broadleaf and conifer forests of the mid-latitudes, with real seasons |
| Boreal forests | The northern conifer belt, cold and slow-growing, rich in peat |
| Grasslands | Prairie, steppe, and savanna, where grasses and grazers shape the ground |
| Shrublands | Sagebrush, chaparral, and scrub, adapted to drought and fire |
| Inland wetlands | Marshes, swamps, bogs, fens, floodplains, and peatlands between land and water |
| Rivers and lakes | Moving and standing fresh water, and the life along its edges |
| Coastal systems | Mangroves, salt marshes, dunes, reefs, and estuaries where land meets sea |
| Marine systems | The open ocean and the seafloor beyond the coast |
| Polar and alpine | Ice, tundra, and the high country above treeline |
| Desert | Dry lands where water, not cold, sets the limit |
| Subterranean | Caves, aquifers, and the life below ground |
| Cultivated and developed | Farms, orchards, and built land, still living systems |
| Urban open space | Parks, street trees, and green corridors inside cities |
| Rural open space | Working and open land between towns and wild country |

Every one of these has a purpose account under `.ensurance` (for example, [inland-wetlands.ensurance](/inland-wetlands.ensurance?from=guide)). The fuller version, read as a portfolio list, is in [the 15 ecosystem types](/guide/15-ecosystem-types-natural-capital-stocks?from=guide). For the differences inside one type, [marshes, swamps, and potholes are not the same wetland](/guide/marshes-swamps-and-potholes-are-not-the-same-wetland?from=guide).

## a stock and a flow, in two sentences

A **stock** is the living system: the wetland, the forest, the grassland. A **flow** is the work it does, such as water held, floods slowed, or habitat kept, and a stock in condition produces many flows at once (the previous post, [a flow is a purpose](/guide/a-flow-is-a-purpose?from=guide), lists them).

## the same stock on two legs

Here is the idea this post adds. A stock can sit on two legs of the triad at the same time.

As a **purpose**, it is the aim wherever it shows up: wetlands everywhere, kept wet and working. That is `inland-wetlands.ensurance`, a purpose account with a wallet deployed. Its keepers can be anyone who cares about wetlands as a kind of thing, in any watershed.

As a **place**, it is one stretch of ground with a boundary: this wetland, here. That is [marble-wetlands-preserve.avlt](/marble-wetlands-preserve.avlt?from=guide), a place account. Its own description names its keepers: the Trust for Land Restoration took the gift in 2021 to finish cleaning up slag, the Aspen Valley Land Trust holds the conservation easement, and the Town of Marble manages public day use.

Every wetland, and this wetland.

| | purpose: wetlands everywhere | place: this wetland |
|---|---|---|
| Account | `inland-wetlands.ensurance` | `marble-wetlands-preserve.avlt` |
| Leg | Purpose | Place |
| Boundary | None; it follows the type | 54 acres at Marble, Colorado |
| Who keeps it | Anyone who keeps wetlands as a cause | The trusts and the town named on the ground |
| Evidence | Wetland area and condition across many places | The condition of this one 54-acre wetland |
| Wallet on 26 Oct 2026 | Deployed | None yet |

The relation between them runs purpose to place: the purpose is served wherever a place like Marble stays wet. This post does not claim the two accounts are linked onchain today. The relation is real on the ground; drawing it in the protocol is a choice a keeper makes. The first layer of drawn relationships is visible in [explore](/explore?from=guide).

## the stock at three sizes

The wetland stock changes grain without changing shape.

**One wetland.** Marble's 54 acres, a place account, kept by named trusts and a town.

**The wetlands along one river.** The [Roaring Fork watershed account](/roaring-fork-river.basin?from=guide), which takes in the Crystal River, says in its own description that the system holds about 27,500 acres of wetlands. Those are many places, with many owners, along one water system.

**Wetlands everywhere.** The purpose account, with no boundary at all.

**What stays the same:** the living system. A beaver-built wetland at Marble does the same kinds of work as any other inland wetland: holds water, slows floods, shelters life. And the account shape is the same at each size: a name, an address, an aim, and people who sign.

**What changes:** the boundary, the evidence, and who can act. At Marble a person can visit during public day use and see the wetland for themselves. Along the river, the evidence is a map and a count, and the keepers are a patchwork of owners and agencies. At the scale of the type, the evidence is global inventories, and the keepers are anyone, anywhere, who holds wetlands as a cause. You choose the size you can act on. Some people can act on the first; a foundation or a group can act on the third.

## why name the stock as a purpose at all

Because a place account alone answers "where" and a purpose account answers "what for, wherever." A family that loves the Marble wetland may want to keep that one. A foundation that funds wetlands as a class may want to keep the type, wherever the best ground turns out to be. Both are real aims, and they need not compete. Several accounts can serve the same wetland, and none of them speaks for it or replaces the people already keeping it.

There is a value in naming the type, too, that no single place carries. A species, a flow, or a stock that is spread across thousands of properties has no single owner to sign for it. The purpose account gives that spread-out aim one address. What it holds, if anything, is a separate question, and a dollar figure for the wetland is [never its worth](/guide/a-valuation-is-not-the-worth?from=guide).

## where this leads

A stock is a home. The life that lives in it is a purpose too, and it can zoom in further than any ecosystem type: from a species to one population in one creek. That is the next post, [species, subspecies, and the population in one creek](/guide/species-subspecies-population?from=guide).

If you keep a wetland, a forest, or a stretch of grassland and want the type it belongs to named beside it, [tell us which one](/contact?from=guide&topic=ppp-purpose).

## frequently asked questions

### what are the types of ecosystems?

The broad types are forests, grasslands, shrublands, deserts, polar and alpine lands, inland wetlands, rivers and lakes, coastal systems, and marine systems. The ensurance protocol uses a working list of 15, adding subterranean, cultivated and developed, urban open space, and rural open space, and splitting forests into tropical, temperate, and boreal.

### what is the difference between an ecosystem and an ecosystem service?

An ecosystem is the living system, such as a wetland or a forest. An ecosystem service is the work it does that someone uses, such as holding water or slowing a flood. On ensurance the first is called a stock and the second a flow.

### can an ecosystem be both a place and a purpose?

Yes. One wetland with a boundary is a place. Wetlands as a kind of thing, wherever they are, is a purpose. On ensurance, `marble-wetlands-preserve.avlt` is the first and `inland-wetlands.ensurance` is the second: the same stock on two legs.

## the series

1. [what counts as a purpose?](/guide/what-counts-as-a-purpose?from=guide) — read first
2. [a flow is a purpose](/guide/a-flow-is-a-purpose?from=guide)
3. [an ecosystem is a purpose too](/guide/an-ecosystem-is-a-purpose-too?from=guide) — you are here
4. [species, subspecies, and the population in one creek](/guide/species-subspecies-population?from=guide)
5. [some things are kept for no price](/guide/some-things-are-kept-for-no-price?from=guide)
6. [every purpose needs people who keep it](/guide/every-purpose-needs-people-who-keep-it?from=guide)

## the three series

1. [what counts as a place?](/guide/what-counts-as-a-place?from=guide) — place
2. [what counts as a purpose?](/guide/what-counts-as-a-purpose?from=guide) — purpose
3. [who counts as people?](/guide/who-counts-as-people?from=guide) — people
4. [what do you want to ensure?](/guide/what-do-you-want-to-ensure?from=guide) — where the three began