Seednote
Living system
Ecological referents that change while they remain identifiable
An ecological referent — a soil, a watershed, an ecosystem — that stays identifiable while its boundaries and condition change.
RSM ID Learning Center2 min read
A living system is an ecological referent: a soil body, a stream network, a wetland, a watershed, an ecosystem. What distinguishes it from most other referents is that its description never stops changing. Its extent is redrawn as models improve, its condition shifts with seasons and decades, and the institutions that steward or regulate it come and go. RSM ID treats it like any other resource — one RID, kept apart from every description — so that the changes can be recorded as history rather than as a succession of new identities.
The words "not necessarily" matter. Most change to a living system is change to its description: a new delineation, a revised classification, a new steward. Some change may raise a genuine identity question — a dam that divides a catchment, two wetlands that merge — and deciding whether a new referent has come into being is a governance decision, not an automatic consequence of new geometry.
Example
The Cedar Creek watershed has the illustrative RID 451.4ZFNMDBX5YHB833N (Cedar Creek). A watershed council and a county water office each publish a delineation of it in their own Semantic Spaces, citing that RID; the two disagree at the eastern divide. When stewardship passes to a joint authority in 2033, a new stewardship relationship is recorded. The watershed remains one referent throughout, described differently by different parties.
A common misconception
“A living system can be named with a living-system kind.” RSM models may describe Cedar Creek as rsm:LivingSystem, but that is a semantic class, not a registered naming kind. The minimum kind profile of Document 08 has no such kind, so a watershed's registered name, where it has one, uses the place kind, and how other living systems should be named is an open registry question.
Related concepts
A living system is one kind of referent. The Journal Place Is Not a Coordinate follows Cedar Creek through competing delineations, and the Fieldnote A watershed crosses boundaries explains why overlap never decides identity. Communities that steward a living system are a separate referent.
In the specification
Resources include ecological entities: Document 08 §2.1. Multiple bioregions, watersheds, and jurisdictions: §8.3. The watershed example: §8.4 and §13.3. The kind registry: §18.3.