Study
Organisms as ecosystem engineers
Jones, Clive G.; Lawton, John H.; Shachak, Moshe
Oikos, 1994
Defines ecosystem engineers as organisms that modulate the availability of resources to other species by causing physical state changes in living or non-living materials, and distinguishes autogenic engineers, which do so through their own structures, from allogenic ones, which transform materials around them.
- Studied in
- Animalia, Plantae
- Sample size
- conceptual synthesis with examples across taxa
A large class of ecological effects operates through physical modification of the environment rather than through consumption, and these effects are distinct in mechanism from trophic ones.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Physical habitat modification deserves recognition as a distinct ecological process rather than being folded into trophic interactions.
How NatureHQ reads it
The record that separates two words this site keeps having to prise apart. A keystone species has its effect by eating something. An ecosystem engineer has its effect by changing the physical world — building, burrowing, damming, or simply being a structure. A beaver can be both, and being one does not make it the other. The autogenic and allogenic split is also more useful than it sounds: a coral is habitat because of its own body, while a beaver is not the dam.
- A conceptual paper; how much of any given community is structured by engineering rather than by trophic effects is a separate empirical question.
- The definition is broad enough that almost any organism qualifies to some degree, which the authors acknowledge.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Ecosystem engineers
An ecosystem engineer has its effect by changing physical structure — damming, burrowing, building, or simply being one. A keystone species has its effect by eating something. A beaver is both; the words are not.
Earthworms
In a garden, earthworms improve the soil. In a northern forest that has had none since the ice retreated, the same worms eat the leaf layer the understorey depends on. Same animal, same behaviour, opposite verdict.
Published by: Wiley journalsPublished in a Wiley journal.
Checked against Crossref on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-04.