---
key: mechanic/systemic-worlds--t263
type: mechanic
id: systemic-worlds--t263
lang: en
title: 'Ecology, food chains and environmental recovery'
summary: >-
  An ecosystem connects food availability, population sizes and environmental
  conditions, allowing interventions to propagate.
updatedAt: '2026-10-22'
status: active
url: 'https://gamemechanics.pro/en/knowledge/mechanic/systemic-worlds--t263/'
jsonUrl: >-
  https://gamemechanics.pro/api/v1/knowledge/en/mechanic/systemic-worlds--t263.json
markdownUrl: >-
  https://gamemechanics.pro/content/knowledge/en/mechanic/systemic-worlds--t263.md
aliases:
  - Ecology and food relationships
tags:
  - 'Systemic worlds, randomness and NPC behavior'
  - Mechanics and variants
sourceIds:
  - source-3817d420df0baa92
  - source-f7441d52b2ede78b
sources:
  - id: source-3817d420df0baa92
    title: 'Robert Nystrom: State'
    url: >-
      https://github.com/munificent/game-programming-patterns/blob/master/book/state.markdown
    verifiedAt: null
  - id: source-f7441d52b2ede78b
    title: Bulletstorm
    url: 'https://gamemechanics.org/patterns/feeding-enemies-to-creatures'
    verifiedAt: null
relations:
  - type: uses
    direction: outgoing
    label: Sources in the selection
    key: resource/state-pattern
    title: 'State: Game Programming Patterns'
    url: 'https://gamemechanics.pro/en/resources/#resource-state-pattern'
    jsonUrl: 'https://gamemechanics.pro/api/v1/knowledge/en/resource/state-pattern.json'
    markdownUrl: 'https://gamemechanics.pro/content/knowledge/en/resource/state-pattern.md'
placements:
  - catalogId: systemic-worlds
    id: t263
    title: 'Systemic worlds, randomness and NPC behavior'
    url: 'https://gamemechanics.pro/en/mechanics/systemic-worlds/#t263'
    categoryIds:
      - mechanics
supersededBy: []
attributes:
  preview:
    updatedAt: '2026-10-22'
    title: Ecology and food relationships
    description: >-
      An ecosystem connects food availability, population sizes and
      environmental conditions, allowing interventions to propagate.
    image:
      src: images/mechanics/world-feeding-enemies-to-creatures.webp
      width: 498
      height: 276
      game: Bulletstorm
      sourceUrl: 'https://gamemechanics.org/patterns/feeding-enemies-to-creatures'
      originalUrl: 'https://cdn.gamemechanics.org/webm/bulletstorm_feeder.webm'
      sourceFrameSeconds: 0.6
      credit: >-
        People Can Fly / Epic Games; frame from clip via GameMechanics.org;
        visible source watermark: GRAVITY BOOTS
      rights: >-
        Game imagery © its respective rights holders. Source host:
        GameMechanics.org. Visible source watermarks preserved. All rights
        reserved; excluded from MIT and CC BY 4.0.
      caption: The player sends a target toward a carnivorous plant
      alt: The player sends a target toward a carnivorous plant
      markers:
        - x: 43
          'y': 48
          label: Enemy airborne after the hit
        - x: 45
          'y': 25
          label: Carnivorous plant beside the target
    tips:
      - Show how creature behaviour depends on available food and threats.
    examples:
      - title: Bulletstorm
        url: 'https://gamemechanics.org/patterns/feeding-enemies-to-creatures'
endsAt: null
provenance: >-
  Original bilingual editorial overviews authored for gamemechanics.pro on
  2026-10-20 and reviewed on 2026-10-21. Scenarios are hypothetical design
  examples; prototype checks describe work to perform, not completed playtests.
  Primary sources support the stated techniques and implementation context, not
  every proposed variant.
license: CC-BY-4.0
codeLicense: MIT
attribution: gamemechanics.pro contributors
catalogKey: catalog/systemic-worlds
---
# Ecology, food chains and environmental recovery

id: systemic-worlds--t263
type: mechanic
key: mechanic/systemic-worlds--t263
lang: en
status: active
url: https://gamemechanics.pro/en/knowledge/mechanic/systemic-worlds--t263/

An ecosystem connects food availability, population sizes and environmental conditions, allowing interventions to propagate.

## At a glance

![The player sends a target toward a carnivorous plant](https://gamemechanics.pro/images/mechanics/world-feeding-enemies-to-creatures.webp)

[Bulletstorm](https://gamemechanics.org/patterns/feeding-enemies-to-creatures) · Game imagery © its respective rights holders. Source host: GameMechanics.org. Visible source watermarks preserved. All rights reserved; excluded from MIT and CC BY 4.0.

[Source recording](https://cdn.gamemechanics.org/webm/bulletstorm_feeder.webm), 0.6 s

1. Enemy airborne after the hit
2. Carnivorous plant beside the target

- Show how creature behaviour depends on available food and threats.

- [Bulletstorm](https://gamemechanics.org/patterns/feeding-enemies-to-creatures)

## How it works

An ecosystem connects food availability, population sizes and environmental conditions, allowing interventions to propagate.

## Variants

### Mechanic variants

<a id="t263-variants"></a>

- Predators limit prey populations. <a id="t263-v1"></a>
- Plants recover under suitable conditions. <a id="t263-v2"></a>
- Pollution changes a site's suitability for a species. <a id="t263-v3"></a>
- Recovery starts by removing the damage source. <a id="t263-v4"></a>

## Design example

Cleaning a stream brings back insects, then fish and finally birds that feed on them.

Prototype check: Test long unattended simulation and explain simplifications rather than claiming real ecological accuracy.

## Context and limits

A systemic world applies shared rules to multiple objects so players can predict new combinations from known interactions. Each overview separates player actions, state changes and alternative rules. Examples are hypothetical design scenarios, not claims about a named game. A prototype check states an observable question for the next iteration. Existing detailed references remain separately linked from the direction map.

## Connected materials

- Sources in the selection: [State: Game Programming Patterns](https://gamemechanics.pro/en/resources/#resource-state-pattern) (key: resource/state-pattern)

## Sources and provenance

Original bilingual editorial overviews authored for gamemechanics.pro on 2026-10-20 and reviewed on 2026-10-21. Scenarios are hypothetical design examples; prototype checks describe work to perform, not completed playtests. Primary sources support the stated techniques and implementation context, not every proposed variant.

- [Robert Nystrom: State](https://github.com/munificent/game-programming-patterns/blob/master/book/state.markdown) (id: source-3817d420df0baa92)
- [Bulletstorm](https://gamemechanics.org/patterns/feeding-enemies-to-creatures) (id: source-f7441d52b2ede78b)

CC-BY-4.0 · gamemechanics.pro contributors