Ecosystem: Canonical Domain Analysis

Status: Canonical reference. Full 12-step analysis of ecosystem — the community domain (Cm in SSA terms) of the biology arrangement. Describes what organisms DO COLLECTIVELY when interacting in environmental context. Position in the topology: Community domain. Cm primitive of the biology arrangement's SSA. Connected downward to organism architecture via the organism-to-ecosystem bridge (separate analysis); receives constraint from environment context (Cx) via context edges; feeds back to environment via niche-construction edges. Selection (Se) emerges within ecosystem dynamics. Parallel to: Digital ecosystem {Pd, Tf, Cy, Dv, In, Rg, Sp, Tp, Ct} (entity arrangement, 9 primitives). Cultural ecosystem (cognitive arrangement). All three are community-level surface domains describing what their respective organism/agent populations DO collectively. Reference (not basis for copying): v1_revision/v1_biology_domain_analysis/bio_v1/exploration-environment-and-ecosystem.md §3-4 contains the v1 ecosystem analysis. Environment context analysis is at analysis-environment-context.md.

Step 1 — Information Gathering

1.1 What we're analyzing

The ecosystem is the biotic community structure that emerges when organisms with specific capabilities interact with each other within an environmental context. It's biology's community domain — what organisms DO COLLECTIVELY, as opposed to what they do individually (organism architecture).

Each organism brings its organism architecture capabilities. The ecosystem is what happens when MANY organisms with VARIED capabilities interact. No single organism IS the ecosystem, just as no single cell IS the organism. Ecosystem is a higher-order phenomenon.

1.2 Sources

Ecology textbooks — Begon, Townsend & Harper; Odum, Fundamentals of Ecology
Trophic ecology — Lindeman (1942) trophic dynamics; Hairston-Smith-Slobodkin (1960) green world hypothesis
Network ecology — Bascompte & Jordano, Mutualistic Networks
Disturbance ecology — Pickett & White
Metacommunity theory — Leibold et al. (2004)
Niche theory — Hutchinson, Concluding Remarks (1957); Chase & Leibold

1.3 The landscape

Ecosystem	Character
Hydrothermal vent	Chemosynthetic base, low diversity, geological disturbance
Tropical reef	Photosynthetic base, very high diversity, complex food web
Tropical rainforest	High productivity, very high diversity, tight nutrient cycling
Temperate forest	Moderate productivity, seasonal, periodic disturbance
Savanna	High productivity, fire-driven, mid diversity
Arctic tundra	Low productivity, low diversity, slow cycling
Microbial mat	Two-level food chain, simple, often extreme conditions
Estuary	Cross-ecosystem subsidies, variable salinity, transition zone

Step 2 — Landscape Analysis

2.1 What recurs across all ecosystems

Energy capture — every ecosystem has primary producers
Energy transfer — every ecosystem moves energy through trophic levels
Matter cycling — every ecosystem recycles nutrients
Multiple species — every ecosystem has more than one species (otherwise it's a culture)
Species interactions — every ecosystem has competition, predation, mutualism, etc.
Regulation — every ecosystem exhibits some form of community-level control
Spatial organization — every ecosystem has spatial structure
Temporal dynamics — every ecosystem changes over time
Cross-boundary exchange — every ecosystem exchanges with neighbors

Step 1b — Domain Type Declaration

Community (ecosystem) domain. Predicted properties from R11:

Filter: tight (~7-20%) — BFS-confirmed at 7.23% (37/512), at the tight end (the earlier "~12-16%" was an estimate, superseded)
Resource-flow core triad — confirmed: {Pd, Cs, Cy}
~9 primitives — confirmed at 9

SSA mapping: Cm primitive of biology arrangement. Selection (Se) operates within ecosystem dynamics — natural selection arises from regulation (Rg), interaction (In), and reproduction differentials. Se isn't a separate primitive but an emergent property of the ecosystem at certain partial-level configurations.

Step 3/3b — Primitives and Partial Levels

3.1 Nine primitives

#	Primitive	What it describes
1	Production (Pd)	Energy capture — primary productivity, autotrophy/chemotrophy
2	Consumption (Cs)	Energy transfer between trophic levels — herbivory, predation, decomposition
3	Cycling (Cy)	Biogeochemical cycling of matter (C, N, P, H₂O, S)
4	Diversity (Dv)	Species richness, functional diversity, genetic diversity
5	Interaction (In)	Species-species relationships — competition, mutualism, predation
6	Regulation (Rg)	Top-down and bottom-up control — trophic cascades, keystone effects
7	Spatial (Sp)	Patchiness, zonation, corridors, metacommunity structure
8	Temporal (Tp)	Succession, seasonal cycling, disturbance response, stability
9	Connectivity (Ct)	Exchange between patches/communities — dispersal, migration, gene flow

3.2 Stability under 3/3b iteration

Splitting candidates rejected:

Diversity split into Species + Functional + Genetic. All three are aspects of the same primitive at different scales; partial levels capture them.
Cycling split per element. C, N, P, H₂O cycles share the same structural role (matter recirculation); kept as one primitive with multi-pathway partial levels.

Collapsing candidates rejected:

Niche. Decomposes into Dv (niche packing) + In (niche boundaries) + Sp (spatial niche). Niche is a concept emerging from multiple primitives, not a primitive.
Population dynamics. Captured by Rg (density dependence, carrying capacity) and In (predator-prey).
Fitness. Emergent from interaction of all primitives with organism architecture; not a structural primitive.
Evolution. Operates ON the ecosystem over time but is not an ecosystem-level primitive — it's a meta-process spanning biology lattice + ecosystem dynamics.

Verdict: 9 primitives stable.

3.3 Partial levels (compressed)

Primitive	Levels	Phase transition	Significance
Pd	6 (none → chemo → low photo → moderate → high → multi-pathway)	Pd1 → Pd2 (photosynthesis)	Local energy → global
Cs	6 (none → 1 transfer → 3 levels → web → detrital integrated → cross-eco subsidies)	Cs2 → Cs3 (food web)	Chains → networks
Cy	6 (none → simple → multi-pathway → tight closed → managed → biosphere)	Cy1 → Cy2 (multi-pathway)	One pathway → resilient cycling
Dv	6 (none → low → mod-no-redundancy → high → very high → max)	Dv2 → Dv3 (functional redundancy)	Single → resilient functions
In	6 (none → pairwise → multiple → mutualistic networks → coevolution → engineering)	In2 → In3 (mutualistic networks)	Antagonistic → integrated
Rg	6 (none → density-dep → predator-prey → cascade → multi-pathway → self-organized)	Rg2 → Rg3 (trophic cascade)	Within-level → across-level
Sp	6 (homogeneous → zonation → patchy → nested → edge effects → dynamic mosaic)	Sp1 → Sp2 (patchiness)	Ordered → complex
Tp	6 (static → seasonal → succession → disturbance cycles → alternative states → evol-eco)	Tp2 → Tp3 (disturbance integration)	Progressive → cyclical
Ct	6 (isolated → passive → active → subsidized → corridor → global)	Ct1 → Ct2 (active exchange)	Passive transport → metacommunity

Detailed partial levels with examples in bio_v1/exploration-environment-and-ecosystem.md §3.3.

Total raw positions: 6⁹ = 10,077,696 (same as organism architecture).

Steps 4–6 — Dependencies, Pairs, Load Classification

4.1 Primitive-presence dependencies

Cs → Pd            consumption requires producers
Cy → Pd, Cs        cycling requires production and decomposition
Dv → Pd            diversity requires productive base (species-energy hypothesis)
In → Dv            interactions require multiple species
Rg → Cs, In        regulation operates through consumption (top-down) and interactions
Sp → Pd            spatial structure requires organisms
Tp → Pd, Rg        temporal dynamics require productive base + regulatory mechanisms
Ct → Sp, Dv        connectivity requires spatial separation and population diversity

DAG with Pd as universal hub:

Pd (hub)                                  
 │                                        
 ├── Cs ── Cy                             
 │    │                                   
 │    └── Rg                              
 ├── Dv ── In ── Rg                       
 │                │                       
 │                └── Tp                  
 ├── Sp ── Ct                             
 │                                        
 └── Tp

Pd is the universal hub. Parallel to D (Data) in app architecture, Mo (Morphology) in organism arch, En (Energy) in environment context. Substrate-providing primitives anchor surface and community domains.

4.2 Conditional partial-level dependencies

Constraint	Reasoning
Dep(Cs ≥ 3, Dv ≥ 2)	Complex food webs require multiple consumer species
Dep(Rg ≥ 3, Cs ≥ 3, In ≥ 2)	Trophic cascades require complex food web and interaction diversity
Dep(In ≥ 3, Dv ≥ 3)	Mutualistic networks require functional redundancy (multiple partners)
Dep(Cy ≥ 3, Pd ≥ 3)	Tight closed cycling requires high producer density (rainforest model)
Dep(Tp ≥ 3, Rg ≥ 3)	Disturbance-integrated cycles require trophic cascade-level regulation
Dep(Ct ≥ 3, Sp ≥ 2)	Subsidized exchange requires patchy landscape structure

4.3 Coherent sub-lattice

BFS-computed: 37 / 512 = 7.23% coherent (the earlier "~60-80 ≈ 12-16%" was an estimate, now superseded). Tighter than organism architecture (15%) and biology substrate (12.5%) — the production-required dependency cascade (Cs/Cy/Dv/Sp/Tp all ← Pd, then In←Dv, Rg←Cs∧In, Ct←Sp∧Dv) collapses the lattice hard. Cross-arrangement finding: this is exactly the digital-ecosystem (entity arrangement) value (37/512 = 7.23%) — ecosystem-class community domains appear to converge on a characteristic ~7% filter regardless of substrate (flagged for the cross-domain consistency review).

5.1 Pair enumeration

C(9, 2) = 36 pairs.

6.1 Load classification (compressed)

Heavy (≈10): Pd-Cs (food chain base), Pd-Dv (energy-diversity), Cs-Cy (decomposition flow), Cs-Rg (top-down control), In-Dv (network diversity), In-Rg (interaction-mediated regulation), Sp-Dv (spatial niche), Tp-Rg (dynamic regulation), Pd-Sp (productive spatial), Ct-Dv (metacommunity).

Medium (≈12): Pd-Cy, Cy-In, Dv-Rg, Rg-Sp, Sp-Tp, Cs-Sp, Sp-Ct, Tp-Ct, Pd-Tp, Pd-Ct, Cs-In, Pd-In.

Light (≈12): Cy-Sp, Cy-Tp, Cy-Ct, Cs-Tp, Cs-Ct, Dv-Tp, Dv-Sp, Rg-Tp, Rg-Ct, In-Sp, In-Tp, In-Ct.

Negligible (≈2): Cy-Ct (very indirect), Dv-Ct (mediated by Sp).

Approximate distribution: 10/12/12/2 (28% heavy). Slightly lower than organism architecture (33% heavy) — reflects ecosystem's even broader scope.

6.2 Anchor analysis

Pd (Production): primary anchor — in dependencies of all other primitives, in 4+ heavy pairs.
Cs (Consumption): secondary anchor — in 3+ heavy pairs (Pd-Cs, Cs-Cy, Cs-Rg).
Dv (Diversity): tertiary anchor — in 3+ heavy pairs (Pd-Dv, In-Dv, Sp-Dv).

Pd-Cs is the primary anchor pair — energy flow from producers to consumers is the ecosystem's structural backbone.

Steps 7–9 — Lattice, Compositions, Walks

7.1 Core triad

{Pd, Cs, Cy} — production + consumption + cycling. The ecosystem's "metabolism": energy capture + transfer + matter recirculation.

Without any vertex: no ecosystem.

No Pd → nothing for the system to be made of
No Cs → energy stuck at producer level (no food web)
No Cy → nutrient depletion → collapse

This is the biotic analog of the organism's {Mo, Me, Dv} — the minimal triad defining the domain.

7.2 Cross-domain comparison

Domain	Core triad	Defining flow
Biology ecosystem	{Pd, Cs, Cy}	Energy + matter through community
Digital ecosystem	{Pd, Tf, Cy}	Production + traffic + cycle (entity arrangement)
Cultural ecosystem	(cognitive arrangement)	—

R11's prediction: ecosystem core triads handle resource flow. Confirmed across analyzed arrangements.

7.3 Named compositions

Triangles:

Triangle	Name	Emergent property
Pd-Cs-Cy	Ecosystem core	Energy and matter flow
Cs-In-Rg	Trophic regulation	Food-web structure with cascade dynamics
Pd-Dv-In	Diverse productive community	Niche-packed productive system
Sp-Ct-Dv	Metacommunity	Spatially structured connected diversity
Tp-Rg-Cs	Dynamic regulation	Temporal stability + trophic cascade
In-Dv-Sp	Spatial network	Diverse interactions in spatial context

Step 10 — Emergent Property Map

Property	Required composition	Required regime	Prediction
Productive community	Pd-Cs	Pd ≥ 2, Cs ≥ 1	Energy flow from producers to consumers
Food web	Pd-Cs-Cy	Cs ≥ 3	Multi-trophic-level energy distribution
Resilience	Dv ≥ 3	Dv ≥ 3 (functional redundancy)	Loss of one species buffered by others
Trophic cascade	Cs-In-Rg	Rg ≥ 3	Apex predator changes propagate through food web
Coevolution	In ≥ 4	In ≥ 4	Reciprocal evolutionary change between species
Ecosystem engineering	In ≥ 5, Sp ≥ 2	In ≥ 5	Single species restructuring community
Metacommunity	Ct ≥ 2, Sp ≥ 2	Multi-patch	Source-sink dynamics
Stability / persistence	Rg ≥ 4, Dv ≥ 3, Tp ≥ 3	Multi-pathway control	Community composition robust to perturbation
Alternative stable states	Tp ≥ 4	Tp ≥ 4	State shifts (coral ↔ macroalgae)

Steps 11–12 — Structural Patterns and Literature Alignment

11.1 Cross-domain patterns

Tight ecosystem filter — and a cross-arrangement convergence. Biology ecosystem is 7.23% (37/512, BFS) — tighter than organism architecture (15%) and biology substrate (12.5%), i.e. the tightest domain in the biology chain, not a mirror of them. The stronger and more interesting pattern: this value is identical to the digital ecosystem (entity arrangement, also 37/512 = 7.23%). Ecosystem-class community (Cm) domains appear to converge on a characteristic ~7% filter regardless of substrate, driven by a universal "production/primary-source-required" dependency cascade. (Flagged for the cross-domain consistency review — a candidate structural finding.)

6→9 expansion. Substrate-to-surface (6→9) and surface-to-community (9→9) patterns. The community domain doesn't expand further — same primitive count as surface.

Hub at the energy primitive. Pd in ecosystem, Mo in organism arch, D in app arch — all "the structural carrier." For ecosystems, energy production IS the structural carrier (everything else needs it).

Niche construction (Cm → Cx feedback). Ecosystems modify their environment context. Beavers create wetlands, corals create reefs, soil microbes generate atmospheric oxygen (over geological time). This is the classical Sf/Cm → Cx feedback edge identified in analysis-environment-context.md and the methodology's SSA framework.

11.2 Selection (Se) emerges from ecosystem dynamics

Natural selection — the SSA's Se primitive — is not a separate primitive in the ecosystem domain. It EMERGES from:

Differential reproduction (organism-level Rp, biology-level G)
Regulation (Rg) determining which lineages persist
Interaction (In) creating selection pressure
Resource limits (Pd capacity) forcing competition

Se is a property of the ecosystem at sufficient partial-level configuration: Se is meaningful when Pd ≥ 2 (resource limits exist), Cs ≥ 2 (consumption pressure), In ≥ 2 (multiple interaction types), and Rg ≥ 1 (some regulatory dynamics). All ecosystems above the minimal-life threshold exhibit Se.

This is the ecosystem analog of how the entity system's "social/market selection" emerges from digital ecosystem regulation — Se is community-level selection rather than a separate domain.

11.3 Literature alignment

Lindeman trophic dynamics (1942) — energy through trophic levels = Pd → Cs flow at multiple Cs levels
Hairston-Smith-Slobodkin (1960) green world — top-down regulation = Rg ≥ 3 (trophic cascade)
Hutchinson niche concept — niche emerges from Dv + In + Sp combination
Bascompte mutualistic networks — In ≥ 3 (mutualistic networks) at high Dv
Pickett-White disturbance ecology — Tp ≥ 3 (disturbance integration)
Leibold metacommunity theory — Ct ≥ 2 + Sp ≥ 2 dynamics

Manifestation Landscape

Ecosystem	Pd	Cs	Cy	Dv	In	Rg	Sp	Tp	Ct
Hydrothermal vent	1	2	1	1	2	2	1	0	1
Microbial mat	1	1	1	1	1	1	1	1	0
Tropical reef	4	3	4	4	4	3	3	3	3
Tropical rainforest	4	3	3	4	4	3	4	2	2
Temperate forest	3	3	2	3	3	3	3	3	2
Savanna	3	3	2	3	3	4	2	3	2
Arctic tundra	2	2	1	2	2	2	1	3	1
Estuary	3	4	3	3	3	3	3	3	4

Attractors

Chemosynthetic minimal (Pd1, Cs1-2, Cy1, low everything) — vents, deep subsurface
Simple grazer (Pd2-3, Cs2, Cy1-2) — early-succession, simple aquatic
Mature terrestrial (Pd3-4, Cs3, Cy2-3, Dv3-4, complex regulation) — temperate and tropical forests
Reef / high-diversity (Pd4, Cs3-4, Cy3-4, Dv4-Full, In4) — coral reefs
Disturbance-driven (Pd3, Cs2-3, Tp3-4) — fire-prone shrublands, floodplain

Walls vs fences (analyst judgment per methodology §6.3)

Transition	Tentative character	Reasoning
Chemosynthetic → photosynthetic (Pd1 → Pd2)	Wall	Required oxygen-producing photosynthesis evolution; ~3.5 Gya event
Simple chain → food web (Cs2 → Cs3)	Fence	Multiple times independently; just adding species and links
Add mutualistic networks (In2 → In3)	Fence	Independent evolution of pollination, mycorrhiza, etc.
Stable → disturbance-integrated (Tp2 → Tp3)	Fence	Communities adapt to local disturbance regimes via natural selection

Summary

Domain: Ecosystem (Cm primitive of biology arrangement).

Domain kind: Community (collective surface) domain.

Primitive set: {Pd, Cs, Cy, Dv, In, Rg, Sp, Tp, Ct}.

Filter stringency: 7.23% (37/512, BFS-computed — tightest in the biology chain; identical to the digital ecosystem, an ecosystem-class convergence; the earlier "~12-16%" estimate is superseded).

Activation (data/domains/ecosystem.v1.json, all discriminating; one-home): Productive-community→[Pd,Cs] pair; Food-web→{Pd,Cs,Cy} core triad (directly in Step-10, no override — #36 pattern); Resilience→Dv3 partial-level (flagged PT, single-driver); Trophic-cascade→{Cs,In,Rg} triad; Coevolution→In.emergent_phases band [4,4]; Ecosystem-engineering→[In,Sp] pair; Metacommunity→{Sp,Ct,Dv} triad; Stability/persistence→new {Rg,Dv,Tp} triad (Step-10-requires-construct, chemistry-#33 precedent); Alternative-stable-states→Tp.emergent_phases band [4,4]; full-9 added. The §7.3 firm triangles ({Pd,Dv,In},{Tp,Rg,Cs},{In,Dv,Sp}) and the unflagged-in-Step-10 PTs (Pd2,Cs3,Cy2,In3,Rg3,Sp2,Tp3,Ct2) get no emergent (non-over-flag — uniform with chemistry #31 / organism-architecture #36).

Pair distribution: ~10 heavy / 12 medium / 12 light / 2 negligible. ~28% heavy.

Core triad: {Pd, Cs, Cy} — production + consumption + cycling = ecosystem metabolism.

Primary anchor: Pd (Production). Anchor pair: Pd-Cs.

Phase transitions (key): Pd1 → Pd2 (photosynthesis); Cs2 → Cs3 (food web); Cy1 → Cy2 (multi-pathway); Dv2 → Dv3 (functional redundancy); In2 → In3 (mutualistic networks); Rg2 → Rg3 (trophic cascade); Sp1 → Sp2 (patchiness); Tp2 → Tp3 (disturbance integration); Ct1 → Ct2 (active exchange).

SSA mapping: Cm primitive of biology arrangement. Se (selection) emerges within the ecosystem rather than as a separate primitive.

Cross-references:

analysis-organism-architecture.md — Sf below
analysis-environment-context.md — Cx (constraint root); feedback via niche construction
analysis-organism-to-ecosystem-bridge.md (next) — bridge between Sf and Cm

Open work:

Full coherent sub-lattice enumeration (computational)
Selection mechanism (Se) explicit modeling within Rg + In dynamics
Cross-ecosystem coupling (estuaries, migration corridors) — Ct at high partial levels

Referenced by the model

Cited as a source by 1 model record (browse the model census):

ecosystem — domain biology/sc1