Ecosystem: Concept & Definitions
30 Ontological Micro-Realms · Natural vs Artificial, Terrestrial vs Aquatic & Boundary Organization
The 30 Ontological Nodes of Realm 13
Ultra-Crisp 2-to-5-Word Architectural Portals
Tansley's 1935 Coinage
- Arthur George Tansley
- Coined term Ecosystem
- Fundamental unit of-nature
- Integrates organism-complex and-environment
Biocenosis + Biotope
- Biocenosis living community
- Biotope physical habitat-frame
- Inseparable interacting complex
- Energy-matter exchange system
Historical Synonyms
- Forbes 1887 Microcosm
- Thienemann 1939 Biosystem
- Sukachev 1942 Biogeocenosis
- Friederichs 1930 Holocoen
Odum's Systems Definition
- Eugene Odum 1971
- Any area of-nature
- Trophic structure energy-flow
- Biotic-abiotic material cycles
Open Thermodynamic System
- Open to energy-and-matter
- Input environment +A
- Output environment −A
- Dissipative low-entropy structure
Ecosystem Scale Spectrum
- Micro-ecosystem water droplet
- Meso-ecosystem pond forest
- Macro-ecosystem ocean basin
- Mega-ecosystem planetary biosphere
Natural Ecosystems
- Self-sustaining without human-aid
- High genetic diversity
- Closed internal nutrient-loops
- Spontaneous homeostatic regulation
Solar vs Subsidized
- Odum energy classification
- Un-subsidized solar-powered oceans-forests
- Naturally-subsidized tidal estuaries
- Fuel-subsidized industrial cities
Artificial Ecosystems
- Human-engineered and maintained
- Simplified linear food-chains
- Requires external energy-subsidies
- Low internal resilience
Agroecosystems (Croplands)
- Paddy wheat sugarcane-fields
- Monoculture genetic uniformity
- High net harvestable-yield
- Fertilizer irrigation pesticide-inputs
Urban Techno-Ecosystems
- Heterotrophic R>>P metabolism
- Fossil-fuel powered cities
- Imports food water-materials
- Exports concentrated waste-heat
Aquaria & Space CELSS
- Aquariums and terrariums
- Biosphere-2 closed experiment
- Spacecraft bioregenerative life-support
- Chlorella oxygen-recycling cabins
Natural vs Artificial
- High vs low-diversity
- Self-regulated vs human-controlled
- Cyclic vs leaky-nutrients
- Evolutionary vs economic-goal
Terrestrial Ecosystems
- Land-based lithosphere systems
- Water and temperature-limited
- High structural support-tissue
- Soil pedosphere nutrient-bank
Major Terrestrial Types
- Forests tropical-to-boreal
- Grasslands savanna-steppe-prairie
- Hot and cold-deserts
- Arctic and alpine-tundra
Aquatic Ecosystems
- Water-medium hydrosphere systems
- Light and dissolved-oxygen-limited
- High thermal-buffering stability
- Salinity classification axis
Lentic vs Lotic Freshwater
- Freshwater <0.5 ppt-salinity
- Lentic standing lakes-ponds
- Lotic running rivers-streams
- Wetland palustrine marshes-swamps
Brackish & Marine Systems
- Brackish 0.5–35 ppt-estuaries
- Mangroves lagoons backwaters
- Marine ≥35 ppt-oceans
- Coral-reefs upwelling-zones abyssal
Terrestrial vs Aquatic
- Large rooted vs-microscopic-producers
- Upright vs inverted-biomass-pyramids
- Detritus-dominant vs grazing-dominant
- Desiccation vs hypoxia-stress
Ecosystem Boundaries
- Rarely hermetically sealed
- Physical lake-shoreline borders
- Investigator-defined functional boundaries
- Gradient transition zones
Watershed Boundary Unit
- Bormann and Likens-1967
- Topographic ridge-line divide
- Weir gauges water-nutrient-flux
- Gold-standard ecosystem boundary
Autochthonous vs Allochthonous
- Autochthonous internal photosynthesis
- Allochthonous imported organic-matter
- Headwater stream leaf-fall
- Cross-boundary material flux
Meta-Ecosystems & Subsidies
- Michel Loreau 2003-concept
- Spatially coupled ecosystems
- Marine-to-land guano-salmon subsidies
- Saharan dust-to-Amazon phosphorus
Cave & Ephemeral Systems
- Subterranean karst caves
- Zero-sunlight bat-guano dependent
- Phytotelmata pitcher-plant tanks
- Vernal temporary rain-pools
Chemosynthetic Ecosystems
- Abyssal hydrothermal black-smokers
- Cold methane seeps
- Sulfur-oxidizing bacteria producers
- Riftia giant tubeworms
Ecosystem Organization
- Dual architectural framework
- Static morphological arrangement
- Dynamic physiological processes
- Coupled space-time machinery
Structural Organization
- Species composition and-diversity
- Vertical-horizontal spatial stratification
- Trophic level organization
- Standing crop and-state
Functional Organization
- 1. Primary-secondary productivity
- 2. Detritus decomposition
- 3. Unidirectional energy-flow
- 4. Biogeochemical nutrient-cycling
Standing Crop vs State
- Standing crop: living-biomass
- Dry weight per-unit-area
- Standing state: inorganic-nutrients
- N P Ca in-soil-water
Cybernetic Self-Regulation
- Decentralized information network
- Homeorhesis trajectory stability
- Redundant trophic pathways
- Bridge to Realm-14
Core Ontological Distinctions
1. Standing Crop vs. Standing StateStanding Crop is the total amount of living organic matter (biomass) present in a given trophic level or ecosystem at a specific moment. Standing State is the total amount of inorganic nutrients (Nitrogen, Phosphorus, Carbon, Calcium) present in the abiotic soil and water pool at a specific moment.
2. Autochthonous vs. Allochthonous Ecosystem InputsAutochthonous organic matter is produced inside the ecosystem's boundaries via internal photosynthesis (e.g., phytoplankton in an open lake). Allochthonous organic matter is imported from outside the ecosystem's boundaries (e.g., fallen terrestrial leaves feeding a shaded headwater stream or cave ecosystem).
3. Natural Ecosystems vs. Artificial AgroecosystemsNatural Ecosystems rely solely on solar or natural tidal power, maintain high species diversity, and recycle nutrients internally in closed loops. Artificial Agroecosystems are engineered for high net yield of a single species, resulting in low diversity, open/leaky nutrient cycles (due to crop harvest removal), and dependence on external human energy subsidies (fertilizers, irrigation, pesticides).
Realm 13 Complete
We have entered **WORLD B — ECOSYSTEM STRUCTURE & FUNCTION** and forged all 30 nodes of **Realm 13: Ecosystem: Concept & Definitions** (`13.01` to `13.30`). Next in queue is **Realm 14: Ecosystem Components** (`[014 / 266]`).