# Population dynamics
## MicroSim spec
- **Recommended sim type:** predator-prey dynamics
- **Microsimmability score:** 90/100
- **Layout:** drawing region (canvas) on top; control region (sliders/buttons) below.
### Parameters (tunable controls)
- `Prey birth rate`
- `Predation rate`
- `Predator death rate`
### What animates
Predator and prey populations cycle up and down in coupled waves as the rates change.
### Learning objective
Relate population cycles to birth, predation, and death rates.
## Links (Wikipedia order)
<!-- injected from _registry/childlinks/Population_dynamics.json (2026-07-30T02:09:12Z) -->
`7_Billion_Actions` · `Abstinence` · `Academic_Press` · `Accademia_dei_Lincei` · `Algebra` · `An_Essay_on_the_Principle_of_Population` · `Andrey_Korotayev` · `Antinatalism` · `Arditi–Ginzburg_equations` · `Bacteria` · `Benjamin_Gompertz` · `Bennett's_law` · `Biocapacity` · `Biocoenosis` · `Biological_organisation` · [[Biological_system]] · `Biome` · `Biomolecule` · `Biosphere` · [[Carrying_capacity]] · `Cell_(biology)` · `Ceteris_paribus` · `Church_of_Euthanasia` · `Compulsory_sterilization` · `Computer_simulation` · `Consumer-resource_model` · [[Control_theory]] · `Day_of_Eight_Billion` · `Day_of_Seven_Billion` · `Day_of_Six_Billion` · `Delayed_density_dependence` · `Demographic_transition` · `Demographics_of_the_world` · `Demography` · `Dependency_ratio` · `Derivative` · [[Differential_equation]] · `Dispatchable_generation` · [[Doubling_time]] · `Dysgenics` · `Ecology_(journal)` · `Ecology_Letters` · [[Ecosystem]] · `Epidemiology` · `Escherichia_coli` · `Estimates_of_historical_world_population` · `Eugenics` · `Eukaryote` · [[Evolutionarily_stable_strategy]] · [[Evolutionary_game_theory]] · `Exponential_growth` · `Family_planning` · `French_National_Centre_for_Scientific_Research` · `Geometric_progression` · `Green_Revolution` · [[Half-life]] · `Human_impact_on_the_environment` · `Human_migration` · `Human_overpopulation` · `Human_population_planning` · `Human_population_projections` · `I_=_PAT` · `Integrated_pest_management` · `Intergenerational_equity` · `International_Conference_on_Population_and_Development` · `John_Maynard_Smith` · `Journal_of_Bacteriology` · `Journal_of_Experimental_Botany` · `Journal_of_Molecular_Biology` · `Journal_of_Theoretical_Biology` · `Kaya_identity` · `Limit_(mathematics)` · `List_of_countries_by_dependency_ratio` · `List_of_countries_by_number_of_births` · `List_of_largest_cities` · `List_of_population_concern_organizations` · `Logistic_function` · [[Ludwig_von_Bertalanffy]] · [[MIMO]] · `Macromolecular_assembly` · `Macromolecule` · `Malthusian_growth_model` · `Malthusianism` · `Mathematical_and_theoretical_biology` · `Mathematical_induction` · `Maximum_sustainable_yield` · `Mere_addition_paradox` · `Minimum_viable_population` · `Natalism` · `Natural_number` · `Neisseria_meningitidis` · `Net_migration_rate` · `Nicholson–Bailey_model` · `Oikos_(journal)` · `One-child_policy` · `Organ_(biology)` · `Organelle` · `Organism` · [[Oscillation]] · `Overconsumption` · `Overshoot_(population)` · `Pest_insect_population_dynamics` · `Peter_Turchin` · `Physiological_density` · `Pierre_François_Verhulst` · `Plant` · `Plant_disease` · `Political_demography` · `Population_(biology)` · `Population_(human_biology)` · `Population_Action_International` · `Population_Connection` · `Population_Matters` · `Population_and_Development_Review` · `Population_and_Environment` · `Population_and_housing_censuses_by_country` · `Population_biology` · `Population_cycle` · `Population_decline` · `Population_density` · `Population_dynamics_of_fisheries` · `Population_ecology` · `Population_ethics` · `Population_genetics` · [[Population_growth]] · [[Population_model]] · `Population_momentum` · `Population_pyramid` · `Population_size` · `Princeton_University_Press` · `R/K_selection_theory` · `Random_generalized_Lotka–Volterra_model` · `Rate_of_natural_increase` · `Reproductive_rights` · `Resonance_(journal)` · `Ricker_model` · `Ronald_Fisher` · `Scholarpedia` · `Seasonality` · `SimCity_(1989_video_game)` · `Simulation` · `Single-input_single-output_system` · `Sustainability` · `Sustainable_population` · [[System_dynamics]] · `Tissue_(biology)` · `Two-child_policy` · `Ultima_Online` · `United_Nations_Population_Fund` · `United_Nations_world_population_conferences` · `University_of_Alberta` · `Voluntary_Human_Extinction_Movement` · `Water_supply_network` · `Woodstock,_Oxfordshire` · `World3` · `World_Population_Conference` · `World_Population_Day` · `World_Population_Foundation` · `World_population` · `World_population_milestones` · `Zero_population_growth`
## From the Real GENERATIVE library (beauty pass)
*Population dynamics — image hotlinked from Wikimedia Commons (via the Real G.E.N.E.R.A.T.I.V.E. course library, STEM and Music room). [Details & license](https://commons.wikimedia.org/wiki/File:Operophtera.brumata.6961.jpg).*
> Population dynamics is the type of mathematics used to model and study the size and age composition of populations as dynamical systems. ([Wikipedia](https://en.wikipedia.org/wiki/Population_dynamics))
<!-- BEAUTY-PASS-MEDIA:END -->
> p5.js MicroSim stub · part of Systems Thinking · [Wikipedia source](https://en.wikipedia.org/wiki/Population_dynamics)
> Relation: subfield of systems thinking.
## Concept summary
Population dynamics is the type of mathematics used to model and study the size and age composition of populations as dynamical systems. Population dynamics is a branch of mathematical biology, and uses mathematical techniques such as differential equations to model behaviour.
## Build checklist
- [ ] Claim it: set `status: in-progress` + `lease` + `leased_at`
- [ ] Write the child page explaining the concept (tie it back to systems thinking)
- [ ] Finalize parameter ranges and defaults
- [ ] Implement the p5.js sketch (drawing + control regions)
- [ ] Add caption + the learning objective on the page
- [ ] Set `status: done`
## p5.js sketch
```javascript
// MicroSim: Population dynamics
let controls = {};
function setup() {
// createCanvas(...); create sliders for the parameters above.
}
function draw() {
// background(...); read controls; render predator-prey dynamics; respond live.
}
```
---
Back to Systems Thinking · Wikipedia: [Population dynamics](https://en.wikipedia.org/wiki/Population_dynamics)
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## Semiotic profile
> *The semiotic universals this article invokes, machine-derived from the crossref — **unverified** (born so). Populated 2026-07-06 for the Systems room.*
**Universals (5):** 🟡 system (14) · 🟡 science (5) · 🟢 cycle (3) · 🟢 oscillation (1) · 🟢 wave (1)
**Enter by sign:** Systems Semiotic Gateway · Alphabetum · Icon Registry · ← Systems Portal
<!-- SEMIOTIC-PROFILE:END -->
<!-- BEAUTY-PASS-MEDIA:START -->
## Wikipedia : Wikitube
**Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Population_dynamics) : [Wikitube](https://en.wikitube.io/wiki/Population_dynamics)
## Previous hub tags
Tree parents: [[Agent-based_model]] · [[Complex_system]] · [[Cybernetics]] · [[Dynamical_system]] · [[Emergence]] · [[Feedback]] · [[Phase_space]] · [[Self-organization]] · [[System_dynamics]] · [[Systems_science]] · [[Systems_theory]].
Legacy hubs: none.
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*Sources: 2 legacy notes. Minted wave 1, 2026-07-30 (v1.6 order).*