Ecology Calculators

0 calculators tagged with “Ecology”

Ecology is the scientific study of the interactions between organisms and their physical and biological environment. It spans multiple levels of organization — from individual organisms responding to their environment (ecophysiology), to populations (population ecology), communities of species (community ecology), and entire ecosystems including their abiotic components (ecosystem ecology). Key ecological concepts include energy flow through food webs, nutrient cycling (carbon, nitrogen, phosphorus cycles), species diversity, predator-prey dynamics, competition, and ecological succession. Applied ecology underpins conservation biology, wildlife management, restoration ecology, and climate change science.

All Calculators

No calculators found for this topic.

Levels of Ecological Organization

  • Individual: ecophysiology — how organisms respond to temperature, light, water
  • Population: abundance, density, age structure, growth rates
  • Community: species interactions — competition, predation, mutualism, parasitism; succession and diversity
  • Ecosystem: energy flow and nutrient cycling through biotic + abiotic components
  • Biome: major habitat types defined by climate and dominant vegetation
  • Biosphere: global ecology; Earth system processes

Energy Flow

Primary production (GPP, NPP) → herbivores → carnivores → decomposers. ~10% efficiency per trophic level (Lindeman's rule). NPP = GPP − autotrophic respiration.

Key Principles

Liebig's law of the minimum: growth limited by scarcest resource. Competitive exclusion: two species competing for identical resources cannot coexist. Lotka-Volterra: predator-prey dynamics and competition models.

Glossary

Ecology
The scientific study of interactions among organisms and between organisms and their abiotic environment; operates from individual to biosphere scales; underpins conservation, wildlife management, and climate science.
Net Primary Production (NPP)
GPP − autotrophic respiration; the organic carbon available to consumers; units g C m⁻² yr⁻¹; global NPP ≈ 120 Pg C/yr; drives food web energy and ecosystem carbon storage.
Trophic Level
A feeding level in a food web; producers (level 1) → primary consumers (2) → secondary consumers (3); ~10% energy transferred per level (Lindeman's efficiency); determines ecosystem biomass pyramids.

Frequently Asked Questions

Ecology is the scientific study of interactions among organisms and between organisms and their abiotic (non-living) environment. It operates at multiple scales: Physiological ecology: how individuals respond to environmental conditions. Population ecology: dynamics of single-species groups — growth, abundance, age structure. Community ecology: interactions between species — competition, predation, mutualism, parasitism, succession, diversity. Ecosystem ecology: energy flow and nutrient cycling through entire systems. Landscape ecology: spatial patterns and connectivity. Global ecology: biogeochemical cycles, climate, planetary boundaries.

Population: all individuals of the same species in a defined area — shares a gene pool; studied for abundance, density, growth rate, age structure. Community: all species (populations) in a defined area — no gene pool shared; studied for species composition, diversity, interactions, and succession. Ecosystem: a community plus its abiotic (non-living) environment — soil, water, nutrients, energy inputs; studied for energy flow and nutrient cycling. Progression: individuals → populations → communities → ecosystems → biomes → biosphere.

Energy enters most ecosystems through photosynthesis: GPP (gross primary production) = total CO₂ fixed; NPP (net primary production) = GPP − autotrophic respiration — the energy available to consumers. Trophic levels: Primary producers (plants, algae) → Primary consumers (herbivores) → Secondary consumers (carnivores) → Tertiary consumers → Decomposers (fungi, bacteria). Each trophic transfer is ~10% efficient (Lindeman's rule): 90% lost as heat, respiration, and unassimilated material. A food chain with 4 trophic levels: if NPP = 1,000 g/m²/yr → herbivores receive 100 → carnivores 10 → top predators 1 g/m²/yr.

Ecological succession: directional, predictable change in species composition over time following disturbance or colonization. Primary succession: bare, unmodified substrate (volcanic rock, glacial outwash) → pioneer species (lichens, mosses) → soil development → increasingly complex communities. Secondary succession: after disturbance with soil intact (fire, logging) → faster, because seed bank and nutrients remain. Mechanisms: facilitation (early species modify the environment to suit later ones); inhibition; tolerance. Climax community: the relatively stable, self-sustaining end state. In practice, many ecosystems experience ongoing disturbance and may never reach a static climax — the 'shifting mosaic' concept.