Food Web Simulator

Simulate and analyze food web interactions in ecosystems. Understand energy flow and trophic relationships.

Food Web Concepts:

  • Trophic Levels: Position in the food chain (producer, primary consumer, secondary consumer, etc.)
  • Energy Transfer: Only ~10% of energy transfers between trophic levels (10% rule)
  • Food Web Stability: Determined by species diversity and interaction complexity
Temperate Forest
Deciduous forest ecosystem
Grassland
Prairie or savanna ecosystem
Freshwater Lake
Lake or pond ecosystem
Marine Coastal
Ocean coastal ecosystem
Custom Ecosystem
Define your own species
Species in Food Web
Food Web Connections

Define which species consume which other species. Drag and drop in the visualization below to create connections.

Simulation Parameters
kcal/m²/year
Solar energy available to producers
%
Percentage of energy transferred between trophic levels
Simulating...

Understanding Food Webs

A food web is a network of interconnected food chains that shows the feeding relationships between species in an ecosystem. It illustrates how energy and nutrients move through the ecosystem.

Key Food Web Components:

  • Producers (Autotrophs): Organisms that produce their own food through photosynthesis
  • Consumers (Heterotrophs): Organisms that consume other organisms for energy
  • Decomposers: Organisms that break down dead organic matter
  • Trophic Levels: Feeding positions in the food chain
  • Energy Pyramid: Graphical representation of energy flow through trophic levels

Trophic Levels and Energy Flow

Trophic Level Role Examples Energy Source
1. Producers Create organic compounds from inorganic materials Plants, algae, phytoplankton Sunlight (photosynthesis)
2. Primary Consumers Feed directly on producers Herbivores, zooplankton Producers
3. Secondary Consumers Feed on primary consumers Carnivores, small predators Primary consumers
4. Tertiary Consumers Feed on secondary consumers Top predators Secondary consumers
Decomposers Break down dead organic matter Bacteria, fungi, detritivores All trophic levels

The 10% Energy Rule

In ecological systems, only about 10% of the energy from one trophic level is transferred to the next. The remaining 90% is lost as:

1

Heat Loss: Metabolic processes generate heat that dissipates

2

Respiration: Energy used for cellular functions and movement

3

Waste Production: Energy contained in undigested materials and excretions

4

Non-predation Mortality: Organisms that die without being consumed

Food Web Stability Factors

1

Species Diversity: Higher diversity often increases stability

2

Connectance: Proportion of possible interactions that actually occur

3

Interaction Strength: How strongly species affect each other

4

Functional Redundancy: Multiple species performing similar roles

5

Keystone Species: Species with disproportionately large effects

Applications of Food Web Analysis

  • Ecosystem Health Assessment: Evaluating the stability and resilience of ecosystems
  • Conservation Planning: Identifying key species and interactions for protection
  • Invasive Species Impact: Predicting effects of introduced species
  • Climate Change Studies: Modeling how warming affects species interactions
  • Fisheries Management: Understanding impacts of harvesting on marine food webs

Ecological Note: Food webs are simplified representations of complex ecological interactions. Real ecosystems contain many more species and connections than can be practically modeled. Food web stability is influenced by factors beyond species interactions, including environmental conditions and spatial dynamics.

Frequently Asked Questions

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. A food web consists of many interconnected food chains and shows the complex network of feeding relationships within an ecosystem. Food webs provide a more complete and realistic picture of energy flow in ecosystems.

The 10% energy rule limits the number of trophic levels in ecosystems. With only 10% of energy transferring from one level to the next, there is insufficient energy to support viable populations beyond 4-5 levels. For example, if producers capture 10,000 kcal, primary consumers get 1,000 kcal, secondary consumers get 100 kcal, tertiary consumers get 10 kcal, and quaternary consumers would only get 1 kcal - not enough to sustain a population.

A keystone species is one whose impact on its ecosystem is disproportionately large relative to its abundance. Removing a keystone species can cause dramatic changes in ecosystem structure and function. Examples include sea otters in kelp forests (they control sea urchin populations) and wolves in Yellowstone (they regulate elk populations, affecting vegetation and other species). Keystone species are important because they maintain the structure and diversity of their ecosystems.

Generally, higher biodiversity increases food web stability through several mechanisms: (1) Insurance effect - more species provide functional redundancy, so if one species declines, others can perform similar roles; (2) Response diversity - different species respond differently to environmental changes, buffering the ecosystem; (3) Complex interactions - more connections can distribute impacts and prevent cascading effects. However, the relationship is complex and depends on the specific characteristics of the species and their interactions.

Human activities can disrupt food webs in multiple ways: (1) Overharvesting - removing key species can cause trophic cascades; (2) Habitat destruction - reduces available resources and disrupts interactions; (3) Pollution - can accumulate in food chains (bioaccumulation) and affect species survival; (4) Climate change - alters species distributions and phenology, disrupting synchrony in interactions; (5) Invasive species - introduce new competitors or predators that native species aren't adapted to. These impacts can reduce ecosystem resilience and lead to simplified, less stable food webs.