Food web

Definition

A network of interconnected food chains that maps feeding relationships among species within an ecological community, showing the flow of energy and nutrients from primary producers through multiple consumer levels. Unlike a linear food chain, a food web captures the complexity of real ecosystems where most species consume—and are consumed by—multiple organisms, forming reticulate pathways that stabilize community structure and buffer against species loss.

Etymology

Coined by Charles Elton in 1927, extending the 'food chain' concept to describe the branching, interconnected nature of ecological feeding relationships.

Example

In a temperate forest floor food web, oribatid mites (Acari) consume decomposing leaf litter and fungal hyphae, serving as prey for predatory mesostigmatid mites and small spiders; these microarthropods in turn support larger invertebrate predators such as centipedes and carabid beetles, with energy ultimately flowing to vertebrate insectivores.

Synonyms

• Trophic web
• Food cycle

Related Terms

• food chain
• trophic level
• Trophic cascade
• Energy flow
• Ecological network
• detritivore
• Predator-prey dynamics
• Ecological pyramid
• biomagnification

Usage Notes

Distinguished from 'food chain' by its reticulate, multidirectional structure. Food webs are typically analyzed at the community or ecosystem scale and may be constructed as 'connectedness webs' (all potential links) or 'energy flow webs' (quantified by interaction strength). In entomology and arachnology, food webs reveal the critical roles of small invertebrates as both consumers and prey in nutrient cycling and energy transfer.