Community

Definition

An assemblage of populations of two or more species that co-occur in the same habitat or area and interact through trophic and spatial relationships; the living component of an ecosystem. In arthropod ecology, the term emphasizes species composition, relative abundance, and functional roles rather than taxonomic identity alone.

Etymology

From Latin communitas, meaning fellowship or organized society

Example

A riparian insect community might include predatory dragonfly nymphs, shredding caddisfly larvae, filtering black fly larvae, and algal-scraping mayflies, together processing organic matter and supporting higher trophic levels.

Synonyms

• Assemblage
• biocoenosis
• biotic community

Related Terms

• Population
• guild
• Ecosystem
• trophic structure
• Species diversity
• Ecological succession
• Habitat

Usage Notes

Distinguished from population (single species) and ecosystem (includes abiotic factors). 'Assemblage' is often preferred when emphasizing the co-occurrence of species without assuming strong interaction; 'guild' groups species by shared resource use regardless of taxonomy. Community boundaries are often defined operationally by the investigator rather than by natural discontinuities.