Methods to Assess Microbial Communities

A microbial community is a consortium of bacteria, archaea, and microbial eukaryotes that coexist and interact within a shared habitat.

Microbial community structure is often described using richness, relative abundance, and evenness.

In a sample, richness is the number of taxa detected, while relative abundance quantifies each taxon’s proportion. Evenness describes how uniformly individuals are distributed across taxa.

Currently, culture-independent molecular approaches are used to profile microbial communities.

Metagenomics studies DNA from environmental samples, such as soil, and is largely used to profile microbial community composition.

Metatranscriptomics enables the assessment of mRNA expression, giving a snapshot of the active microbial functions, like enzyme production or oil degradation.

Metaproteomics and metabolomics identify proteins and metabolites in the environment, revealing how microbes contribute to processes like nutrient breakdown and biogeochemical cycling.