Soil Microbiome
Definition
The total community of microorganisms inhabiting a soil sample. Each location has a characteristic baseline community shaped by climate, vegetation, and soil chemistry. Forensic soil microbiome analysis exploits the fact that this community shifts detectably when a body decomposes in the soil.
- Definition scope
- Total microbial community in a soil sample
- Shaped by
- Climate, vegetation, soil chemistry
- Forensic signal
- Detectable shift from decomposition
- Application area
- Microbial/microbiome forensic evidence
Common questions
How can a soil microbiome help estimate time since death?+
As a body decomposes, it releases fluids and nutrients that predictably shift the local microbial community's composition over time. Researchers have characterised patterns in this succession, which can be compared to a decomposition-associated soil sample to estimate a postmortem interval.
Why is a baseline soil microbiome sample important in this kind of analysis?+
Because the microbial community naturally varies by climate, vegetation, and local chemistry even without decomposition, an uncontaminated control sample from nearby undisturbed soil is needed to distinguish a decomposition-driven shift from the site's ordinary microbial baseline.
Is soil microbiome analysis as established in court as traditional soil mineral comparison?+
No, it is a newer and still developing forensic technique compared to long-established mineral and physical soil comparison, and its acceptance and standardisation for courtroom use varies considerably by jurisdiction and case.
Related terms
- 16S rRNA Amplicon Sequencing
- A targeted sequencing approach that amplifies a variable region of the bacterial 16S ribosomal RNA gene, which acts as a universal phylogenetic...
- Cadaver Decomposition Island (CDI)
- A local zone of ecological or chemical change associated with decomposition of animal or human remains. Effects depend on deposition, substrate and...
- Metagenomics
- The direct sequencing of all DNA extracted from an environmental sample, bypassing the need to culture individual organisms. It produces a community-wide...
- Post-Mortem Interval (PMI)
- The elapsed time between death and a specified later observation, usually recovery or examination. Biological observations may address only colonisation, exposure or...
- Thanatomicrobiome
- The community of microorganisms that colonise a body after death, arising primarily from gut bacteria that breach the intestinal wall and spread...