Body Movement Inference
Definition
The forensic application: using the population-genetic signature of insects collected from a body to estimate where colonisation occurred, and therefore potentially where the body was at the time of death.
- Underlying data
- Population-genetic signature of insects collected from the body
- Inference target
- Location where insect colonisation began
- Forensic use
- Corroborates or challenges a claimed body-movement scenario
- Field
- Forensic entomology, population genetics
Common questions
How reliable is body movement inference compared to other postmortem interval methods?+
It is a corroborative line of evidence rather than a standalone determination. It works best when the insect population's genetic markers show clear regional differentiation, which is not guaranteed for every species or region, so it is used alongside scene evidence and standard entomological postmortem interval estimates.
What distinguishes this from simply identifying the insect species present?+
Species identification alone only says which insects were present, which can be consistent with many locations. Population genetics goes a level deeper, comparing the genetic signature of the specific insects collected against reference populations from different geographic areas to narrow down where colonisation most likely occurred.
Related terms
- Gene Flow
- The movement of alleles between populations through migration and reproduction. High gene flow homogenises populations; low gene flow allows them to differentiate...
- Genetic Structure
- The degree to which populations within a species are genetically differentiated from each other. Measured by statistics like Fst (fixation index). High...
- Haplotype
- A specific set of genetic variants inherited together, typically used here for mitochondrial DNA variants. Different geographic populations of the same species...
- Phylogeography
- The study of the geographic distribution of genetic lineages within and among closely related species. Provides the reference maps that forensic population...
- Reference Population Panel
- A georeferenced dataset of sequences from known collection localities, used as the comparison baseline when the provenance of a forensic specimen is...