Early post-mortem changes and stages of decomposition in exposed cadavers

Area of Science:

• Forensic Science
• Forensic Entomology
• Thanatology

Background:

• Decomposition begins at death and concludes with skeletonization.
• Traditional post-mortem interval (PMI) estimation relies on observable physical changes (e.g., rigor mortis).
• Forensic entomology, utilizing insects and other arthropods, offers a complementary method for PMI determination.

Purpose of the Study:

• To describe the five distinct stages of cadaver decomposition.
• To characterize these stages by physical parameters.
• To correlate decomposition stages with specific arthropod assemblages.

Main Methods:

• Observation of gross physical changes in exposed cadavers.
• Identification and analysis of arthropod communities present during decomposition.
• Categorization of decomposition into five stages: Fresh, Bloated, Decay, Postdecay, and Skeletal.

Main Results:

• Each decomposition stage is associated with characteristic physical changes.
• Specific arthropod species and groups are found at different decomposition stages.
• A framework is established to link physical parameters and arthropod data for PMI estimation.

Conclusions:

• Decomposition is a continuous process best understood through distinct stages.
• Arthropod succession is a critical indicator for estimating the post-mortem interval.
• Integrating physical and entomological data enhances the accuracy of PMI assessments.