Long-term study of pig carrion entomofauna

Area of Science:

• Forensic Entomology
• Ecological Succession
• Decomposition Studies

Background:

• Long-term carrion entomofauna dynamics remain largely uninvestigated.
• Previous carrion studies rarely exceeded one year in duration.
• Understanding late-stage decomposition insect communities is crucial for forensic science.

Purpose of the Study:

• To investigate the carrion entomofauna of large pig carcasses during their second and third years postmortem.
• To determine if insect fauna in later decomposition stages can be used for estimating extended post-mortem intervals (PMI).

Main Methods:

• Ten large pig carcasses were exposed in Western Poland grasslands.
• Monitoring of entomofauna occurred across different seasons (spring, early summer, late summer) from 2012 to 2014.
• Species composition and colonization patterns were analyzed across different postmortem intervals.

Main Results:

• A total of 72 species were identified in the second year and six in the third year postmortem.
• Carcasses exposed in late summer showed higher species diversity in the second/third year compared to spring/early summer exposures.
• Recolonization by necrophagous and predatory arthropods occurred in the second and third years, influenced by initial carcass exposure timing.

Conclusions:

• Insect fauna present in carcasses with a long post-mortem interval (PMI) can be utilized for PMI estimation.
• Larval overwintering and extended larval residency were observed, highlighting the persistence of insect activity.
• The timing of carcass exposure significantly influences long-term insect community composition and recolonization patterns.