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Temperature-dependent appearance of forensically useful beetles on carcasses
Szymon Matuszewski1, Michał Szafałowicz
1Laboratory of Criminalistics, Adam Mickiewicz University, Św. Marcin 90, 61-809 Poznań, Poland. szymmat@amu.edu.pl
Forensic Science International
|May 21, 2013
Summary
Estimating insect pre-appearance interval (PAI) using temperature shows promise for post-mortem interval (PMI) estimation. Most tested beetle species, excluding Dermestes frischii, demonstrated a significant temperature-PAI relationship, crucial for forensic entomology.
Area of Science:
- Forensic Entomology
- Ecological Entomology
- Forensic Science
Background:
- Estimating post-mortem interval (PMI) is critical in forensic investigations.
- Temperature-dependent insect development offers a promising method for refining PMI estimations.
- The pre-appearance interval (PAI) of carrion insects is influenced by ambient temperature.
Purpose of the Study:
- To evaluate the relationship between temperature and the pre-appearance interval (PAI) for forensically relevant beetle species.
- To determine the suitability of selected beetle taxa for temperature-based post-mortem interval estimation.
- To assess the strength of the temperature-PAI correlation across different beetle life stages (adults and larvae).
Main Methods:
- Thirty pig carcasses were used as models in open and forest habitats in Western Poland.
- Beetles were collected using pitfall traps, manual sampling, and soil sampling.
- Ground-level temperature was recorded, and the relationship between temperature and PAI was analyzed for adult and larval stages of various beetle species.
Main Results:
- A significant relationship between temperature and PAI was observed in all tested species except Dermestes frischii.
- The PAI showed an exponential decrease with increasing temperature for most species, becoming nearly constant at higher temperatures.
- Strong correlations were found for Necrodes littoralis, Necrobia rufipes, Creophilus maxillosus, Philonthus politus, Saprinus semistriatus, and Saprinus planiusculus.
Conclusions:
- The study provides strong evidence for using temperature to estimate PAI in several beetle species, including Thanatophilus sinuatus, N. littoralis, N. rufipes, N. violacea, C. maxillosus, P. politus, S. semistriatus, S. planiusculus, and Margarinotus brunneus.
- These findings support the application of temperature-based PAI estimation in forensic entomology casework.
- The exponential relationship between temperature and PAI highlights its potential for improving post-mortem interval accuracy.
