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Etude de la biologie des insectes nécrophages et application à l'expertise en entomologie médico-légale

Abstract : When a cadaver is discovered, investigators need to determine precisely the date and time of death. This information is provided by forensic examiners through the study of cadaver characteristics and decomposition state. However, these techniques are effective only during few days after the death. After this delay, the post-mortem interval (PMI) estimation based on these parameters becomes difficult and imprecise. In this case, is it possible to use forensic entomology, the analysis of necrophagous insects sampled on the cadaver to estimate the time of the death. The main goal is to date the first eggs layed on the cadaver by calculating the age of sampled insects.

The first aim of the present study is to improve the knowledge about the behaviour and the development of necrophagous dipterans. Experiments performed cover the seasonal trend in necrophagous insect populations, variations in the intrinsic speed of development of larvae, their displacement speed, the structure and behaviour of maggot masses, and the thermal behaviour of corpses. For each of these points, a detailed literature review was conducted. Material, methods and the results are detailed and analyzed, and replaced in the forensic entomology application field.

The data and observations obtained during this research have also formed the basis for a computer based development model, which simulates the development and behaviour of dipterans necrophagous larvae on a body. In addition to its explanatory function, this simulation tool is the first level of a huge reasoning system. Designed to achieve expertise in forensic entomology, this program can estimate the moment of death from the comparison between simulations results and specimens sampled on a body.

Thus, this thesis focuses on a dual goal: increase the knowledge on the biology of necrophageous insects, and improve the accuracy and reliability of entomological expertises through the development of computer analysis
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Contributor : Damien Charabidze <>
Submitted on : Tuesday, December 2, 2008 - 3:47:36 PM
Last modification on : Sunday, October 25, 2020 - 7:07:06 AM
Long-term archiving on: : Monday, June 7, 2010 - 8:42:01 PM


  • HAL Id : tel-00343660, version 1



Damien Charabidze. Etude de la biologie des insectes nécrophages et application à l'expertise en entomologie médico-légale. Sciences du Vivant [q-bio]. Université du Droit et de la Santé - Lille II, 2008. Français. ⟨tel-00343660⟩



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