Publication Date

10-1-2011

Document Type

Report

Publication Title

Defence R&D Canada – Centre for Security Science

Abstract

Forensic entomology is a science used to estimate a post-mortem interval (PMI). Larvae develop at predictable rates and the time interval for this development can be used to estimate the PMI. Environmental temperatures are not constant and fluctuate with the photoperiod. In early and late insect seasons, temperatures can drop to below threshold temperatures where development essentially ceases. Threshold temperatures differ for different species and should be determined by raising insects at the extremely low temperatures. The lower threshold temperature for Protophormia terraenovae for egg hatch is 10.3°C ; for first instar larvae to molt to second instar larvae it is is 10.7°C ; it falls between 10.7 and 11 °C to reach third instar, and is 11 °C to reach post feeding third instar larvae. In order to pupate, the temperature threshold falls between 11.5 and 11.7 °C and adult emergence is completed only at temperatures above 11.7°C.

It was shown that if P. terraenovae was raised at a higher temperature for a period of time and only exposed to temperatures below thresholds at a later larval stage, development could continue.

Keywords

Diptera, Forensic analysis, Canada, Entomology, Exposure(General), Insects, Larvae, Low temperature, Predictions, Time intervals, Foreign reports, Post-mortem interval, Time of death

Comments

This is the Version of Record and can also be found online here

Department

Justice Studies

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