Thermal requirements for the development of immature stages of Fannia canicularis (Linnaeus) (Diptera: Fanniidae)

Forensic Science International : Synergy
Andrzej Grzywacz

Abstract

Entomological material may be used to estimate the time since death occurred (minimum post-mortem interval, mPMI) in forensically obscure cases. The method commonly used to calculate mPMI is the application of a thermal summation model. Little is known about the thermal requirements of Fanniidae. To fill this gap, the influence of temperature on the development time of Fannia canicularis (Linnaeus), a cosmopolitan species with the potential to be used in forensic entomology, was studied. An experiment was performed under nine ambient temperatures. The thermal summation constants (k) and developmental zeros (Tmin) of this species were calculated for six developmental events: hatching, first ecdysis, second ecdysis, wandering, pupariation, and eclosion. Data were primarily analysed with two linear models, and then, since the relationship between temperature and development rate is curvilinear close to the lower and higher developmental thresholds, the relationship was also modelled using three nonlinear models. A fourth nonlinear model was also used to estimate the intrinsic optimum temperature of F. canicularis, at which the population size is maximal and the mortality is the lowest. At 33 °C, larvae did not hatch from eggs, and...Continue Reading

Citations

Apr 9, 2020·International Journal of Legal Medicine·Katarzyna Frątczak-ŁagiewskaSzymon Matuszewski
Apr 6, 2020·International Journal of Legal Medicine·Stefan PittnerJens Amendt
May 15, 2021·Science & Justice : Journal of the Forensic Science Society·Razieh Shabani KordshouliMohammad Ali Oshaghi

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