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Impact of Constant Versus Fluctuating Temperatures on the Development and Life History Parameters of Aldrichina grahami (Diptera: Calliphoridae)

1
Department of Forensic Science, School of Basic Medical Sciences, Central South University, Changsha 410013, China
2
Department of Forensic Science, School of Basic Medical Sciences, Xinjiang Medical University, Urumqi 830011, China
*
Author to whom correspondence should be addressed.
These two authors contributed equally to this work.
Insects 2019, 10(7), 184; https://doi.org/10.3390/insects10070184
Received: 7 May 2019 / Revised: 14 June 2019 / Accepted: 18 June 2019 / Published: 26 June 2019
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Abstract

Necrophagous fly species are commonly used as forensic tools to estimate the minimum postmortem interval (PMImin). Many researchers raised necrophagous flies under constant temperature regimes to collect their developmental data. However, in most forensic cases, the ambient temperature fluctuates. In order to investigate a forensically important fly developmental mode (the Isomegalen diagram, Isomorphen diagram and Thermal summation models) and make comparisons of the developmental rate between constant temperatures and fluctuating temperatures, we used Aldrichina grahami (Diptera: Calliphoridae) to investigate the life history parameters at eight constant temperatures ranging from 8 to 36 °C. We also compared developmental rate of A. grahami in three groups of constant versus fluctuating temperatures: 8 °C vs. 6–12 °C, 12 °C vs. 10–16 °C, and 16 °C vs. 14–20 °C. Our data showed that A. grahami is cold tolerant with a mean (±SE) development threshold temperature (D0) of 3.41 ± 0.48 °C and a thermal summation constant (K) of 8125.2 ± 288.4-degree hours. The three groups subjected to fluctuating temperatures took longer to develop compared to those developing in constant temperatures when simulated in a model. These results not only provide detailed developmental data for the use of A. grahami in the estimation of the PMI, but also indicate that ambient temperature fluctuation must be taken into consideration for the use of all necrophagous fly species. View Full-Text
Keywords: necrophagous fly; PMImin; developmental duration; Aldrichina grahami; fluctuating temperatures necrophagous fly; PMImin; developmental duration; Aldrichina grahami; fluctuating temperatures
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Chen, W.; Yang, L.; Ren, L.; Shang, Y.; Wang, S.; Guo, Y. Impact of Constant Versus Fluctuating Temperatures on the Development and Life History Parameters of Aldrichina grahami (Diptera: Calliphoridae). Insects 2019, 10, 184.

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