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Temperature-dependent appearance of forensically useful flies on carcasses.

Matuszewski S, Szafałowicz M, Grzywacz A - Int. J. Legal Med. (2013)

Bottom Line: Adult and oviposition PAI of Calliphora vomitoria and adult PAI of Hydrotaea pilipes were not related to temperature.Adult and oviposition PAI of Lucilia sericata and Lucilia caesar responded similarly, with an abrupt and large increase in a narrow range of low temperatures and no response in a broad range of high temperatures.Probably, different mechanisms form the basis for the response of PAI to temperature in flies colonizing carcasses shortly after death and flies colonizing carcasses later in the decomposition process.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Criminalistics, Adam Mickiewicz University, Św. Marcin 90, 61-809, Poznań, Poland, szymmat@amu.edu.pl.

ABSTRACT
Flies are frequently used for postmortem interval (PMI) estimations. These estimates are usually based on the age of larval or pupal specimens. However, the age defines only the minimum PMI. In order to move forensic entomology further, a method useful for the estimation of an interval preceding insect appearance on a corpse called the pre-appearance interval (PAI) is needed. Recently, it was demonstrated that the PAI of several carrion beetles is closely related to the temperature prevailing throughout this interval. Hence, it was postulated to estimate PAI from temperature. In order to check premises for using this approach with flies, a test of the relationship between adult or oviposition PAI and temperature was made for nine species of European flies. Data on PAI originated from pig carcasses decomposing under various temperatures. Adult PAI of Hydrotaea dentipes, Hydrotaea ignava, Hydrotaea similis, Phormia regina, and Stearibia nigriceps and oviposition PAI of S. nigriceps were exponentially related to temperature. Only S. nigriceps revealed a close relationship, demonstrating solid premises for PAI estimation from temperature alone. Adult and oviposition PAI of Calliphora vomitoria and adult PAI of Hydrotaea pilipes were not related to temperature. Adult and oviposition PAI of Lucilia sericata and Lucilia caesar responded similarly, with an abrupt and large increase in a narrow range of low temperatures and no response in a broad range of high temperatures. Probably, different mechanisms form the basis for the response of PAI to temperature in flies colonizing carcasses shortly after death and flies colonizing carcasses later in the decomposition process.

Show MeSH
The PAI and ground-level temperatures averaged for the duration of PAI for C. vomitoria and H. pilipes
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Related In: Results  -  Collection


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Fig1: The PAI and ground-level temperatures averaged for the duration of PAI for C. vomitoria and H. pilipes

Mentions: Adult and oviposition PAI of C. vomitoria and adult PAI of Hydrotaea pilipes showed no relation to temperature at all (Fig. 1). Adult PAI of Hydrotaea dentipes, Hydrotaea ignava, Hydrotaea similis, and Phormia regina were exponentially related to temperature with a clear representation of the minimum PAI, however, with no statistical significance (nonlinear regression, t test for b1, P = 0.47, 0.11, 0.19, and 0.3 respectively; Fig. 2). Adult and oviposition PAI of S. nigriceps were exponentially and significantly associated to temperature with evident representation of the minimum PAI (nonlinear regression, t test for b1, P < 0.001; Fig. 3). LT thresholds for S. nigriceps were 11.3 °C for the adult PAI and 11.4 °C for the oviposition PAI (Table 2).Fig. 1


Temperature-dependent appearance of forensically useful flies on carcasses.

Matuszewski S, Szafałowicz M, Grzywacz A - Int. J. Legal Med. (2013)

The PAI and ground-level temperatures averaged for the duration of PAI for C. vomitoria and H. pilipes
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4196138&req=5

Fig1: The PAI and ground-level temperatures averaged for the duration of PAI for C. vomitoria and H. pilipes
Mentions: Adult and oviposition PAI of C. vomitoria and adult PAI of Hydrotaea pilipes showed no relation to temperature at all (Fig. 1). Adult PAI of Hydrotaea dentipes, Hydrotaea ignava, Hydrotaea similis, and Phormia regina were exponentially related to temperature with a clear representation of the minimum PAI, however, with no statistical significance (nonlinear regression, t test for b1, P = 0.47, 0.11, 0.19, and 0.3 respectively; Fig. 2). Adult and oviposition PAI of S. nigriceps were exponentially and significantly associated to temperature with evident representation of the minimum PAI (nonlinear regression, t test for b1, P < 0.001; Fig. 3). LT thresholds for S. nigriceps were 11.3 °C for the adult PAI and 11.4 °C for the oviposition PAI (Table 2).Fig. 1

Bottom Line: Adult and oviposition PAI of Calliphora vomitoria and adult PAI of Hydrotaea pilipes were not related to temperature.Adult and oviposition PAI of Lucilia sericata and Lucilia caesar responded similarly, with an abrupt and large increase in a narrow range of low temperatures and no response in a broad range of high temperatures.Probably, different mechanisms form the basis for the response of PAI to temperature in flies colonizing carcasses shortly after death and flies colonizing carcasses later in the decomposition process.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Criminalistics, Adam Mickiewicz University, Św. Marcin 90, 61-809, Poznań, Poland, szymmat@amu.edu.pl.

ABSTRACT
Flies are frequently used for postmortem interval (PMI) estimations. These estimates are usually based on the age of larval or pupal specimens. However, the age defines only the minimum PMI. In order to move forensic entomology further, a method useful for the estimation of an interval preceding insect appearance on a corpse called the pre-appearance interval (PAI) is needed. Recently, it was demonstrated that the PAI of several carrion beetles is closely related to the temperature prevailing throughout this interval. Hence, it was postulated to estimate PAI from temperature. In order to check premises for using this approach with flies, a test of the relationship between adult or oviposition PAI and temperature was made for nine species of European flies. Data on PAI originated from pig carcasses decomposing under various temperatures. Adult PAI of Hydrotaea dentipes, Hydrotaea ignava, Hydrotaea similis, Phormia regina, and Stearibia nigriceps and oviposition PAI of S. nigriceps were exponentially related to temperature. Only S. nigriceps revealed a close relationship, demonstrating solid premises for PAI estimation from temperature alone. Adult and oviposition PAI of Calliphora vomitoria and adult PAI of Hydrotaea pilipes were not related to temperature. Adult and oviposition PAI of Lucilia sericata and Lucilia caesar responded similarly, with an abrupt and large increase in a narrow range of low temperatures and no response in a broad range of high temperatures. Probably, different mechanisms form the basis for the response of PAI to temperature in flies colonizing carcasses shortly after death and flies colonizing carcasses later in the decomposition process.

Show MeSH