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Previous issue date: 2013-03-12 / Forensic entomology is the science applied in the use of insects allied to legal procedures, being used as a complementary tool for scientific police and crime scene investigators of the country in the determination of the post mortem interval (PMI). To this end, we mention two ways to determine the PMI: the age of immature specimens collected in association with carcasses and the following succession of insects present. In Brazil, few studies focus on forensic entomology, and data collected in a geographic area cannot be applied in other one due to the high diversity of insect species in the Country. Therefore, this study aimed to determine the pattern of entomofauna succession of decomposing carcasses in southern Brazil, correlating to the stages of decomposition and abiotic factors and evaluate the interference of larvae of Chrysomya albiceps in the detection of other species of scavengers insect larvae. The experiment was conducted at the ?guas Belas Research Station and Production of the State Foundation for Agricultural Research in Viam?o, in southern Brazil. It was used three domestic pigs with approximately 16 kg, slaughtered by firearm shooting and immediately placed in protection boxes with metal mesh. For the entomofauna sampling, it was used insect nets, manual collection and pitfall traps, collections being made daily at noon. The carcasses were observed and photographed, and the data of temperature and humidity were recorded. We captured 569 adult specimens, belonging to 29 families, 55 genera and 68 morphospecies. Scarabaeidae was the most abundant family among the adult insects, representing approximately 25% of the individuals collected, followed by Calliphoridae (23%). The 269 immature specimens sampled, comprising a genus and two species. The prevalence of Chrysomya albiceps was evident, with 97.4% of the individuals collected. It was observed five stages of decomposition during the fourteen days that comprised the experiment. The stage of decomposition with the largest number of individuals, adults and immatures, and species richness was black putrefaction, while in the skeletonization stage there was a large decrease of this number. The prevalence of immature C. albiceps during the decomposition process affected the detection of individuals of other scavenger species. Furthermore, only third instar specimens were collected, which may be related to predatory and cannibalistic behavior of the species over others. / A entomologia forense ? a ci?ncia aplicada no uso de insetos aliados a procedimentos legais, sendo utilizada como ferramenta complementar pelas pol?cias cient?ficas e per?cias criminais do pa?s na determina??o do intervalo post-mortem (IPM). Para tal, citam-se duas maneiras para determina??o do IPM: idade dos esp?cimes imaturos coletados associados a carca?as e sequ?ncia na sucess?o de insetos presentes. No Brasil, poucos trabalhos focam na Entomologia Forense, e os dados levantados em uma ?rea geogr?fica n?o podem ser aplicados em outras devido a alta diversidade de esp?cies de insetos no pa?s. Portanto, o presente estudo objetivou determinar o padr?o sucessional para a entomofauna de carca?as em decomposi??o no sul do Brasil, correlacionando-o com as fases de decomposi??o e os fatores abi?ticos e avaliar a interfer?ncia de imaturos de Chrysomya albiceps (Diptera, Calliphoridae) na detec??o de outras esp?cies de larvas de insetos necr?fagos. O experimento foi realizado na Esta??o de Pesquisa e Produ??o ?gua Belas da Funda??o Estadual de Pesquisa Agropecu?ria, em Viam?o, no sul do Brasil. Foram utilizados tr?s porcos dom?sticos com aproximadamente 16 kg, abatidos por disparo de arma de fogo e imediatamente dispostos em caixas de prote??o com malha met?lica. Para amostragem da entomofauna, utilizou-se rede entomol?gica, coleta manual e armadilhas pitfall, sendo as coletas realizadas diariamente, ao meio dia. As carca?as foram observadas e fotografadas, e os dados de temperatura e umidade foram registrados. Foram capturados 569 esp?cimes adultos, pertencentes a 29 fam?lias, 55 g?neros e 68 morfoesp?cies. Scarabaeidae foi a fam?lia mais abundante entre os insetos adultos, representando aproximadamente 25% dos indiv?duos coletados, seguida por Calliphoridae (23%). Os 269 esp?cimes imaturos amostrados, compreendem um g?nero e duas esp?cies. A preval?ncia de Chrysomya albiceps foi evidente, com 97,4% dos indiv?duos coletados. Foram observadas cinco fases de decomposi??o durante os quatorze dias que compreenderam o experimento. A fase de decomposi??o com o maior n?mero de indiv?duos, adultos e imaturos, e riqueza de esp?cies foi a de putrefa??o negra, ao passo que na fase de esqueletiza??o houve um elevado decr?scimo deste n?mero. A preval?ncia de imaturos de C. albiceps durante o processo de decomposi??o afetou a detec??o de indiv?duos de outras esp?cies necr?fagas. Al?m disso, somente esp?cimes de terceiro instar larval foram coletados, fato que pode ser relacionado ao comportamento predador e canibal da esp?cie sobre as demais.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/253 |
| Date | 12 March 2013 |
| Creators | Ries, Ana Carolina Reimann |
| Contributors | Blochtein, Betina |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Zoologia, PUCRS, BR, Faculdade de Bioci?ncias |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 2008925231902741151, 500, 600, 36528317262667714 |
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