keywords: Arthropods, carrions, decomposition, forensic entomology, Warri
The preliminary survey of the entomofauna on decomposing carrions in Warri was undertaken to provide a baseline insect information on carrion decomposition. Seven rabbits (Orytctolaguscuniculus) of mean weight 2.14±0.12kg (M±S.D) sacrificed by cervical dislocation were monitored for 45 days from January, 7th and February 21st, 2017 with daily observation and collection of invading insects. The results obtained revealed four (4) identifiable stages of decomposition (fresh decay, bloated, wet decay, and dry decay) even though the entire decomposition process was a continuous one. Insect species from three (3) Orders i.e. Diptera, Coleoptera and Hymenoptera and fourteen families were consistently sampled. Most species from Diptera and Coleoptera were of forensic importance as they used the carrions as breeding ground thus providing a biological tracking template for a possible estimate of time since carrions were killed or exposed. The Hymenopteran species were mainly opportunistic, as they used carrions for food and temporary shelter. It is suggested that further work be carried out within the Warri metropolis and other areas in order to obtain all likely insects of forensic importance unique to the areas.
Abajue MC, Ewuim SC &Akunne CE 2013. Insects associated with decomposing pig carrions in OkijaAnambraState , Nigeria. The Bioscientists, 1(1): 54-59. Abajue MC, Ewuim SC &Akunne, CE 2014. Preliminary checklist of flies associated with pig carrions decomposition in Okija, Anambra State, Nigeria. Animal Res. Int., 11(1): 1899-1904. Abell D, Wasti SS & Hartmann GC 1982. Saprophagous arthropod fauna associated with turtle carrion. Applic.Entomol. Zool., 17: 301-307. Aggarwal AD 2005.Estimating the Postmortem Interval with the help of entomological evidence.Anil Aggrawal’s Internet J. Forensic Medicine &Toxicol., (6): 2 www.gerats.com/anil/ij/vol_006_no_002/main.html. Anderson GS 2000. Minimum and Maximum Development Rates Of Some Forensically Important Calliphoridae (Diptera). J. Forensic Sci., 45(4): 824-832. Anthon E, Niederegger S &BeutelRG 2011. Beetles and flies collected on pig carrion in an experimental setting in Thuringia and their forensic implications. J. Med. Vet. Entomol.,25(4): 353-364. Benecke M 1998. Random Amplifie Polymorphic DNA typing of Necrophagous Insects (Diptera: Coleoptera) in Criminal Forensic studies - Validation and Use in Practice. Forensic Sci. Int., 98: 157-168. Blackith RE &BkackithRM 1990. Insects’ infestations of small corpses. J. Natural History, 24: 699-709. Egborge ABM 1994. Water pollution in Nigeria: Biodiversity and chemistry of Warri River. Ben Miller Books Nigeria Limited, Warri, Nigeria, pp. 275-288. Ekanem MS & Dike MC 2010.Arthropods succession on pig carcasses in South Eastern Nigeria.PapeisAvulsos de Zoologia, 50(35): 561-570. EkanemMS &UsuaEJ 1997. Syanthropic non-biting flies (Diptera: Cyclorrhapha) of AkwaIbom State, Nigeria and their seasonal variations. Nig. J. Entomol., 14: 62-80. Ekrakene T &IlobaBN 2011.One death, many insect species, yet one insect generation.Journal ofEntom., 8: 27-39. Ewuim SC &Abajue MC 2016. Forensic Entomology in Nigeria: The Journry so far. Open Sci. J. Biosci. & Engr., 3(1): 1-4. GalalLAA, Abd-El-hameedSY&Attia RAH 2009. An initial study on arthropod succession on exposed human tissues in Assuit, Egypt. J. Forensic Med. Clin. Toxicol.,17(1): 55-74. Gennard DE 2007.Forensic Entomology: An introduction. Wiley, New York, 224pp. Greenberg B & Wells JA 1998. Forensic use of Megseliaabditaand M. Sealers (Phoridae: Diptera): Case studies, development rates and egg structure. J. Med.Entom., 35: 205-209. Keh B 1985. Scope and Application of Forensic Entomology.Annual Rev. Entom., 30: 137-154. Mearns AG 1939. Larval Infestation and Putrefaction: Recent Advances in Forensic Medicine.Smith KGV and Glaister J, Eds. Churchill Blakiston’s, Philadelphia. 1st ed, pp. 250-256. OkiweluSN, Umeozor OC, Noutcha MAE &NduezeOU 2013. Arthropods associated with wildlife carcasses in Lowland Rainforest, Rivers State, Nigeria. Euro. J. Exp. Bio., 3(5): 111-114. Richards EN & Goff ML 1997.Arthropods succession on exposed carrions in three contrasting tropical habitats on Hawaii Islands, Hawaii.Journal of Entomology, 34: 328-339. Sanaa MA, Wen J, Wang X, Cai J, Liu Q &Zhong M 2013.Identification of forensically important arthropods on exposed remains during summer season in northeastern Egypt.J. Central South University of Med. Sci., 38(1): 1-6. Slone D, Grunner S & Allen J 2005.Assessing Error in PMI Prediction Using a Forensic Entomological Computer Model.www.ncjrs.gov/pdfflies1/nij/grants/211760.pdf Shaumar N & Mohammad S 1983.Keys for identification of species of Family Sarcophagidae (Diptera) in Egypt.J. Bull. SocEntomol Egypt, 64: 121-135. Shaumar NF, Mohammad SK & Mohammad SA 1998.Keys for identification of species of family Calliphoridae (Ditpera) in Egypt.J. Egypt SocParasitol,19(2): 669-681. Shaumar NF, Mohammad SK & Salem NM 1990. Taxonomic studies of Dermestidae (Coleoptera) in Egypt. J. Bull. Soc. Entomol. Egypt, 69: 11-12. Tantawi TI, El-KadyEM& Greenberg B 1996.Arthropod succession on exposed rabbit carrion in Alexandria Egypt.J. Med Entomol.,33(4): 566-580. UsuaEJ 2007. Forensic entomology and humanity.Nig. J. Entomol., 24: 1-16.