Article InfoThe aim of this work was to demonstrate the existence of a diverse necrophagous entomological fauna and the order in which these insects appear to colonize a decaying corpse in the open air in the southern forest zone of Côte d'Ivoire. At the three sites selected in the city of Abidjan, Calliphoridae Diptera (1058±129.73 individuals trapped), Sarcophagidae (317.33±14.38) and Muscidae (152.33±11.46), occurring between the 1st and 14th post mortem days, were the first group of insects that colonized the exposed pig carcasses. Between the 14th and the 28th day post mortem, a second group mainly composed of Piophilidae Diptera (767±87.30 individuals harvested) and Coleoptera belonging to the Cleridae (803.33±73.64) and Histeridae families(15.67±1.85), appeared. The family of Stratiomyidae (339.67±49.76 individuals trapped) occurred between the 35th and 42nd post mortem days. These formed with the Piophilidae and the Cleridae, the third group that stayed until the 91st day post mortem. During the advanced decomposition phase, the Coleoptera Dermestidae, Tenebrionidae and Trogiidae appeared. They were added to the necrophagous insects of the third group to constitute the fourth group.The identification of the necrophagous Diptera trapped, made it possible to note the preponderance of the genera Piophila spp. and Chrysomya spp. They represented for 29.12% and 26.57% respectively of the total number of Diptera trapped. The least represented genera were Musca spp. and Calliphora spp. with 5.78% and 3.45% of the total number of Diptera harvested. For Coleoptera, the Cleridae family was the most represented with 91.01% of the total number of individuals harvested at the three sites.As part of an entomological assessment to date a death, these first results give an overview of the entomological fauna existing in the Guinean zone of Côte d'Ivoire and the way it gradually colonizes, a corpse exposed to the outdoors.
A decaying cadaver is particularly attractive to necrophagous insects, more specifically Diptera. These are the first to lay their eggs on corpses. For the post mortem interval determination, the entomologist needs to know the precise time of the first egg-laying. The objective of this study is to determine the egg laying delay of these insects on a cadaver exposed in different conditions in the Guinean zone of Côte d'Ivoire. To do this, our work was been carried out in a natural environment at the National Agronomic Research Center. The experimental setup consisted of four types of wire mesh cages corresponding to the following cases: cadavers exposed to the open air or control cadavers, semi-immersed cadavers, cadavers wrapped in a shroud and suspended cadavers. Work on the site has been made from 29 October to 5 November 2019. The spawning period in species of Calliphoridae, was shorter on control and suspended cadavers. In Sarcophagidae, we noted a larviposition late on the suspended cadavers. Muscidae and Fanniidae, which intervened later on the decomposing corpses, were not observed on the suspended cadavers. These carcasses quickly dried out, no longer being able to provide nutrients essential for the proper development of larvae of species of these Diptera families. Depending on the accessibility of the corpses to necrophagous insects, the first egg-laying of Diptera were observed after 6 hours of exposure and the last after 174 hours. The exposure conditions of the corpses significantly influenced the time taken to lay the main necrophagous Diptera. As the first egg-laying of the flies occurs in the first moments after death, as long as the corpses is accessible, the results obtained during these experiments should be taken into account by the expert entomologist, in the estimation of the interval post-mortem upon discovery of a corpse.
Theobroma cacao, Insects, Stocks of cocoa beans, Diversity, Côte d'Ivoire. Cocoa storage is a potential opportunity for insect infestation. The objective of this study was to identify insects and assess their damage to stored cocoa beans from the Haut-Sassandra region. To do this, 3 samples of 3 Kg of cocoa beans were collected per locality. These samples were stored for 30 days in jute bags. After this month of storage, each sample was sieved every 15 days in a muslin observation cage for 120 days. The living or dead adults collected in each lot were observed with a binocular magnifying glass, counted and identified using manuals. The livings are returned to the batches from which they were removed. For the estimation of the damage, three samples of 1 kg cocoa beans without holes were made and followed for 120 days. Counting after sieving revealed the presence of 876 individuals divided into 2 orders, 10 families and 12 species. The most abundant species was Ahasverus advena (24.89%) followed by Tribolium castaneum with 18.38% presence. The estimated damage caused by insects to cocoa beans was 26.88% at the 120th day of storage.
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