Effect of height to ground level on the insect attraction to exposed rabbit carcasses

Aim: The present study aimed to determine the effect of height from ground on the colonization of carrion insect species.Methodology: Rabbit (Oryctolagus cuniculus L.) carcasses were positioned at two different heights with respect to ground level in Riyadh, Saudi Arabia to determine populations of carrion insects at different decomposition stages. Steel cages were used to defiend the carcasses from flesh eating vertebrates without effecting surrounding environmental condition. Ambient temperatures and the patterns of insect succession were monitored at both heights Results: In total, 14 and 18 different carrion-associated taxa were collected at low and high sites, respectively. The primary and dominant necrophagous colonizer was the muscid dipteran Musca calleva (Walker) at low site and M. domestica (L.) at high site. The dominant beetle species at both sites was Dermestes maculatus (De Geer). The dominant ant species at low site were Cataglyphis holgerseni (Collingwood & Agosti) and Ca. savignyi (Dufour) and Camponotus sericeus (Fabricius) at high site. Interpretation: This research verified that the height of carrion in relation to ground level considerably affected the variety of insect species, particularly flies and beetles

Genetic diversity of termites from Ta'if City, Saudi Arabia

Aim: In Saudi Arabia, termites are considered as notorious pests that cause enormous damage in both rural and urban areas. The diversity of termites collected from various locations in Ta'if City were characterized, based on the mitochondrial genes mt12S rRNA, mtCOI and mtCOII. Methodology: Termite samples were manually collected during the spring of 2016 from different areas. Five different areas were surveyed to cover all regions of Ta'if City. Molecular identification method was applied to study genetic diversity of termite. Results: A total of 2229 termites were identified as eight species from three families on the basis of best gene (mt12S rRNA). Microcerotermes sp. was the most abundant species, whereas Angulitermes sp. was the least abundant with 0.8% representation. Anacanthotermes ochraceus and Microtermes sp. showed the least amount of intraspecific variation, the two species being 100% identical. Microcerotermes arboreus showed the highest intraspecific variation, ranging from 0.0% to 4.0%. Interspecific variability between the collected and identified species ranged from 7% to 21%. Interpretation: The results indicated the presence of eight different species of termites and the possibility of three new species based on genetic data.

Species richness of scavenger insects on different carcass types

@#The type and amount of resources available significantly influences the structure and dynamics of food webs. In this study, we analyzed differences in species richness of scavengers based on carcass type in Riyadh, Saudi Arabia. We collected insects from experimental carcasses of three different types, domestic dogs (Canidae, Canis lupus familiaris), Hijazi goats (Bovidae, Capra aegagrus hircus), and camels (Camelidae, Camelus dromedarius). Data collection was conducted during the decay stage in June, 2016. We used mitochondrial cytochrome c oxidase subunit I (mtCOI) barcodes as a marker for the molecular identification of the scavenger insects. The results showed that there were more insects on the camels and goats than the dogs. In total, seven species were found on all carrions. Six species were found on the camels and goats, but only five were found on the dog. Musca domestica was the most collected species of flies whereas, Necrobia rufipes was the most collected species of beetles. Overall, this study showed that carrion type had an effect on the type and number of insects attracted to the carrions. Thus, one of the significant factors that influence the associated scavenger assemblage is a carcass type.