Modelling habitat and spatial distribution of the edible insectHenicus whellani Chop (Orthoptera: Stenopelmatidae) in south-eastern districts of Zimbabwe

Abstract

Edible insects present unique opportunities for food and nutrition security in many African communities. However, the characteristics of habitats and spatial distribution of edible insects is not known and yet it is important for understanding their ecology, planning harvesting and conservation activities in the wild. The edible ground cricket (Henicus whellani) Chopard (Orthoptera: Stenopelmatidae) is an edible insect consumed in south eastern Zimbabwe with protein content >50% on dry matter basis but harvesting is largely random and opportunistic. The aim of this study was to apply the Maximum Entropy (MaxEnt) presence-only species distribution modelling approach to understand the factors influencing distribution ofH. whellani and map the potential areas for harvesting and conservation of the species. Geographical locations of sites whereH. whellani is currently present were obtained from field reports from communities. Seven geographical factors which are mean annual temperature, temperature seasonality, mean annual precipitation, seasonality of precipitation, soil type, elevation, vegetation density and land cover were used to run the model. The model showed a high prediction accuracy forH. whellani (AUC=0.86) indicating that the model can be used with confidence to predict distribution and potential habitats in S.E Zimbabwe. Results showed that soil type (46.7%) and vegetation density (17.5%) are the most important factors determining the distribution ofH. whellani. The hotspots forH. whellani were identified and closely followed specific soil and vegetation gradients in the area. The model considered temperature (3.9%) and elevation (0.6%) as the least important factors inH. whellani distribution. The produced distributed maps can be used for planning efficient harvesting and conservation of this nutritious edible insect in Zimbabwe.