Comparison of socio-ecological and economic impact and control techniques of the invasive Indian house crow (Corvus splendens) and the red-billed quelea (Quelea quelea) in Africa: a scoping review

Abstract

Both invasive and native species can significantly influence socio-ecological and economic systems. The Indian House Crow (IHC; Corvus splendens) and the Red-billed Quelea (RBQ; Quelea quelea) are invasive and native species in Africa, respectively. Both species are known for their substantial socio-ecological and economic effects; however, limited studies have directly compared them. This study aims to compare the impacts of IHC and RBQ, evaluate their control and management strategies, and examine awareness and attitudes toward these species. Through a scoping review, we identified relevant studies meeting the inclusion criteria and synthesized evidence on socio-ecological and economic impacts, control measures, and community awareness and attitudes. Data were collected from Google-Scholar, Scopus, and EBSCOhost and evaluated following PRISMA guidelines, and analysed through descriptive and thematic methods. The results indicate that RBQ has a higher frequency (73%, n = 59) of studies, most of which address the economic aspects and control measures, while IHC has fewer but more diverse studies across multiple socio-ecological and economic areas. No studies have reported hybridization or brood parasitism for these species in Africa. Control strategies have evolved from traditional approaches to modern techniques capitalizing on technological advancement. Overall, both species are widely regarded as pests, causing substantial economic losses as well as significant social-ecological impacts. To date, existing control measures remain insufficiently effective. The study underscores the differing impacts of IHC and RBQ, highlights key research gaps such as the need for more studies in attitude and perception towards these species, and advocates for improved and sustainable management strategies.