Effect of Antiparasitic Management of Cattle on the Diversity and Functional Structure of Dung Beetle (Coleoptera: Scarabaeidae) Assemblages in the Colombian Caribbean

Abstract

The transformation of forests into agricultural and livestock systems negatively affects the ecological dynamics and the ecosystem services provided by different groups of insects, including dung beetles, which stand out for their importance in recycling livestock dung. Since the 1980s, farmers in different regions of the world have been using Ivermectin to control parasites that affect cattle. The main route of elimination of this molecule and its metabolites is through manure, which affects the richness, abundance, and biomass of dung beetles when they use dung from treated animals. To quantify this effect, we carried out an experimental design in the field in the Colombian Caribbean, where nine cattle farms were evaluated, of which three were taken for each of the different cattle management practices most used in the region: (i) Ivermectin not applied, (ii) two doses of Ivermectin at 1% applied per year and (iii) two doses of Ivermectin at 3.15% applied per year. To assess the richness, abundance, biomass, and functional groups of dung beetles, during the dry and wet seasons, 30 pitfall traps were baited on each farm with fresh cattle manure with the same management doses described above. A total of 25,441 individuals belonging to 19 genera and 30 species were collected. The richness, abundance, and biomass of beetle assemblages decreased along the gradient represented by management without using Ivermectin and management where Ivermectin was used. Paracoprid beetles were the functional group that was most negatively affected in cattle farms with Ivermectin use. In cattle farms where Ivermectin was not used, there was a greater diversity and higher functional structure of dung beetle assemblages than in those where this veterinary medicinal product was used. Using Ivermectin generates short- and long-term effects on the richness, abundance, biomass, and functional groups of dung beetles in livestock systems in the Colombian Caribbean. Therefore, we suggest using integrated treatment management to prevent the recycling fauna from being affected.

Gut microbiota diversity in a dung beetle (Catharsius molossus) across geographical variations and brood ball-mediated microbial transmission

“…Moreover, we learned that the cattle farm regularly administers vaccines and antibiotics to the cattle. These drug residues may be excreted with the manure, thus affecting the growth and development of the beetles [ 53 , 54 ]. Research also indicates that genetically modified Bt plants affect the types of beetles in the food chain, reducing the presence of dung-rolling and burrowing beetles, thereby impairing abilities like manure removal, seed dispersal, and soil aeration, which in turn affects the local ecology [ 55 – 57 ].…”

Does Faeces Excreted by Moxidectin-Treated Sheep Impact Coprophagous Insects and the Activity of Soil Microbiota in Subtropical Pastures?

“…In addition, most studies on the impact of anthelmintics on the environment have been conducted in the Northern Hemisphere. In the Southern Hemisphere, studies in Argentina have shown negative effects of ivermectin, doramectin, and selamectin on the colonization, dispersal, and number of insects in the faecal bolus of cattle exposed to the environment [ 18 – 20 ]; Tovar et al, [ 21 , 22 ], but moxidectin was not studied. Thus, there is an unfilled gap on the effect of moxidectin residue in faeces on pasture and the present study intends to contribute with information for a better understanding of this phenomenon.…”