Thierry Djepand-Ngognouak, Djamouko-Djonkam Landre, Gisèle Foko Dadji, Audrey Mayi Marie Paul, Timoléon Tchuinkam, Serge Hubert Zébazé-Togouet, Sinclair Wondji Charles, Christophe Antonio-Nkondjio
Malaria Research Laboratory, Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale (OCEAC), P.O. Box 288, Yaoundé, Cameroon.
Faculty of Science, University of Yaoundé I, P.O. Box 337, Yaoundé, Cameroon.
Heliyon. 2023 Jul 8;9(8):e17723. doi: 10.1016/j.heliyon.2023.e17723. eCollection 2023 Aug.
There has been a renewed interest for larviciding during the recent decade. Although biological larvicides are considered not to be harmful to non-target organisms, there is still not sufficient data on the effect of new long-lasting larvicide formulations such as VectoMax G combining and on the environment especially on non-target organisms. The present study aimed to assess the possible influence of VectoMax G on the diversity and abundance of the aquatic fauna cohabiting with mosquito larvae in breeding habitats during a larviciding trial in the city of Yaoundé. Twelve districts of the city of Yaoundé divided into 6 intervention and 6 control sites were chosen for the study. In each district 4 semi-permanent or permanent aquatic habitats were followed. VectoMax G application was done once every two weeks during 6 months and aquatic organisms were collected 48 h after each treatment. All collected organisms were brought to the laboratory for identification. Physico-chemical parameters were recorded as well. A high diversity of the zooplankton was recorded in the intervention areas with 28 species collected against 14 species in the control areas. Cladocerans were the most represented group in both sites while Ostracods were found only in control sites. A total of 19 macro-invertebrates species were recorded in the control areas vs 16 species in the intervention areas. Gasteropods were the most represented groups of macro-invertebrates. Vertebrates such as larvivorous fishes and amphibians larvae were also found in approximately similar densities in both sites. The study indicated no significant influence of larviciding with VectoMax G on the diversity and abundance of the non-target aquatic fauna in the city of Yaoundé.
在最近十年里，人们对杀幼虫剂重新产生了兴趣。尽管生物杀幼虫剂被认为对非目标生物无害，但关于新型长效杀幼虫剂配方（如结合了[具体成分1]和[具体成分2]的VectoMax G）对环境尤其是对非目标生物的影响，仍然没有足够的数据。本研究旨在评估在雅温得市进行的一次杀幼虫试验中，VectoMax G对与蚊虫幼虫共生于繁殖栖息地的水生动物多样性和丰度的可能影响。选择雅温得市的12个区，分为6个干预区和6个对照区进行研究。在每个区跟踪4个半永久性或永久性水生栖息地。在6个月内每两周施用一次VectoMax G，并在每次处理后48小时收集水生生物。所有收集到的生物都被带到实验室进行鉴定。同时记录理化参数。在干预区记录到浮游动物的多样性很高，共收集到28个物种，而对照区为14个物种。枝角类在两个区域都是最具代表性的类群，而介形类仅在对照区发现。对照区共记录到19种大型无脊椎动物，干预区为16种。腹足纲是大型无脊椎动物中最具代表性的类群。在两个区域中，食蚊鱼类和两栖类幼虫等脊椎动物的密度也大致相似。该研究表明，在雅温得市使用VectoMax G进行杀幼虫处理对非目标水生动物的多样性和丰度没有显著影响。
