Laboratoire de Biologie Moléculaire et Cellulaire, Département de Biologie, Université des Sciences et Techniques de Masuku, Franceville, Gabon.
Unité de Recherche en Écologie de la Santé, Centre Interdisciplinaire de Recherches Médicales de Franceville, Franceville, Gabon.
PLoS Negl Trop Dis. 2023 Aug 16;17(8):e0011501. doi: 10.1371/journal.pntd.0011501. eCollection 2023 Aug.
Since its first record in urban areas of Central-Africa in the 2000s, the invasive mosquito, Aedes albopictus, has spread throughout the region, including in remote villages in forested areas, causing outbreaks of Aedes-borne diseases, such as dengue and chikungunya. Such invasion might enhance Ae. albopictus interactions with wild animals in forest ecosystems and favor the spillover of zoonotic arboviruses to humans. The aim of this study was to monitor Ae. albopictus spread in the wildlife reserve of La Lopé National Park (Gabon), and evaluate the magnitude of the rainforest ecosystem colonization.
From 2014 to 2018, we used ovitraps, larval surveys, BG-Sentinel traps, and human landing catches along an anthropization gradient from La Lopé village to the natural forest in the Park.
We detected Ae. albopictus in gallery forest up to 15 km away from La Lopé village. However, Ae. albopictus was significantly more abundant at anthropogenic sites than in less anthropized areas. The number of eggs laid by Ae. albopictus decreased progressively with the distance from the forest fringe up to 200m inside the forest. Our results suggested that in forest ecosystems, high Ae. albopictus density is mainly observed at interfaces between anthropized and natural forested environments. Additionally, our data suggested that Ae. albopictus may act as a bridge vector of zoonotic pathogens between wild and anthropogenic compartments.
自 21 世纪初首次在中非城市地区记录以来，入侵蚊子白纹伊蚊已传播到该地区，包括森林地区的偏远村庄，导致登革热和基孔肯雅热等由伊蚊传播的疾病暴发。这种入侵可能会增强白纹伊蚊与森林生态系统中野生动物的相互作用，并有利于人畜共患的虫媒病毒向人类溢出。本研究旨在监测加蓬拉洛佩国家公园（La Lopé National Park）野生动物保护区中白纹伊蚊的传播情况，并评估热带雨林生态系统的殖民化程度。
从 2014 年到 2018 年，我们沿着从拉洛佩村到公园自然森林的人为化梯度，使用诱卵器、幼虫调查、BG-Sentinel 诱捕器和人体诱捕器进行监测。
我们在距离拉洛佩村 15 公里的长廊林中检测到了白纹伊蚊。然而，白纹伊蚊在人为环境中的数量明显多于人为干扰较少的地区。白纹伊蚊产卵的数量随着距离森林边缘的增加而逐渐减少，在森林内部可达 200 米。我们的研究结果表明，在森林生态系统中，高浓度的白纹伊蚊主要出现在人为化和自然森林环境的交界处。此外，我们的数据表明，白纹伊蚊可能是野生和人为环境之间人畜共患病原体的桥梁媒介。
