Senthamarai Selvan P, Jebanesan A, Reetha D
Division of Vector Biology, Department of Zoology, Annamalai University, Annamalainagar 608 002, India.
Division of Vector Biology, Department of Zoology, Annamalai University, Annamalainagar 608 002, India.
Acta Trop. 2016 Jul;159:69-82. doi: 10.1016/j.actatropica.2016.03.029. Epub 2016 Mar 22.
The distribution and abundance of various mosquito vectors is important in the determination of disease prevalence in disease endemic areas. The aim of the present study was to conduct regular entomological surveillance and to determine the relative abundance of tree hole mosquito species in Tamilnadu, India. In addition to this, the impact of weather-conditions on tree hole mosquito population were evaluated between June, 2014 and May, 2015. Six hills ranges viz., Anaimalai hills, Kodaikanal hills, Sitheri hills, Kolli hills, Yercaud hills, and Megamalai were selected, the immatures collected from tree holes by the help of suction tube. Collections were made at dusk and dawn at randomly selected 15 different tree species. The collected samples were stored and morphologically identified to species level in the laboratory. Mosquito diversity was calculated by Simpson's and Shannon-Weiner diversity indicies with spatial and temporal aspects. Over 2642 mosquitoes comprising the primary vectors of dengue, chickungunya, malaria, filariasis were identified. Other species collected from the fifteen sites in each hill during the study included Christophersiomyia annularis, Christophersiomyia thomsoni, Downsiomyia albolateralis, Downsiomyia nivea and Toxorhynchites splendens, etc. Study revealed high species diversity and relative density associated with different study sites. Based on the Shannon diversity index high number of species was recorded with Aedes pseudoalbopicta (0.0829) followed by Ae. aegypti (0.0805) and least species was recorded as Anopheles elegans (0.0059). The distribution of the primary vectors of DF along the high occurrence was evident with most study sites representing proportions of this vector population. This showed the high risk level associated with the livestock movement in amplification and circulation of the virus during the outbreaks. The findings of this study, therefore, demonstrated the potential vulnerability of nomadic communities to infection by arboviral diseases transmitted by mosquito vectors.
在疾病流行地区，各种蚊虫媒介的分布和数量对于确定疾病流行程度至关重要。本研究的目的是在印度泰米尔纳德邦开展定期昆虫学监测，并确定树洞蚊种的相对数量。除此之外，还评估了2014年6月至2015年5月期间天气条件对树洞蚊种群的影响。选择了六个山脉，即阿奈马莱山、科代卡纳尔山、西泰里山、科利山、耶尔卡德山和梅加马莱山，借助吸管从树洞收集未成熟蚊虫。在黄昏和黎明时分，从随机选择的15种不同树种的树洞中进行采集。收集的样本在实验室中储存并进行形态学鉴定至物种水平。通过辛普森多样性指数和香农-韦纳多样性指数从空间和时间方面计算蚊虫多样性。共鉴定出超过2642只蚊子，它们是登革热、基孔肯雅热、疟疾、丝虫病的主要传播媒介。在研究期间，从每个山脉的15个地点收集到的其他蚊种包括环纹克里斯托弗按蚊、汤姆森克里斯托弗按蚊、白侧唐西按蚊、雪白唐西按蚊和华丽巨蚊等。研究表明，不同研究地点的物种多样性和相对密度较高。根据香农多样性指数，伪白纹伊蚊的物种数量最多（0.0829），其次是埃及伊蚊（0.0805），而优雅按蚊的物种数量最少（0.0059）。大多数研究地点的登革热主要传播媒介的分布呈现出高发生率，这表明在疫情爆发期间，牲畜移动在病毒扩增和传播过程中具有较高风险。因此，本研究结果表明游牧社区易受蚊媒传播的虫媒病毒疾病感染。
