Presence and distribution of mosquito larvae predators and factors influencing their abundance along the Mara River, Kenya and Tanzania
Presence and distribution of mosquito larvae predators and factors influencing their abundance along the Mara River, Kenya and Tanzania
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DOI：
10.1186/s40064-015-0905-y
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发表时间：
2015-03-20
期刊：
影响因子：
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通讯作者：
Ofulla, Ayub V. O.
中科院分区：
文献类型：
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作者：
Dida, Gabriel O.;Gelder, Frank B.;Ofulla, Ayub V. O.
在所有控制疟疾的措施中，蚊子幼虫的生物控制可能是最便宜和最容易实施的。本研究调查了马拉河沿着大型无脊椎动物捕食者对幼蚊的捕食基线，确定了捕食者和蚊幼虫栖息地的多样性及其对水体理化参数的适应能力范围。2011年7月至8月，采样点（n=39）沿着马拉河被选中，并调查大型无脊椎动物捕食者和蚊子幼虫的存在。对选定的采样点进行地理编码，每个采样点使用标准蚊幼虫勺蘸取20次蚊幼虫样本，同时使用D形框架蘸网捕获大型无脊椎动物捕食者。水的物理化学参数（溶解氧、温度、pH值、电导率、盐度和浊度）在接入点现场测量，硬度和碱度则通过滴定法测量。利用广义线性模型（GLM）将大型底栖动物捕食性天敌发生的影响与蚊幼虫和水质参数进行了相关分析。捕食性天敌297只，其中半翅目（54.2%）、蜻蜓目（22.9%）、鞘翅目（22.9%）3个目;冈比亚库蚊（44.9%）; (34.8%）和一个。Coustani复合群（13.8%）、An.斑须按蚊3.6%; phaorensis（1.2%），An.死亡组（0.5%）; azaniae（0.4%）、阿氏按蚊（An. hamoni（0.3%），An. christyi（0.3%）、安氏隐翅虫（An. ardensis（0.08%）、安氏按蚊（An. faini（0.07%）、安.从马拉河沿着不同生境中捕获的斑蚊幼虫中，有0.05%和0.05%的斑蚊幼虫由于缺乏合适的检索表而未能鉴定到种的水平。研究表明，大型无脊椎动物捕食者入侵栖息地的部分原因是蚊子幼虫的存在（p < 0.001），以及主要的水物理化学参数（DO，温度和浊度，p <0.001）。
Among all the malaria controlling measures, biological control of mosquito larvae may be the cheapest and easiest to implement. This study investigated baseline predation of immature mosquitoes by macroinvertebrate predators along the Mara River, determined the diversity of predators and mosquito larvae habitats and the range of their adaptive capacity to water physico-chemical parameters. Between July and August 2011, sampling sites (n=39) along the Mara River were selected and investigated for the presence of macroinvertebrate predators and mosquito larvae. The selected sampling sites were geocoded and each dipped 20 times using standard mosquito larvae dipper to sample mosquito larvae, while a D-frame dip net was used to capture the macroinvertebrate predators. Water physico-chemical parameters (dissolved oxygen, temperature, pH, conductivity, salinity and turbidity) were taken in situ at access points, while hardness and alkalinity were measured titrimetically. The influence of macroinvertebrate predator occurrence was correlated with mosquito larvae and water quality parameters using Generalized Linear Model (GLM). Predators (n=297) belonging to 3 orders of Hemiptera (54.2%), Odonata (22.9%) and Coleoptera (22.9%), and mosquito larvae (n=4001) belonging to 10 species, which included An. gambiae s.l (44.9%), Culex spp. (34.8%) and An. coustani complex (13.8%), An. maculipalpis (3.6%), An. phaorensis (1.2%), An. funestus group (0.5%), An. azaniae (0.4%), An. hamoni (0.3%), An. christyi (0.3%), An. ardensis (0.08%), An. faini (0.07%), An. sergentii (0.05%) and 0.05% of Aedes mosquito larvae which were not identified to species level, due to lack of an appropriate key, were captured from different habitats along the Mara river. It was established that invasion of habitats by the macroinvertebrate predators were partially driven by the presence of mosquito larvae (p < 0.001), and the prevailing water physico-chemical parameters (DO, temperature, and turbidity, p