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首页> 外文期刊>Lakes & Reservoirs >Relative abundance of mosquitoes and snails associated with water hyacinth and hippo grass in the Nyanza gulf of Lake Victoria
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Relative abundance of mosquitoes and snails associated with water hyacinth and hippo grass in the Nyanza gulf of Lake Victoria

机译：维多利亚湖Nyanza海湾与水葫芦和河马草相关的蚊子和蜗牛的相对丰富

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This study was conducted from September to December 2008 to investigate the relative abundance of malaria vectors and schistosomiasis host snails associated with aquatic weeds in Nyanza Gulf (Lake Victoria). Larval and adult's stages of mosquitoes, lakeflies and snails were collected and identified with standard entomological and malacological techniques. The relative species composition and abundance of fish associated with macrophytes were also determined. Physico-chemical parameters were determined with standard analytical methods. Community-based surveys were also conducted, using standard questionnaires, focused group discussions and direct observations. The results of this study indicated that the abundance of malaria-causing mosquitoes was low, accounting for only 0.4% of the total number of mosquitoes and lake flies collected from the gulf. Lake flies (Chaoborus and Chironomus spp.) were the most abundant flying insects associated with aquatic macrophytes (84.2%), followed by Culicines Culex spp. (12.2%) and Aedes spp. mosquitoes (3.2%). Biomphalaria sudanica and Bulinus africanus, the two most common hosts for schistosomiasis in the gulf, were detected in both types of macrophytes, but were most significantly attached to water hyacinth (P < 0.0001) and hippo grass (P = 0.0003). There were significantly fewer snails attached to the hippo grass, compared with those unattached in the open water (P< 0.05, GENMOD). Different habitats exhibited low Secchi disc transparency values, but elevated total phosphorous (TP), total nitrogen (TN), chlorophyll-a concentrations, as well as algal cell counts. Furthermore, Oreochr-omis niloticus and Haplochromine fishes were more abundant in water hyacinth mats compared with hippo grass mats and open-water habitats. The low mosquito abundance indicated that the sampled habitats were unsuitable for mosquito breeding, likely attributable to water turbulence and/or predation by larvivorous fish. The strong association between B. sudanica and B. africanus and aquatic macrophytes, and the observation that local communities perform many lake-shore-related activities that bring them into contact with water, can potentially lead to a higher prevalence of schistosomiasis in the Nyanza Gulf region.
机译：这项研究于2008年9月至12月进行，以调查与Nyanza海湾（维多利亚湖）水生杂草有关的疟疾媒介和血吸虫病寄主蜗牛的相对丰度。收集幼虫和成虫的蚊子，湖蝇和蜗牛的阶段，并用标准的昆虫学和乳病学技术对其进行鉴定。还确定了与大型植物相关的鱼类的相对物种组成和丰富度。用标准分析方法确定理化参数。还使用标准问卷，重点小组讨论和直接观察进行了基于社区的调查。这项研究的结果表明，引起疟疾的蚊子数量很低，仅占从海湾收集的蚊子和湖蝇总数的0.4％。湖蝇（Chaoborus和Chironomus spp。）是与水生植物相关的飞行昆虫最多的一种（84.2％），其次是Culicines Culex spp。 （12.2％）和伊蚊属。蚊子（3.2％）。在两种类型的大型植物中均检测到了苏丹海湾血吸虫病的两个最常见寄主苏丹草（Biomphalaria sudanica）和非洲野牛（Bulinus africanus），但它们与水葫芦（P <0.0001）和河马草（P = 0.0003）的连接最为明显。与未开阔水域中未附着的蜗牛相比，附着在河马草上的蜗牛明显更少（P <0.05，GENMOD）。不同的生境显示出较低的Secchi圆片透明度值，但总磷（TP），总氮（TN），叶绿素a浓度以及藻类细胞计数升高。此外，与河马草垫和开阔水域的栖息地相比，水葫芦垫中的鱼类更丰富。低的蚊子丰度表明，采样的栖息地不适合蚊子繁殖，可能是由于水湍流和/或幼虫鱼的捕食。苏丹双歧杆菌和非洲双歧杆菌与水生植物之间的紧密联系，以及当地社区进行许多与水接触的与湖岸有关的活动的观察结果，有可能导致Nyanza海湾血吸虫病的流行区域。

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