Department of Medical Entomology and Vector Control, School of Public Health, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
Asian Pac J Trop Med. 2013 Jul;6(7):510-5. doi: 10.1016/S1995-7645(13)60087-5.
To determine the effects of environmental parameters of larval habitats on distribution and abundance of anopheline mosquitoes in Rudan county of Iran.
This cross-sectional study was conducted during the mosquito breeding season from February 2010 to October 2011. The anopheline larvae were collected using the standard dipping method. The specimens were identified using a morphological-based key. Simultaneously with larval collection, environmental parameters of the larval habitats including water current and turbidity, sunlight situation, and substrate type of habitats were recorded. Water samples were taken from breeding sites during larval collection. Before collection of samples, the water temperature was measured. The water samples were analysed for turbidity, conductivity, total alkalinity, total dissolved solid, pH and ions including chloride, sulphate, calcium, and magnesium. Statistical correlation analysis and ANOVA test were used to analyze the association between environmental parameters and larval mosquito abundance.
In total 2 973 larvae of the genus Anopheles were collected from 25 larval habitats and identified using morphological characters. They comprised of six species: An. dthali (53.21%), An. stephensi (24.22%), An. culicifacies (14.06%), An. superpictus (4.07%), An. turkhudi (3.30%), and An. apoci (1.14%). The most abundant species was An. dthali which were collected from all of the study areas. Larvae of two malaria vectors, An. dthali and An. stephensi, co-existed and collected in a wide range of habitats with different physico-chemical parameters. The most common larval habitats were man-made sites such as sand mining pools with clean and still water. The anopheline mosquitoes also preferred permanent habitats in sunlight with sandy substrates. The results indicated that there was a significant relationship between mean physico-chemical parameters such as water temperature, conductivity, total alkalinity, sulphate, chloride, and mosquito distribution and abundance.
The results of this study showed a correlation between certain environmental parameters and mosquito larvae abundance, and these parameters should be considered in planning and implementing larval control programs.
确定伊朗鲁丹县幼虫栖息地的环境参数对按蚊分布和丰度的影响。
本横断面研究于 2010 年 2 月至 2011 年 10 月蚊虫滋生季节进行。采用标准浸提法采集按蚊幼虫。采用基于形态的关键方法对标本进行鉴定。同时采集幼虫时，记录幼虫栖息地的环境参数，包括水流和浊度、阳光情况和栖息地的基质类型。在幼虫采集期间从繁殖地采集水样。采集样品前，测量水的温度。对水样进行浊度、电导率、总碱度、总溶解固体、pH 值和氯离子、硫酸盐、钙和镁等离子分析。采用统计相关分析和方差分析检验来分析环境参数与幼虫蚊丰度之间的关系。
从 25 个幼虫栖息地共采集到 2973 只按蚊属幼虫，并通过形态特征进行了鉴定。它们包括六个物种：安氏疟蚊（53.21%）、斯蒂芬斯按蚊（24.22%）、库蚊（14.06%）、斑蚊（4.07%）、土库曼按蚊（3.30%）和阿波西按蚊（1.14%）。最丰富的物种是安氏疟蚊，它们存在于所有研究区域。两种疟疾媒介的幼虫，即安氏疟蚊和斯蒂芬斯按蚊，共同存在并在具有不同理化参数的广泛栖息地中采集。最常见的幼虫栖息地是人工场所，如采砂池，那里的水清洁且静止。按蚊也更喜欢阳光充足、沙质基质的永久性栖息地。结果表明，某些理化参数（如水温、电导率、总碱度、硫酸盐、氯化物）与蚊子的分布和丰度之间存在显著关系。
本研究结果表明，某些环境参数与蚊子幼虫丰度之间存在相关性，在规划和实施幼虫控制计划时应考虑这些参数。
