Life-table analysis of Anopheles arabiensis in western Kenya highlands:: Effects of land covers on larval and adult survivorship
Life-table analysis of Anopheles arabiensis in western Kenya highlands:: Effects of land covers on larval and adult survivorship
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DOI：
10.4269/ajtmh.2007.77.660
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发表时间：
2007-10-01
影响因子：
3.3
通讯作者：
Yan, Guiyun
中科院分区：
文献类型：
--
作者：
Afrane, Yaw A.;Zhou, Goufa;Yan, Guiyun
在肯尼亚西部的高海拔地区，阿拉伯按蚊的丰度要么很低，要么根本没有。肯尼亚西部高地（海拔超过1 500米的地区）也经历了大规模的森林砍伐，森林砍伐被认为是促进疟疾在高地传播的重要因素之一。这项研究调查了肯尼亚西部高地（卡卡梅加，海拔1,500米）的气候条件是否允许An的发展和生存。以及森林砍伐是否促进了An.未成熟和成年阶段的生存率，使用生命表分析。结果表明，在森林地区的幼虫栖息地，只有4-9%的1龄幼虫发育成成虫，发育时间超过20天。结果表明，森林采伐区水生生境平均水温比森林采伐区高4.8-6.1 ℃，幼虫至成虫存活率提高65- 82%，幼虫至成虫发育时间缩短8-9 d。森林砍伐区的房屋平均室内温度比森林区高1.7-1.8摄氏度，相对湿度低22-25%。成蚊在森林砍伐区的平均存活时间比森林区高49-55%。雌蚊净繁殖率在森林采伐区比在森林采伐区高1.7 ~ 2.6倍。与此前公布的数据相比，gambiae的净繁殖率。阿拉伯按蚊在森林区仅占冈比亚按蚊的0.8-1.3%，在森林消失区仅占冈比亚按蚊的2.3-2.6%。因此，目前的环境气候条件对An不太允许。arabiensis比An.位于肯尼亚西部高地的冈比亚。然而，环境的变化，如森林砍伐和全球变暖可能会促进安。在高地的阿拉伯人。
In high-elevation areas in western Kenya, the abundance of Anopheles arabiensis is either very low or absent. The western Kenya highlands (an area with an elevation > 1,500 m above sea level) have also been experiencing extensive deforestation, and deforestation has been suggested as one of the important factors that facilitate malaria transmission in the highlands. This study investigated whether climate conditions in the western Kenya highlands (Kakamega, elevation 1,500 m above sea level) were permissive to the development and survival of An. arabiensis and whether deforestation promoted An. arabiensis survivorship of immature and adult stages, using life-table analysis. We found that in larval habitats located in forested areas, only 4-9% of first-instar larvae developed into adults and the development length exceeded 20 days. Mean water temperature of aquatic habitats in the deforested area was 4.8-6.1 degrees C higher than that in the forested area, larval-to-adult survivorship was increased to 65-82%, and larval-to-adult development time was shortened by 8-9 days. The average indoor temperature in houses in the deforested area was 1.7-1.8 degrees C higher than in the forested area, and the relative humidity was 22-25% lower. The median survival time of adult mosquitoes in the deforested area was 49-55% higher than those in the forested area. The net reproductive rate of female mosquitoes in the deforested area was 1.7- to 2.6-fold higher than that in the forested area. Compared with previously published data on An. gambiae, the net reproductive rate of An. arabiensis was only 0.8-1.3% of Anopheles gambiae in the forested area and 2.3-2.6% in the deforested area. Therefore, the current ambient climate condition is less permissive to An. arabiensis than to An. gambiae in western Kenya highlands. However, environmental changes such as deforestation and global warming may facilitate the establishment of An. arabiensis populations in the highlands.