Thermal limits of wild and laboratory strains of two African malaria vector species, Anopheles arabiensis and Anopheles funestus.
Thermal limits of wild and laboratory strains of two African malaria vector species, Anopheles arabiensis and Anopheles funestus.
复制标题
DOI：
10.1186/1475-2875-11-226
复制
发表时间：
2012-07-06
期刊：
影响因子：
3
通讯作者：
Chown SL
中科院分区：
文献类型：
--
作者：
Lyons CL;Coetzee M;Terblanche JS;Chown SL
疟疾影响着发展中国家的大部分地区，每年造成近 80 万人死亡。随着气候变化，人们开始担心这种媒介传播的疾病将如何受到降雨模式变化和气温变暖的影响。尽管气候变化对该疾病潜在传播的影响具有重要性并存在争议，但有关几种媒介物种本身耐受性的信息却很少。使用升温方案（评估临界热极限 - CT）和骤降方案（评估致死温度极限 - LT）收集了非洲两种重要疟疾病媒阿拉伯按蚊和福内斯按蚊的热耐受性信息。研究了年龄、热驯化处理、性别和应变（实验室与野生成虫）的影响，以对每个物种进行 CT 测定。研究了年龄和性别对成虫和生命阶段（幼虫、蛹、成虫）的影响，以测定 LT。在这两个物种中，雌性比雄性更能耐受低温和高温。幼虫和蛹的致死上限高于成虫。成虫的热适应在某些情况下影响较大，但在另一些情况下影响较小。年轻人往往比老年人更能忍受低温或高温。长期存在的实验室菌落在耐热性方面与野外采集的动物非常相似，可以在推断野生种群反应时提供合理的替代品。这两种媒介在耐热性方面的差异，尤其是幼虫和蛹，可能是不同栖息地利用的结果。相对于迄今为止检查的其他物种，这些媒介物种的成虫的可塑性有限，这表明热耐受性的代内变化范围有限。这些发现以及女性对极端高温的更大耐受性可能对未来的疟疾传播产生重大影响，特别是在当前季节性传播的地区和当前病媒分布边界的地区。
Malaria affects large parts of the developing world and is responsible for almost 800,000 deaths annually. As climates change, concerns have arisen as to how this vector-borne disease will be impacted by changing rainfall patterns and warming temperatures. Despite the importance and controversy surrounding the impact of climate change on the potential spread of this disease, little information exists on the tolerances of several of the vector species themselves. Using a ramping protocol (to assess critical thermal limits - CT) and plunge protocol (to assess lethal temperature limits - LT) information on the thermal tolerance of two of Africa’s important malaria vectors, Anopheles arabiensis and Anopheles funestus was collected. The effects of age, thermal acclimation treatment, sex and strain (laboratory versus wild adults) were investigated for CT determinations for each species. The effects of age and sex for adults and life stage (larvae, pupae, adults) were investigated for LT determinations. In both species, females are more tolerant to low and high temperatures than males; larvae and pupae have higher upper lethal limits than do adults. Thermal acclimation of adults has large effects in some instances but small effects in others. Younger adults tend to be more tolerant of low or high temperatures than older age groups. Long-standing laboratory colonies are sufficiently similar in thermal tolerance to field-collected animals to provide reasonable surrogates when making inferences about wild population responses. Differences between these two vectors in their thermal tolerances, especially in larvae and pupae, are plausibly a consequence of different habitat utilization. Limited plasticity is characteristic of the adults of these vector species relative to others examined to date, suggesting limited scope for within-generation change in thermal tolerance. These findings and the greater tolerance of females to thermal extremes may have significant implications for future malaria transmission, especially in areas of current seasonal transmission and in areas on the boundaries of current vector distribution.
登录
查看更多内容
影响因子：
2.8
作者：
Hoffmann, A. A.
通讯作者：
Hoffmann, A. A.
影响因子：
1.9
作者：
Hunt, RH;Brooke, BD;Coetzee, M
通讯作者：
Coetzee, M
影响因子：
2.2
作者：
Allen, Jessica L.;Clusella-Trullas, Susana;Chown, Steven L.
通讯作者：
Chown, Steven L.
热门话题还是空话？东非高原气候变化和疟疾死灰复燃。
影响因子：
9.6
作者：
Hay SI;Rogers DJ;Randolph SE;Stern DI;Cox J;Shanks GD;Snow RW
通讯作者：
Snow RW
影响因子：
16.8
作者：
Harshman, LG;Hoffmann, AA
通讯作者：
Hoffmann, AA