Larval competition differentially affects arbovirus infection in Aedes mosquitoes
Larval competition differentially affects arbovirus infection in Aedes mosquitoes
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DOI：
10.1890/05-0209
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发表时间：
2005-12-01
期刊：
影响因子：
4.8
通讯作者：
Juliano, SA
中科院分区：
文献类型：
--
作者：
Alto, BW;Lounibos, LP;Juliano, SA
密度介导和性状介导的间接生物相互作用在群落结构中可能都很重要。许多研究系统中的间接相互作用仍未被探索；部分原因是，它们往往难以发现，而且在许多情况下，只有在出现意想不到的结果时，才能根据经验加以识别。在具有复杂生命周期的生物体中，竞争引起的间接效应可能特别重要，其中在一个生命阶段经历的竞争效应会影响一个或多个后续阶段的物种相互作用。我们确定了白纹伊蚊和埃及伊蚊幼虫竞争的物种特异性效应是否在成虫阶段有间接影响，特别是测试了对Sindbis病毒（SINV）虫媒病毒感染的影响。与低竞争条件相比，竞争导致白纹伊蚊的感染率、体滴度和传播率更高，而埃及伊蚊则不然。与竞争无关，病毒的全身滴度随成虫体型的增大而增加。然而，在竞争处理之间，低竞争条件下的蚊子比高竞争条件下的蚊子平均体型更大，感染率更低，全身滴度更低。这些结果表明，幼虫竞争在自然蚊子种群中很常见，通过改变蚊子与病毒的相互作用对成虫有重要的间接影响。这种间接影响可能改变病原体的传播参数。
Both density-mediated and trait-mediated indirect biotic interactions may be important in structuring communities. Indirect interactions in many study systems remain unexplored; in part, because they are often difficult to detect, and in many instances, have been identified empirically only when unexpected results arise. Indirect effects induced by competition may be particularly important among organisms with complex life cycles, wherein competitive effects experienced in one life stage influence species interactions in one or more subsequent stages. We determined whether species-specific effects of larval competition in the mosquitoes Aedes albopictus and Aedes aegypti have indirect effects at the adult stage, specifically testing for effects on arboviral infection with Sindbis virus (SINV). For A. albopictus, but not for A. aegypti, competition resulted in greater infection, body titer, and dissemination rates compared to low-competition conditions. Whole body titers of virus increased with adult size irrespective of competition. However, between competitive treatments, mosquitoes from low-competition conditions had greater mean size, with lower infection rates and lower whole body titers than the smaller mosquitoes from high-competition conditions. These results suggest that larval competition, common in natural mosquito populations, has important indirect effects on adults by altering mosquito-virus interactions. Such indirect effects may change transmission parameters of pathogens.