Resource depletion in Aedes aegypti mosquitoes infected by the microsporidia Vavrala cullcis
Resource depletion in Aedes aegypti mosquitoes infected by the microsporidia Vavrala cullcis
复制标题
DOI：
10.1017/s0031182007002703
复制
发表时间：
2007-09-01
期刊：
影响因子：
2.4
通讯作者：
Michalakis, Y.
中科院分区：
文献类型：
--
作者：
Rivero, A.;Agnew, P.;Michalakis, Y.
寄生虫感染通常与宿主生活史特征的变化有关，例如宿主发育。许多生活史变化最终被认为是宿主资源耗尽或重新分配的结果，这些资源由宿主（以最小化感染的影响）或寄生虫（以最大化其生长速度）驱动。在本文中，我们研究了被 Vavraia culicis 感染的埃及伊蚊幼虫的能量预算，Vavraia culicis 是一种在幼虫之间水平传播的微孢子虫寄生虫，之前已被证明可以降低宿主化蛹的可能性。我们的结果表明，受感染的幼虫的脂质、糖和糖原明显少于未感染的幼虫。这些资源差异并不是由于幼虫能量摄入（摄食率）或支出（代谢率）的差异造成的。我们得出的结论是，受感染蚊子的能量资源较低是微孢子虫寄生虫对其宿主产生高代谢需求的结果。鉴于寄生虫将宿主维持在幼虫阶段的适应性优势，我们讨论资源耗尽是否也可能是寄生虫阻止幼虫化蛹并从而最大化其自身传播的机制。
Parasitic infection is often associated with changes in host life-history traits, such as host development. Many of these life-history changes are ultimately thought to be the result of a depletion or reallocation of the host's resources driven either by the host (to minimize the effects of infection) or by the parasite (to maximize its growth rate). In this paper we investigate the energetic budget of Aedes aegypti mosquito larvae infected by Vavraia culicis, a microsporidian parasite that transmits horizontally between larvae, and which has been previously shown to reduce the probability of pupation of its host. Our results show that infected larvae have significantly less lipids, sugars and glycogen than uninfected larvae. These differences in resources were not due to differences in larval energy intake (feeding rate) or expenditure (metabolic rate). We conclude that the lower energetic resources of infected mosquitoes are the result of the high metabolic demands that microsporidian parasites impose on their hosts. Given the fitness advantages for the parasite of maintaining the host in a larval stage, we discuss whether resource depletion may also be a parasite mechanism to prevent the pupation of the larvae and thus maximize its own transmission.