Host life-history strategy explains pathogen-induced sterility
Host life-history strategy explains pathogen-induced sterility
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DOI：
10.1086/506922
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发表时间：
2006-09-01
影响因子：
2.9
通讯作者：
Bonds, Matthew H.
中科院分区：
文献类型：
--
作者：
Bonds, Matthew H.
毒力通常等同于病原体引起的死亡率，即使丧失繁殖力也很常见。但是，虽然前者可以被理解为一个简单的结果，失去了宿主资源的病原体传播的目的，病原体诱导的不育往往是不相关的变化，在主机死亡率。因此，出现了一个单独的文献来解释生殖力的影响，寄生，尚未纳入一般理论的毒力的演变。在这里，我提出了一个模型的病原体诱导的不育，这是基于假设，主机和病原体争夺相同的主机资源的繁殖和维护。宿主繁殖力的丧失可以解释为宿主在感染前补偿其未来的资源损失。这种感染前的“繁殖力补偿”可能经常导致感染前的维护投资低至感染后的水平，尽管感染后总的主机资源的损失。因此，不育性被简单地解释为一个系统中的宿主生活史策略，在该系统中，病原体必然会窃取宿主资源用于自身传播。在某些情况下，病原体甚至能够操纵宿主，将资源从生殖转移到通过阉割进行维护，从而导致不育症。
Virulence is often equated with pathogen-induced mortality, even though loss of fecundity is also common. But while the former may be understood as a simple consequence of lost host resources for the purposes of pathogen transmission, pathogen-induced sterility is often not associated with changes in host mortality. As a result, a separate literature has emerged to explain fecundity effects of parasitism that has not been integrated into general theories of the evolution of virulence. Here, I present a model of pathogen-induced sterility that is based on the assumption that hosts and pathogens vie for the same host resources for both reproduction and maintenance. Loss of host fecundity can then be explained by the host compensating for its future loss of resources, before infection. Such preinfection "fecundity compensation" may often cause preinfection investment in maintenance to be as low as postinfection levels, despite a loss of total host resources after infection. Thus, sterility is simply explained as a host life-history strategy in a system where the pathogen necessarily steals host resources for its own transmission. In certain circumstances, the pathogen may even be able to manipulate the host to redirect resources away from reproduction and toward maintenance through castration, causing gigantism.