Symbiotic fungal endophytes control insect host-parasite interaction webs
Symbiotic fungal endophytes control insect host-parasite interaction webs
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DOI：
10.1038/35051070
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发表时间：
2001-01-04
期刊：
影响因子：
64.8
通讯作者：
Müller, CB
中科院分区：
文献类型：
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作者：
Omacini, M;Chaneton, EJ;Müller, CB
与陆生植物密切相关的共生微生物影响资源的数量和质量（1，2），从而影响食物链中更高层次消费群体的能量供应。关于食物网资源限制的经验证据表明，初级生产力是消费者数量和营养结构的主要决定因素（3-6）。猎物质量在社区监管中起着至关重要的作用（7，8）。已知被内生真菌感染的植物被化学保护以防止食草动物消耗（9-11）。然而，这种微生物-植物联合体对多营养相互作用的影响在很大程度上仍未被探索。在这里，我们提出了真菌内生菌对昆虫食物网的影响，反映了有限的能量转移到消费者作为低植物质量的结果，而不是低生产力。无内生菌的草上的食草动物寄生虫网显示出在交替的营养水平上增强的昆虫丰度，更高的寄生率，以及由一些营养环节增加的优势。这些结果反映了生产力提高对食物网动态的预测影响（12）。因此，“隐藏的”微生物共生体可以对资源消费者相互作用的模式和强度产生全社区的影响。
Symbiotic microorganisms that live intimately associated with terrestrial plants affect both the quantity and quality of resources(1,2), and thus the energy supply to consumer populations at higher levels in the food chain. Empirical evidence on resource limitation of food webs points to primary productivity as a major determinant of consumer abundance and trophic structure(3-6). Prey quality plays a critical role in community regulation(7,8). Plants infected by endophytic fungi are known to be chemically protected against herbivore consumption(9-11). However, the influence of this microbe-plant association on multi-trophic interactions remains largely unexplored. Here we present the effects of fungal endophytes on insect food webs that reflect limited energy transfer to consumers as a result of low plant quality, rather than low productivity. Herbivore-parasite webs on endophyte-free grasses show enhanced insect abundance at alternate trophic levels, higher rates of parasitism, and increased dominance by a few trophic links. These results mirror predicted effects of increased productivity on food-web dynamics(12). Thus 'hidden' microbial symbionts can have community-wide impacts on the pattern and strength of resource-consumer interactions.