Field evidence for indirect interactions between foliar-feeding insect and root-feeding nematode communities on Nicotiana tabacum
Field evidence for indirect interactions between foliar-feeding insect and root-feeding nematode communities on Nicotiana tabacum
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DOI：
10.1111/j.1365-2311.2008.01062.x
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发表时间：
2009-04-01
影响因子：
2.2
通讯作者：
Denno, Robert F.
中科院分区：
文献类型：
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作者：
Kaplan, Ian;Sardanelli, Sandra;Denno, Robert F.
1.由于食草动物经常引起植物性状的系统变化，通过诱导植物反应的间接相互作用可能是构成食草动物群落的普遍特征。虽然这一现象对食草性昆虫的重要性已经得到强调，但目前尚不清楚诱导反应是否以及如何有助于其他主要植物寄生类群的组织。采用调查和田间试验相结合的方法，研究了植物在烟草上叶食性昆虫和根食性线虫动态中的作用。昆虫和线虫之间的植物相互作用在很大程度上可以通过昆虫取食协会来区分，昆虫-线虫的积极相互作用主要与咀嚼叶片的昆虫(毛虫)有关，而与以树液为食的昆虫(蚜虫)之间的相互作用则主要是负相互作用。例如，昆虫的落叶量与食根线虫的丰度呈正相关，而蚜虫和线虫的丰度则呈负相关。叶部昆虫和线虫根部食草性的试验田操作也倾向于支持这一结果。总体而言，这些结果表明，植物间接地将空间上不同的生态系统中不同的消费类群的动态联系在一起。这支持了一种日益增长的看法，即植物在向不同的消费者群体传播间接影响方面发挥着关键作用。
1. As herbivory often elicits systemic changes in plant traits, indirect interactions via induced plant responses may be a pervasive feature structuring herbivore communities. Although the importance of this phenomenon has been emphasised for herbivorous insects, it is unknown if and how induced responses contribute to the organisation of other major phytoparasitic taxa.2. Survey and experimental field studies were used to investigate the role of plants in linking the dynamics of foliar-feeding insects and root-feeding nematodes on tobacco, Nicotiana tabacum.3. Plant-mediated interactions between insects and nematodes could largely be differentiated by insect feeding guild, with positive insect-nematode interactions predominating with leaf-chewing insects (caterpillars) and negative interactions occurring with sap-feeding insects (aphids). For example, insect defoliation was positively correlated with the abundance of root-feeding nematodes, but aphids and nematodes were negatively correlated. Experimental field manipulations of foliar insect and nematode root herbivory also tended to support this outcome.4. Overall, these results suggest that plants indirectly link the dynamics of divergent consumer taxa in spatially distinct ecosystems. This lends support to the growing perception that plants play a critical role in propagating indirect effects among a diverse assemblage of consumers.