Intraspecific interaction of host plants leads to concentrated distribution of a specialist herbivore through metabolic alterations in the leaves
Intraspecific interaction of host plants leads to concentrated distribution of a specialist herbivore through metabolic alterations in the leaves
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DOI：
10.1111/1365-2435.13988
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发表时间：
2021-12-30
影响因子：
5.2
通讯作者：
Yamawo, Akira
中科院分区：
文献类型：
--
作者：
Ohsaki, Haruna;Miyagi, Atsuko;Yamawo, Akira
1. 最近的研究表明，由于植物之间的相互作用而引起的叶片性状的变化会影响食草动物的资源利用以及食草动物的分布。然而，这一点尚未得到实验证实。在这里，我们研究了 Rumex obtusifofius（寄主植物）叶子性状的表型可塑性对种内和种间相互作用对两种叶甲虫（Gastrocyyanea（专科食草动物）和 Gaierucella grisescens（通才食草动物）分布的影响）。2。我们调查了五个研究地点的 R. obtusifolius 植物的当地种群密度以及植物上叶甲虫的存在情况。对聚集和单生的 R. obtusifolius 植物的叶子化学物质（缩合单宁和总酚）进行了比较。为了阐明R. obtusifolius植物的相互作用环境对其叶片性状和叶甲虫资源利用的影响，我们比较了R. obtusifolius在栽培实验中经历种内相互作用、种间相互作用或无相互作用的处理中的叶化学物质和成年叶甲虫的偏好。最后，我们在中生态实验中评估了斑块大小和种内相互作用对叶甲分布的独立和综合影响。3．在田间，专业叶甲虫 G. atrocyanea 的存在与 R. obtusifofius 植物的当地种群密度（莲座重叠率）呈正相关；然而，对于普通叶甲虫 G. grisescens 来说，没有相关性。在栽培实验中，种内相互作用处理中的植物增加了其叶片中缩合单宁和总酚的浓度，并且与其他处理中的叶片相比，G. atrocyanea 消耗了更多的这些叶片。在现场也观察到类似的结果。在中生态实验中，暴露于地下种内相互作用的R. obtusifolius植物上分布的G. atrocyanea数量比未暴露于种内相互作用的植物上的分布要多。4．我们的结果提供了实验证据，表明寄主植物之间的种内相互作用引起的叶性状变化会影响专科食草动物的分布。这凸显了将植物与植物相互作用纳入我们对植物与动物相互作用的理解的必要性。
1. Recent studies suggest that changes in leaf traits due to interactions between plants affect resource utilisation by herbivores, as well as herbivore distribution. However, this has not yet been confirmed experimentally. Here, we investigated the effects of phenotypic plasticity in leaf traits of Rumex obtusifofius (host plant) in response to intraspecific and interspecific interactions on the distribution of two leaf beetles, Gastrophysa atrocyanea (specialist herbivore) and Gaierucella grisescens (generalist herbivore).2. We investigated the local population density of R. obtusifolius plants and the presence of leaf beetles on the plants at five study sites. Leaf chemicals (condensed tannins and total phenolics) were compared between aggregated and solitary R. obtusifolius plants. To clarify the effects of the interaction environment of R. obtusifolius plants on their leaf traits and on resource utilisation by the leaf beetles, we compared leaf chemicals and preferences of adult leaf beetles among treatments where R. obtusifolius experienced intraspecific interaction, interspecific interaction or no interaction in cultivation experiments. Finally, we evaluated the independent and combined effects of patch size and intraspecific interaction on leaf beetle distribution in mesocosm experiments.3. In the field, the presence of the specialist leaf beetle G. atrocyanea was positively correlated with the local population density (rosette overlap ratio) of R. obtusifofius plants; however, there was no correlation in the case of the generalist leaf beetle G. grisescens. In the cultivation experiments, plants in the intraspecific interaction treatment increased their leaf concentrations of condensed tannins and total phenolics, and G. atrocyanea consumed more of these leaves than leaves in other treatments. Similar results were observed in the field. In the mesocosm experiments, larger numbers of G. atrocyanea were distributed on R. obtusifolius plants exposed to below-ground intraspecific interaction than on plants not exposed to intraspecific interaction.4. Our results provide experimental evidence that leaf-trait changes in response to intraspecific interaction between host plants influence specialist herbivore distribution. This highlights the need to integrate plant-plant interactions into our understanding of plant-animal interactions.