The Impact of Leaf Shape on the Feeding Preference of Insect Herbivores: Experimental and Field Studies with Capsella and Phyllotreta
The Impact of Leaf Shape on the Feeding Preference of Insect Herbivores: Experimental and Field Studies with Capsella and Phyllotreta
复制标题
叶形状对食草昆虫摄食偏好的影响：荠菜和叶叶的实验和现场研究
DOI：
10.1098/rstb.1996.0149
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Lawton
中科院分区：
文献类型：
--
作者：
A. P. Rivero;V. Brown;J. Lawton
树叶的大小和形状有很大的差别。虽然这些属性似乎主要是在响应植物栖息地的非生物条件下进化而来的，但作为额外选择剂的食草昆虫的重要性仍然知之甚少。响应于昆虫的攻击而进化叶的大小和形状的必要要求是昆虫必须响应于叶形态和/或受叶形态影响。我们测试了成年跳甲（Phyllotreta spp.）以荠菜高度变异的莲座叶为食。与理论预期相反（Brown & Lawton 1991），在田间采集的和实验植物中，具有深裂边缘的叶子受到更强烈的损害。在两个辅助实验与荠菜，我们发现，Spodoptera毛虫没有表现出偏好的叶片形状，但成年藤象鼻虫（Oaprohynchus sulcatus）做，更喜欢（如预测），分裂的叶不分裂。我们的结论是，布朗和劳顿（1991年）的假设是在最好的弱支持实验室数据的藤蔓象鼻虫，反驳了实验室数据的夜蛾，并始终驳斥了实验室和现场数据的跳甲。虽然实验试图减少混淆变量到最低限度，解释复杂的叶子形状和其他发育参数的植物之间的相关性，并突出了解开其他混淆因素的叶子形状的影响的困难。
Leaves display an enormous array of sizes and shapes. Although these attributes appear to have evolved primarily in response to abiotic conditions in the plant's habitat, the importance of insect herbivores as additional selective agents is still poorly understood. A necessary requirement for leaf size and shape to evolve in response to attack by insects is that insects must respond to and/or be affected by, leaf morphology. We tested leaf-shape preferences in adult flea beetles (Phyllotreta spp.) feeding on the highly variable rosette leaves of Capsella bursa-pastoris. Contrary to theoretical expectation (Brown & Lawton 1991), leaves with deeply lobed margins were more intensely damaged, both in field-collected and experimental plants. In two ancillary experiments with Capsella, we found that Spodoptera caterpillars showed no preferences for leaf shape, but that adult vine weevils (Otiorhynchus sulcatus) did, preferring (as predicted), undivided over divided leaves. We conclude that Brown & Lawton's (1991) hypothesis is at best weakly supported by laboratory data for vine weevils, refuted by laboratory data for Spodoptera, and consistently refuted by both laboratory and field data for flea beetles. Although the experiment tried to reduce confounding variables to a minimum, interpretation was complicated by correlations between leaf shape and other developmental parameters of the plants, and highlights the difficulty of disentangling leaf-shape effects from other confounding factors.