PLANT CHEMISTRY AND INSECT SPECIES RICHNESS OF BRITISH UMBELLIFERS
PLANT CHEMISTRY AND INSECT SPECIES RICHNESS OF BRITISH UMBELLIFERS
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DOI：
10.2307/5413
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发表时间：
1991-10-01
影响因子：
4.8
通讯作者：
LAWTON, JH
中科院分区：
文献类型：
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作者：
JONES, CG;LAWTON, JH
(1)每寄主植物，寄主植物的物理特性（地理范围，大小和叶形），生物合成的不同类别的次生代谢产物和生化调查的强度的存在下，昆虫物种的数量的数据进行了汇编为英国伞形科（伞形科）的植食性昆虫数据库，以前发表的研究，植物化学文献，分别。(2)每个植物物种的化学多样性和独特性的措施，来自植物化学数据，和四个假设昆虫物种丰富度，这些化学变量进行了明确的开发和测试，使用单和多元回归技术。(3)多样的防御和生物化学屏障假说预测昆虫物种丰富度和化学多样性和独特性之间的负相关，分别，因为植物多样性或不寻常的防御应表现出减少昆虫殖民进化的时间。或者，共同的化学和敌人逃跑的假设预测昆虫丰富度和这两个化学变量之间的正相关性，因为植物与不同的化学有更高的概率共享化学物质共同的其他植物，促进主机转移，因为昆虫植食性生物化学不寻常的植物可能会逃脱捕食者和寄生虫，使用主机气味来定位猎物，再次促进主机转移。(4)在以前的研究中，植物地理范围的大小，植物的大小和叶的形状都影响昆虫物种丰富度。总之，这些变量占昆虫物种丰富度方差的46%，留下高达54%的无法解释的方差，可能是由宿主植物化学。(5)昆虫物种丰富度与化学独特性没有显着相关性，因此没有支持的生化屏障或敌人逃跑的假设。(6)昆虫物种丰富度与化学多样性呈正相关，支持共同化学防御假说，但不支持多样性防御假说。然而，支持共同的化学假说是脆弱的，因为生物化学研究的强度的混杂效应。当去除生物化学调查的强度后，化学多样性对昆虫物种丰富度的影响仍然是正的，但仅占变异的5%。(7)我们的结论是，没有证据表明，从这些数据，生物化学多样性或不寻常的英国伞形科植物支持较少的物种丰富的昆虫食草动物的组合。虽然数据表明化学成分多样化的植物有更多的昆虫物种，但我们认为这一证据充其量是微弱的。(8)我们讨论了进一步测试这些假设和所需的植物化学数据的类型的必要性。
(1) Data on the number of insect species per host-plant, host-plant physical characteristics (geographic range, size and leaf form), the presence of biosynthetically distinct classes of secondary metabolites and intensity of biochemical investigation were compiled for the British umbellifers (Apiaceae) from the Phytophagous Insect Data Bank, previously published studies, and phytochemical literature, respectively. (2) Measures of the chemical diversity and uniqueness of each plant species were derived from the phytochemical data, and four hypotheses relating insect species richness to these chemical variables were explicitly developed and tested using single and multiple regression techniques. (3) The diverse defence and biochemical barrier hypotheses predict negative correlations between insect species richness and chemical diversity and uniqueness, respectively, because plants with diverse or unusual defences should show reduced insect colonization over evolutionary time. Alternatively, the common chemistry and enemy escape hypotheses predict positive correlations between insect richness and these two chemical variables, because plants with diverse chemistry have a higher probability of sharing chemicals common to other plants, facilitating host shifts, and because insect herbivores on biochemically unusual plants may escape from predators and parasites that use host odours to locate prey, again facilitating host shifts. (4) As in previous studies, size of plant geographic range, plant size and leaf form all influence insect species richness. Together, these variables account for 46% of the variance in insect species richness, leaving up to 54% of unexplained variance that could potentially be accounted for by host plant chemistry. (5) Insect species richness is not significantly correlated with chemical uniqueness; thus there is no support for the biochemical barrier or enemy escape hypotheses. (6) Insect species richness is positively correlated with chemical diversity, supporting the common chemistry but not the diverse defense hypothesis. However, support for the common chemistry hypothesis is tenuous, because of the confounding effects of intensity of biochemical investigation. When intensity of biochemical investigation is factored out, the effects of chemical diversity on insect species richness are still positive and significant but account for only 5% of the variation. (7) We conclude that there is no evidence from these data that biochemically diverse or unusual British umbellifers support less-species-rich assemblages of insect herbivores. While the data suggest that chemically diverse plants have more insect species, we consider this evidence to be weak, at best. (8) We discuss the need for further tests of these hypotheses and the types of phytochemical data required.