Edwards Penelope B, Wanjura W J, Brown W V
CSIRO Division of Entomology, GPO Box 1700, 2601, Canberra, A.C.T., Australia.
Oecologia. 1993 Oct;95(4):551-557. doi: 10.1007/BF00317440.
Between-tree variation in the terpenoid composition in the foliage of six species of Eucalyptus was investigated in relation to its effects on herbivory by Christmas beetles (Anoplognathus spp.). All six eucalypt species showed considerable intraspecific variation in terpenoid composition; the cineole content ranged from 13% to 78% of the total oil in different E. melliodora trees, from 0% to 67% in E. conica, 3% to 79% in E. sideroxylon, 1% to 76% in E. camaldulensis, 3% to 60% in E. rubida and 20% to 79% in E. blakelyi. Levels of defoliation by Christmas beetles of nine E. melliodora and eight E. conica trees were quantified from frass traps placed under each tree, and were used to confirm the reliability of visual ratings of defoliation. Defoliation was assessed visually for all six species and was found to be unrelated to the total amount of terpenoids in the foliage of each tree, but strongly associated with the percentage of cineole in the terpenoid mixture. Levels of most terpenoid components were significantly inter-correlated, so it was not possible to determine which components directly affected defoliation. The dominant Christmas beetle at all sites was A. montanus.
研究了六种桉树叶中萜类化合物组成的树间差异及其对圣诞甲虫（Anoplognathus spp.）食草行为的影响。所有六种桉树在萜类化合物组成上均表现出显著的种内差异；在不同的蜜味桉（E. melliodora）树中，1,8-桉叶素含量占总油的比例在13%至78%之间，圆锥桉（E. conica）中为0%至67%，赤桉（E. sideroxylon）中为3%至79%，卡马拉桉（E. camaldulensis）中为1%至76%，红桉（E. rubida）中为3%至60%，布莱克利桉（E. blakelyi）中为20%至79%。通过放置在每棵树下的粪便诱捕器对9棵蜜味桉和8棵圆锥桉的圣诞甲虫落叶水平进行了量化，并用于确认落叶视觉评级的可靠性。对所有六个物种的落叶情况进行了视觉评估，发现其与每棵树叶中萜类化合物的总量无关，但与萜类混合物中1,8-桉叶素的百分比密切相关。大多数萜类成分的含量之间存在显著的相互关联，因此无法确定哪些成分直接影响落叶。所有地点的主要圣诞甲虫是A. montanus。
