Johnson N D, Brain S A, Ehrlich P R
Department of Ecology and Evolution, SUNY Stony Brook, 11794, Stony Brook, NY.
Department of Biology, Stanford University, 94305, Stanford, CA.
Oecologia. 1985 Apr;66(1):106-110. doi: 10.1007/BF00378560.
The chaparral shrub Eriodictyon californicum secretes a phenolic leaf resin composed of flavonoid aglycones. We used leaves with artificially altered resin contents to test the effects of resin on the feeding, growth, and oviposition of the specialist herbivore Trirhabda diducta. In addition, we compared Trirhabda feeding and growth on young foliage with that on foliage from the preceding year. Our results show that the Eriodictyon leaf resin affects Trirhabda larvae and adults similarly, having no significant effect on growth rates or on nutrient utilization at up to 5X the resin levels normally encountered by larvae in the field. Both Trirhabda larvae and adults respond to high resin concentrations by increasing their consumption rates, with concomitant decreases in digestibility and the efficiency of conversion of ingested food to biomass. Low-resin foliage is preferred by larvae for feeding and by adults for oviposition. Larvae feeding on leaves of the current season have higher growth efficiencies, consumption, and growth compared to larvae feeding on leaves from the preceding year.
加州圣盖博灌丛的加州石南属灌木分泌一种由黄酮苷元组成的酚类叶树脂。我们使用树脂含量经过人工改变的叶子，来测试树脂对专食性食草动物三线三齿叶甲的取食、生长和产卵的影响。此外，我们比较了三线三齿叶甲在幼叶和前一年叶子上的取食和生长情况。我们的结果表明，加州石南属植物的叶树脂对三线三齿叶甲的幼虫和成虫的影响类似，在高达幼虫在野外通常遇到的树脂水平的5倍时，对生长速率或营养利用没有显著影响。三线三齿叶甲的幼虫和成虫都会通过提高消耗率来应对高树脂浓度，同时消化率和摄入食物转化为生物量的效率会降低。低树脂含量的叶子是幼虫取食和成虫产卵的首选。与取食前一年叶子的幼虫相比，取食当年叶子的幼虫具有更高的生长效率、消耗量和生长速度。
