HOST-PLANT QUALITY INFLUENCES DIAPAUSE AND VOLTINISM IN A POLYPHAGOUS INSECT HERBIVORE
HOST-PLANT QUALITY INFLUENCES DIAPAUSE AND VOLTINISM IN A POLYPHAGOUS INSECT HERBIVORE
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寄主植物质量影响杂食性草食昆虫的滞育和挥发性
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. McNeil
中科院分区：
文献类型：
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作者：
M. Hunter;J. McNeil
兼性滞育是一种策略，允许昆虫在条件有利的时候启动额外的世代，或者在条件不好的时候进入滞育。一年内增加世代的发生可能会对一个物种的生态和进化产生深远的影响。以前对诱导昆虫兼性滞育的线索的研究大多集中在光周期和温度上。相反，我们研究了寄主植物质量对多食性昆虫玫瑰色毛虫幼虫滞育诱导和随后的卷积行为的影响。田间试验表明，4种寄主植物的幼虫进入滞育的比例不同。取食赤枫或白蜡树的幼虫比取食红枫或黑蜡树的幼虫更有可能继续发育并产生第二代。纸桦在滞育诱导中居中。室内离体叶试验支持田间试验结果，证明在恒定的光周期和温度条件下，滞育的诱导依赖于寄主种类。对低品质和高品质人工饲料的进一步研究表明，幼虫饲料的营养质量对滞育诱导有直接影响：低品质饲料有利于滞育诱导。新生幼虫从寄主叶片上的扩散并不一定反映寄主质量和二化性的潜力。我们认为，植物品质对食草性昆虫自然种群滞育诱导的影响值得关注。
Facultative diapause is a strategy that allows insects to initiate an additional generation when conditions are favorable, or to enter diapause when they are not. The occurrence of additional generations within one year can have a profound effect on the ecology and evolution of a species. Most previous studies of the cues that induce facultative diapause in insects have concentrated on photoperiod and temperature. In contrast, we studied the effects of host-plant quality on the induction of larval diapause and subsequent voltinism in a polyphagous insect herbivore, Choristoneura rosaceana (Lepidoptera: Tortricidae). Field experiments demonstrated that the proportion of larvae entering diapause differed among four host-plant species. Larvae feeding on chokecherry were more likely to continue development and produce a second generation than larvae feeding on red maple or black ash. Paper birch was intermediate in diapause induction. Laboratory experiments with excised foliage supported the results of the field experiments and demonstrated that the induction of diapause depended on host species under constant conditions of photoperiod and temperature. A further study with low- and high-quality artificial diet demonstrated that the nutritional quality of larval diet has a direct effect on diapause induction: low-quality diet favored diapause induction. Dispersal of neonate larvae from host foliage did not necessarily reflect host quality and the potential for bivoltinism. We argue that the effect of plant quality on diapause induction in natural populations of insect herbivores merits more attention.