Wang Yiming, Harrison Robert L, Shi Juan
Sino-France Joint Laboratory for Invasive Forest Pests in Eurasia, Beijing Forestry University, Beijing 100083, China.
Invasive Insect Biocontrol and Behavior Laboratory, USDA-ARS, Beltsville, MD 20705, USA.
Insects. 2021 Feb 17;12(2):175. doi: 10.3390/insects12020175.
The life-history traits of the gypsy moth, L. (Lepidoptera: Erebidae), have been observed to vary with larval population density, which can increase significantly during an outbreak of this pest. Laboratory studies on density-dependent variation in gypsy moth development have focused on single populations and were limited to comparing solitary larvae with groups of larvae reared at a single density. To evaluate how density-dependent impacts on development vary with different populations and subspecies of , we compared the effects of rearing larvae of a European gypsy moth ( L.) population from Connecticut, USA; and larvae of two populations of the Asian gypsy moth ( Vnukovskij) from Guizhou and Hebei provinces in China. Larvae were reared on an artificial diet at densities of one, three, five, seven, and nine larvae per 115 mL container, and the duration of larval development, percentage of surviving larvae, and the rates of pupation and emergence were measured at each density. A two-tailed response to density variation with values falling away on both sides from a peak or climbing from a base was observed for all three populations tested, with the most rapid larval development and the highest values of survival, pupation, and emergence observed at a density of five larvae/container. Although differences in larval development time, survival, pupation and emergence were observed among the different populations under the conditions of our study, our findings indicate that density-dependent effects on the development of different gypsy moth subspecies and populations follow the same trends.
人们观察到，舞毒蛾（鳞翅目：灯蛾科）的生活史特征会随幼虫种群密度而变化，在这种害虫爆发期间，种群密度会显著增加。关于舞毒蛾发育过程中密度依赖性变化的实验室研究主要集中在单一群体上，并且仅限于将单独饲养的幼虫与在单一密度下饲养的幼虫群体进行比较。为了评估密度依赖性对发育的影响如何因舞毒蛾的不同种群和亚种而有所不同，我们比较了来自美国康涅狄格州的欧洲舞毒蛾种群（L.）的幼虫，以及来自中国贵州和河北的两个亚洲舞毒蛾种群（Vnukovskij）的幼虫的发育情况。幼虫以人工饲料饲养，每115毫升容器中分别饲养1只、3只、5只、7只和9只幼虫，测量每个密度下幼虫发育时间、存活幼虫百分比、化蛹率和羽化率。在所有测试的三个种群中，均观察到对密度变化的双尾响应，即值从峰值向两侧下降或从底部上升，在每容器5只幼虫的密度下，幼虫发育最快，存活率、化蛹率和羽化率最高。尽管在我们的研究条件下，不同种群之间在幼虫发育时间、存活率、化蛹率和羽化率方面存在差异，但我们的研究结果表明，密度依赖性对不同舞毒蛾亚种和种群发育的影响遵循相同的趋势。
