Abstract

The western tarnished plant bug, Lygus hesperus Knight, overwinters as a diapausing adult in response to short day lengths. Once environmental conditions are favorable, the bugs revert to an active reproductive state. To determine the impact on life-history traits of diverting resources toward diapause rather than oogenesis during early adulthood, diapausing and nondiapausing L. hesperus females were reared from the same cohorts. Body mass, ovarian maturation, ovipositional activity, and survivorship were monitored starting either at the time of release from diapause-inducing conditions or at adult eclosion for diapausers and nondiapausers, respectively. Females that had gone through 2 wk of diapause were larger and able to mobilize the resources necessary for oogenesis faster than nondiapausers, initiating oogenesis and ovipositing sooner and at a faster initial rate. However, lifetime egg production and average daily rates were similar for both groups. Postdiapausers lived longer than nondiapausers by an average of 19 d, which is five more than the 2-wk period when they were reproductively senescent. Overall, the results indicate that short-term diapause does not have a negative impact on life history. Furthermore, the extra endogenous resources stored during diapause may be able to enhance the alacrity with which the female can take advantage of improved environmental conditions and may prolong life by shielding the females against environmental stressors such as temperature extremes, oxidative agents, or food deficits.

中文翻译：

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Lygus hesperus（异翅目：Miridae）的滞育终止和滞育后

摘要

西部失去光泽的植物臭虫Lygus hesperus Knight 以滞育成虫的形式过冬，以应对短日照。一旦环境条件有利，虫子就会恢复到活跃的繁殖状态。确定在成年早期将资源转移到滞育而不是卵子发生、滞育和非滞育L. hesperus 对生活史特征的影响雌性是从相同的队列中饲养的。体重、卵巢成熟、产卵活动和存活率分别从滞育诱导条件释放时或滞育者和非滞育者羽化时开始监测。经历了 2 周滞育的雌性体型更大，能够比非滞育者更快地调动卵子发生所需的资源，更快地以更快的初始速率启动卵子发生和排卵。然而，两组的终生产蛋量和平均每日产蛋率相似。后滞留者的平均寿命比非滞留者长 19 天，比他们生殖衰老时的 2 周多 5 天。总体而言，结果表明短期滞育对生活史没有负面影响。此外，