The aim of this study was to evaluate energetic source used by juveniles of a terrestrial oviparous invertebrate during the earliest periods of their life. Growth, behavioural activities and energy contents of Pardosa saltans spiderlings’ residual vitellus were monitored during 8 days after their emergence from their egg-sac until they disperse autonomously. The life-cycle of juvenile after emergence can be divided into three periods: a gregarious while juveniles are aggregated on their mother, dismounting off their mother’s back and dispersion. We present the first biochemical study of residual vitellus and energy expenditure during these three periods. At emergence, the mean weight of juveniles was 0.59 mg and energy stock from residual vitellus averaged 51 cal/g wet mass. During gregarious period, the weight of the juveniles aggregated on their mother did not vary significantly and juveniles utilized only 1 cal/day from their residual vitellus. During the period from dismounting until their first exogenous feed, juveniles lost weight and used 30% of their residual vitellus stock. Proteins from the residual vitellus contributed principally to their energy expenditure during this period: 1.5 µg protein/day. Juveniles’ first exogenous feeding was observed 7–8 days after emergence, when 70% of residual vitellus energy had been utilized. Juveniles dispersed after eating, reconstituting an energy stock comparable to that observed at emergence from egg-sac (50 cal/g wet mass). This new energy stock contains mainly lipids unlike the energy stock from the residual vitellus.

中文翻译：

---

Pardosa saltans 从卵囊出现后直到第一次捕食的残余卵黄和能量状态

本研究的目的是评估陆生卵生无脊椎动物幼体在其生命早期阶段使用的能量来源。在它们从卵囊中出现后直到它们自主分散的 8 天内，监测了 Pardosa saltans 幼蛛残余卵黄的生长、行为活动和能量含量。幼体出世后的生命周期可分为三个时期：群居时期，幼体聚集在母亲身上，从母亲背上下来和分散。我们对这三个时期的残留卵黄和能量消耗进行了首次生化研究。出苗时，幼鱼的平均体重为 0.59 毫克，残余卵黄的能量储备平均为 51 卡/克湿重。在群居期间，聚集在母亲身上的幼鱼的重量没有显着变化，而且幼鱼每天仅从其残留的卵黄中消耗 1 卡热量。在从下马到第一次外源饲料期间，幼鱼体重减轻并消耗了 30% 的剩余卵黄。在此期间，来自残余卵黄的蛋白质主要贡献了它们的能量消耗：1.5 µg 蛋白质/天。幼鱼的第一次外源摄食是在出现后 7-8 天观察到的，此时 70% 的剩余卵黄能量已被利用。幼鱼在进食后分散，重新构成的能量储备与从卵囊中观察到的能量储备相当（50 卡/克湿重）。这种新的能量储备主要包含脂质，与来自残留卵黄的能量储备不同。