McEdward L R., Qian P -Y.
Department of Zoology, University of Florida, Gainesville, FL, USA
J Exp Mar Biol Ecol. 2001 Jul 1;261(2):185-197. doi: 10.1016/s0022-0981(01)00272-6.
The larvae of the polychaete Hydroides elegans were exposed to different feeding schedules to evaluate the effects of starvation on metamorphosis and initial juvenile volume. The timing of starvation (early or late in development) and the total number of days of feeding (3, 5 or 8 days) at 24 degrees C had significant effects on the percentage of larvae that successfully completed metamorphosis and on the volume of the post-metamorphic juveniles. However, the duration of starvation (2, 4, 6 or 8 days) did not influence metamorphosis or juvenile volume. For larvae that had fed for 3 or 5 days, those that were starved at the beginning of development had a higher percentage of successful metamorphosis and produced larger juveniles compared with those starved after an initial 3-day feeding period. Larvae that had been allowed to feed for a total of 8 days were not affected by the timing of starvation. The percentage metamorphosis was lower in larvae that had fed for 3 days (16%), but was not significantly different between those that fed for 5 days (47%) compared to 8 days (47%). However, juvenile volume increased with the number of days of feeding from 0.95 nl after 3 days to 1.35 nl after 5 days, to 1.91 nl after 8 days of feeding. Discontinuous feeding reduced the proportion of larvae undergoing metamorphosis and juvenile volume compared to larvae continuously fed for only 5 days, but had no effect on larvae that fed for 8 days. The larvae of this extremely successful fouling species are remarkably tolerant of starvation and seem to require approximately 5 days of continuous feeding to achieve high levels of metamorphic success and large initial juvenile volume.
将多毛纲动物优美盘管虫的幼虫暴露于不同的投喂时间表下，以评估饥饿对变态和幼体初始体积的影响。在24摄氏度下，饥饿的时间（发育早期或晚期）以及投喂的总天数（3天、5天或8天）对成功完成变态的幼虫百分比和变态后幼体的体积有显著影响。然而，饥饿的持续时间（2天、4天、6天或8天）并不影响变态或幼体体积。对于已经投喂3天或5天的幼虫，在发育开始时就饥饿的幼虫相比在最初3天投喂期后饥饿的幼虫，成功变态的百分比更高，并且产生的幼体更大。总共被允许投喂8天的幼虫不受饥饿时间的影响。投喂3天的幼虫变态百分比更低（16%），但投喂5天（47%）和8天（47%）的幼虫之间没有显著差异。然而，幼体体积随着投喂天数的增加而增加，从投喂3天后的0.95纳升增加到投喂5天后的1.35纳升，再到投喂8天后的1.91纳升。与仅连续投喂5天的幼虫相比，间断投喂降低了经历变态的幼虫比例和幼体体积，但对投喂8天的幼虫没有影响。这种极其成功的污损物种的幼虫对饥饿具有显著的耐受性，并且似乎需要大约5天的连续投喂才能实现高水平的变态成功率和较大的初始幼体体积。
