Yoshinaga T, Hagiwara A, Tsukamoto K
Behavior and Ecology, Department of Marine Bioscience, Ocean Research Institute, The University of Tokyo, 1-15-1 Minamidai, Nakano, 164-8639, Tokyo, Japan
J Exp Mar Biol Ecol. 2000 Oct 25;253(2):253-260. doi: 10.1016/s0022-0981(00)00268-9.
To estimate the changes in the life history of the rotifer Brachionus plicatilis O.F. Müller under starvation, we carried out an individual culture and determined the effects of periodical food deprivation on its asexual reproductive characteristics such as lifespan, reproductive period, age at first egg and offspring production, and lifetime fecundity (total number of offspring produced in her lifetime). Rotifers were fed for 1-3 h daily, and were then starved until the next day. Control animals were fed throughout their lifespan. Starved rotifers matured and produced their first offspring at an older age than the control animals. The periodical starvation resulted in a decrease in the lifetime fecundity to less than half that of the non-starved control. The reproductive period and lifespan were 2-3 times longer in the starved animals than in the control animals. The negative relationship between lifespan and lifetime fecundity is interpreted as a trade-off in an alternative life-history strategy of rotifers under starved conditions. The great decrease in fecundity and extension of lifespan enables rotifers to compensate to keep the population in equilibrium.
为了评估饥饿条件下褶皱臂尾轮虫（Brachionus plicatilis O.F. Müller）生活史的变化，我们进行了个体培养，并确定了定期食物剥夺对其无性生殖特征的影响，如寿命、生殖期、首次产卵年龄和后代产量以及终生繁殖力（一生中产生的后代总数）。轮虫每天喂食1 - 3小时，然后饥饿至第二天。对照动物在其整个生命周期中持续喂食。饥饿的轮虫比对照动物成熟得更晚，首次产卵年龄也更大。定期饥饿导致终生繁殖力下降至不到非饥饿对照的一半。饥饿动物的生殖期和寿命比对照动物长两到三倍。寿命和终生繁殖力之间的负相关关系被解释为饥饿条件下轮虫另一种生活史策略中的权衡。繁殖力的大幅下降和寿命的延长使轮虫能够进行补偿以维持种群平衡。
