Department of Theoretical Ecology, Lund University, Ecology Building, S-223 62 Lund, Sweden.
Integr Comp Biol. 2005 Nov;45(5):764-70. doi: 10.1093/icb/45.5.764.
The life histories of holo-anhydrobiotic animals differ from those of all other organisms by a regular or irregular entrance into an ametabolic state induced by desiccation. Such ametabolic periods will arrest growth and reproduction completely and thus affect primary life history parameters dramatically. The selective forces and the genetic and physiological trade-offs acting on anhydrobiotic animals are to a large extent unknown. Assuming low growth rates and low juvenile to adult survival, general theoretical models on life history responses to stress predict that anhydrobiotic animals will be selected for a high degree of iteroparity, with low fecundity, large egg size, and low total reproductive investment. A high degree of variability in growth and reproduction should create a selective force in the same direction. Although basic empirical data on life history parameters are very scarce, available observations seem to be consistent with this prediction.
真休眠兼缺水性动物的生活史与其他所有生物不同，它们通过定期或不定期地进入由干燥引起的无代谢状态。这种无代谢期将完全停止生长和繁殖，从而对主要的生活史参数产生巨大影响。作用于兼性休眠动物的选择压力和遗传及生理权衡在很大程度上是未知的。假设生长速度低，幼体到成体的存活率低，关于对压力的生活史反应的一般理论模型预测，兼性休眠动物将被选择具有高度的多次生殖，低繁殖力，大卵大小和低总生殖投资。生长和繁殖的高度可变性应该会产生相同方向的选择力。尽管关于生活史参数的基本经验数据非常稀缺，但现有的观察结果似乎与这一预测一致。
