Régnier Thomas, Bolliet Valérie, Gaudin Philippe, Labonne Jacques
INRA-UMR ECOBIOP, Pôle d'Hydrobiologie INRA, Saint Pée sur Nivelle, France.
J Exp Zool A Ecol Genet Physiol. 2012 Jul;317(6):347-58. doi: 10.1002/jez.1728.
Energetic status can be defined as the interaction between energy stores and metabolic rate. In salmonids, it is variable and influences the timing of emergence, and therefore may have strong effects on both juvenile and maternal fitness. The aim of this study is to (i) describe the ontogeny of energy use for different brown trout clutches to understand how such a variability of energetic status is developed at the end of incubation and (ii) to estimate maternal influences over offspring physiological processes. Using individual measures of total mass and metabolism throughout ontogeny combined with a hierarchical Bayesian modeling approach, we successfully described clutch-specific (i) metabolic trajectories, (ii) use of yolk resources and the building of new tissues throughout ontogeny. Our results show that females laying large eggs have offspring with lower metabolic costs and higher yolk conversion efficiencies. Females also influence within clutch variance of metabolic and yolk consumption rates leading to potential developmental variations. These results are discussed with regard to their consequences on early life history through the critical period of emergence.
能量状态可定义为能量储备与代谢率之间的相互作用。在鲑科鱼类中，能量状态是可变的，会影响出膜时间，因此可能对幼鱼和母体的适合度都产生重大影响。本研究的目的是：（i）描述不同褐鳟鱼卵的能量利用个体发育过程，以了解在孵化末期这种能量状态的变异性是如何形成的；（ii）估计母体对后代生理过程的影响。通过在个体发育全过程中对总质量和代谢进行单独测量，并结合分层贝叶斯建模方法，我们成功地描述了特定鱼卵的（i）代谢轨迹，（ii）卵黄资源利用情况以及在整个个体发育过程中新组织的构建情况。我们的结果表明，产下大卵的雌鱼所产后代具有较低的代谢成本和较高的卵黄转化效率。雌鱼还会影响鱼卵内代谢率和卵黄消耗率的方差，从而导致潜在的发育差异。我们将结合这些结果对出膜关键期的早期生活史所产生的影响进行讨论。
