PRF: Energetics and Hydrodynamics of Suspension Feeding in Blackfish: Ontogenetic Shift in Feeding Mode

成年悬浮摄食鱼类（例如，鲭鱼和鲭鱼） 通过张开嘴游泳捕捉多个猎物。 尽管这些鱼在经济和生态上都很重要， 很少有研究测试了关于功能性的假设， 形态学、能量学和流体动力学的悬浮进料。 幼年时，这些物种以颗粒为食， 利用吸力捕获个体猎物。 深刻的转变， 颗粒进料到悬浮进料提供了一个理想的 有机会研究悬浮饲料从一个机械 perspective. 呼吸生理学技术和 生物力学将用于测试两个主要假设： 第一，通过所述第一通道的水路径的液压阻力 口腔和鳃盖腔，以及流体动力阻力 整个身体在游泳过程中，嘴巴张开， 黑鱼幼鱼的含量显著高于成年鱼;以及 第二，摄食的能量成本急剧下降 在喂食模式之间的转换。 虽然 悬浮液进料的能量成本可能较低， 过渡，身体上的限制可能会阻止青少年 悬浮饲养 关于影响妇女地位的因素的资料 不同进食模式之间的转换将对浮游生物产生影响 种群动态，幼鱼和幼鱼之间的资源分配， 成鱼，以及鱼类悬浮摄食的进化。 加州大学戴维斯分校将担任东道主 这个博士后研究奖学金项目的机构。 该奖项的期限为两年。

Adult suspension feeding fishes (e.g., anchovies and mackerels) capture multiple prey by swimming with mouths held open. Despite the economic and ecological importance of these fishes, few studies have tested hypotheses concerning the functional morphology, energetics, and hydrodynamics of suspension feeding. As juveniles, these species are particulate feeders that capture individual prey using suction. The profound shift from particulate feeding to suspension feeding offers an ideal opportunity to investigate suspension feeding from a mechanistic perspective. The techniques of respiratory physiology and biomechanics will be applied to test two main hypotheses: first,that the hydraulic resistance of the water path through the oral and opercular cavities, as well as the hydrodynamic drag of the entire body during swimming with the mouth held open, is significantly higher in juvenile blackfish than in adults; and secondly, that the energetic cost of feeding decreases abruptly over the transition between feeding modes. Although the energetic cost of suspension feeding may be low after the transition, physical constraints may prevent juveniles from suspension feeding. Information on the factors involved in the switch between feeding modes will have implications for plankton population dynamics, resource partitioning between juvenile and adult fishes, and the evolution of suspension feeding in fishes. The University of California at Davis will serve as the host institution for this postdoctoral research fellowship project. The duration of this award is two years.