边界附近微观悬浮生物的新视角。
A new angle on microscopic suspension feeders near boundaries.
机构信息
Departments of Integrative Biology and Civil and Environmental Engineering, University of California at Berkeley, Berkeley, California.
出版信息
Biophys J. 2013 Oct 15;105(8):1796-804. doi: 10.1016/j.bpj.2013.08.029.
Microscopic sessile suspension feeders are a critical component in aquatic ecosystems, acting as an intermediate trophic stage between bacteria and higher eukaryotic taxa. Because they live attached to boundaries, it has long been thought that recirculation of the feeding currents produced by sessile suspension feeders inhibits their ability to access fresh fluid. However, previous models for the feeding flows of these organisms assume that they feed by pushing fluid perpendicular to surfaces they live upon, whereas we observe that sessile suspension feeders often feed at an angle to these boundaries. Using experiments and calculations, we show that living suspension feeders (Vorticella) likely actively regulate the angle that they feed relative to a substratum. We then use theory and simulations to show that angled feeding increases nutrient and particle uptake by reducing the reprocessing of depleted water. This work resolves an open question of how a key class of suspension-feeding organisms escapes physical limitations associated with their sessile lifestyle.
微观固着悬浮取食者是水生生态系统的关键组成部分，它们作为细菌和高等真核生物之间的中间营养级。由于它们附着在边界上，长期以来人们一直认为，固着悬浮取食者产生的食物流的再循环抑制了它们获取新鲜流体的能力。然而，这些生物体的取食流的先前模型假设它们通过将流体推向它们生活的表面来取食，而我们观察到固着悬浮取食者通常以相对于这些边界的角度取食。通过实验和计算，我们表明活的悬浮取食者（钟形虫）可能会主动调节它们相对于基质的取食角度。然后，我们使用理论和模拟表明，角度取食通过减少贫化水的再处理，增加了营养物和颗粒的摄取。这项工作解决了一个悬而未决的问题，即一类关键的悬浮取食生物如何摆脱与其固着生活方式相关的物理限制。
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