Movement behavioral plasticity of benthic diatoms driven by optimal foraging

作者：Wensi Hu, Mingji Huang, Hepeng Zhang, Feng Zhang, Wim Vyverman, Quan‐Xing Liu · 发表于：bioRxiv (Cold Spring Harbor Laboratory) · 年份：2019 · DOI：10.1101/682153 · 被引用次数：5 · 研究领域：Diffusion and Search Dynamics、Micro and Nano Robotics、Lipid Membrane Structure and Behavior

ABSTRACT Adaptive locomotion of living organisms contributes to their competitive abilities and helps maintain their fitness in diverse environments. To date, however, our understanding of searching behavior and its ultimate cause remains poorly understood in ecology and biology. Here, we investigate motion patterns of biofilm-inhabiting marine raphid diatom Navicula arenaria var. rostellata in two-dimensional space. We report that individual Navicula cells display a “circular run-and-reversal” movement behavior at different concentrations of dissolved silicic acid (dSi). We show that gliding motions of cells can be predicted accurately with a universal Langevin model. Our experimental results are consistent with an optimal foraging strategy and a maximized diffusivity of the theoretical outcomes in which both circular-run and reversal behaviors are important ingredients. Our theoretical results suggest that the evolving movement behaviors of diatoms may be driven by optimization of searching behavioral strategy, and predicted behavioral parameters coincide with the experimental observations. These optimized movement behaviors are an evolutionarily stable strategy to cope with environmental complexity. ONE SENTENCE SUMMARY Novel experiments and modelling reveal that raphid diatoms can actively exploit resources in complex environments by adjusting their movement behavior.