Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar, India.
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India.
Sci Rep. 2019 Aug 2;9(1):11258. doi: 10.1038/s41598-019-47603-9.
In nature exists a properly defined food chain- an order of hunting and getting hunted. One such hunter-hunted pair is considered in this context and coordinated escape manoeuvres in response to predation is studied in case of a rarely examined confined system. Both the predator agent and prey agents are considered to be self-propelled particles moving in a viscous fluid. The state of motility when alive and passivity on death has been accounted for. A novel individual-based combination of Vicsek model and Boids flocking model is used for defining the self-propelling action and inter-agent interactions. The regimes observed at differing levels of co-ordination segregated by quantification of global order parameter are found to be in agreement with the extant literature. This study strives to understand the penalty on the collective motion due to the restraints employed by the rigid walls of the confinement and the predator's hunting tactics. The success of any escape manoeuvre is dependent on the rate of information transfer and the strength of the agitation at the source of the manoeuvre. The rate of information transfer is studied as a function of co-ordination and the size of the influence zone and the source strength is studied as a function of escape acceleration activated on the agitated prey. The role of these factors in affecting survival rate of prey is given due coverage.
在自然界中存在着一个定义明确的食物链——一个狩猎和被捕猎的顺序。在这种情况下，研究了一种很少被检查的受限系统中，针对捕食而进行的协调逃避策略。在这个模型中，捕食者和被捕食者都被视为在粘性流体中移动的自推进粒子。考虑到了生物的能动性（即活着时的运动状态）和死后的被动性。使用了一种新颖的基于个体的 Vicsek 模型和 Boids 群体模型的组合，用于定义自推进动作和个体间的相互作用。通过量化全局序参量来划分不同协调水平的观察到的状态，与现有文献一致。这项研究旨在理解由于受限环境的刚性壁所施加的约束和捕食者的狩猎策略，对集体运动造成的惩罚。任何逃避策略的成功都取决于信息传递的速度和动作源的搅动强度。信息传递的速度作为协调和影响区域大小的函数进行研究，而源强度作为被搅动的猎物上激活的逃避加速度的函数进行研究。这些因素在影响猎物存活率方面的作用得到了充分的关注。
