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Random-walk dynamics of exploited fish populations

机译:被开发鱼类种群的随机游走动态

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Fished populations have been heavily fished over a wide range of stock sizes, and the data for such stocks are potentially of great interest. Population variability in stock histories has focused attention on the predictability of conditions of sustainability when harvesting fish. Here, I examine empirically the time-series data on 27 commercial fish stocks in the North Atlantic. The variability in population growth rate (i.e. the annual changes in the logarithms of population abundance) is described by a Gaussian distribution. The signs (up or down) of successive changes in the population trajectory are independent, as if determined by the toss of a coin. The process of population variability therefore corresponds to a geometric random walk.
机译:在各种各样的种群规模中,被捕捞的种群被大量捕捞,这些种群的数据可能引起人们的极大兴趣。种群历史上的种群变异性已将注意力集中在捕捞鱼类时可持续性条件的可预测性上。在这里,我根据经验检查了北大西洋27种商业鱼类种群的时间序列数据。人口增长率的变化性(即人口数量对数的年度变化)由高斯分布来描述。人口轨迹连续变化的迹象(向上或向下)是独立的,好像是由掷硬币决定的。因此,种群变异性的过程对应于几何随机游动。

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