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arXiv 1702.02889math.DS
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具有阶段间相互作用的Ricker种群模型的灭绝和Allee效应

Extinction and the Allee Effect in an Age-structured Ricker Population Model with Inter-stage Interaction

N. Lazaryan, H. Sedaghat

摘要:

我们研究离散时间的某些年龄结构的人口,如成年人和青少年,与Ricker适应度函数的演变。我们确定的条件收敛的轨道的起源(灭绝)在存在的Allee效应和随时间变化的生命率。我们表明,当阶段相互作用,他们可能会生存在没有内部不动点,一个令人惊讶的情况下,是不可能没有阶段间的相互作用。我们还研究了由阶段之间的相互作用引起的内部Allee平衡的变化,发现灭绝或Allee阈值不会延伸到平衡变化所设置的新边界,即没有内部平衡在灭绝阈值上。

英文摘要:

We study the evolution in discrete time of certain age-structured populations, such as adults and juveniles, with a Ricker fitness function. We determine conditions for the convergence of orbits to the origin (extinction) in the presence of the Allee effect and time-dependent vital rates. We show that when stages interact, they may survive in the absence of interior fixed points, a surprising situation that is impossible without inter-stage interactions. We also examine the shift in the interior Allee equilibrium caused by the occurrence of interactions between stages and find that the extinction or Allee threshold does not extend to the new boundaries set by the shift in equilibrium, i.e. no interior equilibria are on the extinction threshold.

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