Extinctions in the random replicator model.
Extinctions in the random replicator model.
复制标题
随机复制模型中的灭绝。
DOI：
10.1103/physreve.64.051911
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Fontanari
中科院分区：
文献类型：
--
作者：
V. M. de Oliveira;J. Fontanari
利用无序系统平衡统计力学的工具，分析研究了由两两随机相互作用和确定性浓度限制自相互作用组成的生态系统的统计性质。强调的是外部引起的物种灭绝的一个固定的分数在进化过程的开始的影响。生态系统应对最初灭绝事件的方式取决于物种之间竞争的程度以及事件的强度。例如，在竞争激烈的制度，生态系统的多样性，由幸存物种的分数，实际上是不敏感的初始灭绝的强度，只要它不是太大，而在竞争力较低的制度的多样性与事件的大小线性下降。在大灭绝事件的情况下，我们发现没有进一步的生物灭绝发生，而且，稀有物种变得非常不可能在平衡的生态系统中找到。此外，我们发现，爱德华-安德森序参数的倒数产生了一个很好的措施的多样性模型生态系统。
The statistical properties of an ecosystem composed of species interacting via pairwise, random interactions and deterministic, concentration limiting self-interactions are studied analytically with tools of equilibrium statistical mechanics of disordered systems. Emphasis is given to the effects of externally induced extinction of a fixed fraction of species at the outset of the evolutionary process. The manner the ecosystem copes with the initial extinction event depends on the degree of competition among the species as well as on the strength of that event. For instance, in the regime of high competition the ecosystem diversity, given by the fraction of surviving species, is practically insensitive to the strength of the initial extinction provided it is not too large, while in the less competitive regime the diversity decreases linearly with the size of the event. In the case of large extinction events we find that no further biotic extinctions take place and, furthermore, that rare species become very unlikely to be found in the ecosystem at equilibrium. In addition, we show that the reciprocal of the Edwards-Anderson order parameter yields a good measure of the diversity of the model ecosystem.