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arXiv 2202.13294q-bio.PEmath.DSnlin.CD
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三物种食物链中捕食者灭绝瞬态时间的多峰分布

Multimodal distribution of transient time of predator extinction in a three-species food chain

Debarghya Pattanayak, Arindam Mishra, Syamal K. Dana, Nandadulal Bairagi

AI总结:

针对双稳态三营养级食物链模型,本文研究捕食者灭绝瞬态时间随初始状态的多峰、非均匀与各向异性分布,并提出两个指数加以刻画。

摘要:

瞬态动力学研究能够捕捉系统动力学中任何剧烈变化的时间历程。本文在一个双稳态三营养级食物链的经典生态模型中研究瞬态动力学。在经过一段取决于物种种群初始密度的瞬态时间后,食物链中的所有物种要么共存,要么发生伴随捕食者丧失的局部灭绝。捕食者灭绝瞬态时间相对于初始状态的分布,在无捕食者状态的盆域中表现出有趣的非均匀性和各向异性模式。具体而言,当初始点靠近盆域边界时,该分布呈现多峰特征;而在远离边界的位置则为单峰。该分布还具有各向异性,即峰的数量取决于从盆域位置出发的方向。我们定义了两个新的度量,即均匀性指数和局部各向同性指数,以刻画该分布的显著特征。资源富集会显著降低分布的非均匀性,但各向异性的类似变化相对较小。我们尝试从动力系统的角度解释这种多峰分布的起源,并阐述其生态学意义。

英文摘要:

Studies of transient dynamics captures the time history of any dramatic changes in the dynamics of a system. The transient dynamics is investigated here in a classic ecological model of a bistable tri-trophic food chain. All the species in the food chain either coexist or undergoes a partial extinction with the loss of predator after a transient time that depends upon the initial density of species populations. The distribution of transient time of extinction of the predator in response to initial states shows interesting pattern of inhomogeneity and anisotropy in the basin of predator-fee state. Precisely, the distribution shows a multimodal character when the initial points are near the basin boundary, and unimodal at locations far from the border. The distribution is also anisotropic in the sense that the number of modes depends on the direction from the basin location. We define two new metrics, viz., homogeneity index and local isotropic index to characterize the distinctive features of the distribution. The inhomogeneity of distribution reduces significantly with resource enrichment, however, a similar change in anisotropy is relatively low. We try to explain the origin of such multimodal distributions from the dynamical system perspectives and present its ecological implications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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