Multiple phase transitions shape biodiversity of a migrating population
Multiple phase transitions shape biodiversity of a migrating population
复制标题
多个相变塑造了迁徙人口的生物多样性
DOI：
10.1103/physreve.107.034405
复制
发表时间：
2023
影响因子：
2.4
通讯作者：
Wang, Shenshen
中科院分区：
文献类型：
--
作者：
Barkan, Casey O.;Wang, Shenshen
在各种各样的自然系统中，密切相关的微生物菌株稳定共存，导致高水平的精细尺度生物多样性。然而，稳定这种共存的机制尚未完全了解。空间异质性是一种常见的稳定机制，但生物体在异质环境中分散的速度可能会强烈影响异质性所能提供的稳定效果。一个有趣的例子是肠道微生物组，其中活性机制影响微生物的运动并可能保持多样性。我们研究了生物多样性是如何影响迁移率使用一个简单的进化模型与异质选择压力。我们发现，生物多样性的迁移率的关系是由多个相变，包括一个重入相变共存。在每一次转变中，一个生态类型灭绝，动态表现出临界减速（CSD）。CSD被编码在由于人口统计噪声的波动统计中，这可能提供一种检测和改变即将到来的灭绝的实验手段。
In a wide variety of natural systems, closely related microbial strains coexist stably, resulting in high levels of fine-scale biodiversity. However, the mechanisms that stabilize this coexistence are not fully understood. Spatial heterogeneity is one common stabilizing mechanism, but the rate at which organisms disperse throughout the heterogeneous environment may strongly impact the stabilizing effect that heterogeneity can provide. An intriguing example is the gut microbiome, where active mechanisms affect the movement of microbes and potentially maintain diversity. We investigate how biodiversity is affected by migration rate using a simple evolutionary model with heterogeneous selection pressure. We find that the biodiversity-migration rate relationship is shaped by multiple phase transitions, including a reentrant phase transition to coexistence. At each transition, an ecotype goes extinct and dynamics exhibit critical slowing down (CSD). CSD is encoded in the statistics of fluctuations due to demographic noise—this may provide an experimental means for detecting and altering impending extinction.