Killer-sensitive coexistence in metapopulations of micro-organisms
Killer-sensitive coexistence in metapopulations of micro-organisms
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DOI：
10.1098/rspb.2003.2338
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发表时间：
2003-07-07
影响因子：
4.7
通讯作者：
Hoekstra, RF
中科院分区：
文献类型：
--
作者：
Czárán, TL;Hoekstra, RF
已知许多微生物能产生有效的有毒物质，对抗同种和密切相关的物种。广泛共存的杀手（毒素生产者）和敏感（非生产者）菌株是一个谜，需要一个理论解释。基于随机元胞自动机模拟和相应的半解析构型场近似模型，我们认为集合种群动力学提供了一个合理的理由，多态性的维护在生物敏感系统。毒素生产和人口增长率之间的轻微权衡足以维持有毒和敏感菌株的区域共存，如果有毒的杀戮是一个局限于小栖息地补丁和当地人口定期灭绝，并通过从邻近补丁tenonizations更新的地方现象。在这一机制中，区域规模的模式形成并不起决定性作用，但当地的互动方式至关重要。
Many micro-organisms are known to produce efficient toxic substances against conspecifics and closely related species. The widespread coexistence of killer (toxin producer) and sensitive (non-producer) strains is a puzzle calling for a theoretical explanation. Based on stochastic cellular automaton simulations and the corresponding semi-analytical configuration-field approximation models, we suggest that metapopulation dynamics offers a plausible rationale for the maintenance of polymorphism in killer-sensitive systems. A slight trade-off between toxin production and population growth rate is sufficient to maintain the regional coexistence of toxic and sensitive strains, if toxic killing is a local phenomenon restricted to small habitat patches and local populations regularly go extinct and are renewed via recolonizations from neighbouring patches. Pattern formation on the regional scale does not play a decisive part in this mechanism, but the local manner of interactions is essential.