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Competition between microorganisms for a single limiting resource with cell quota structure and spatial variation

机译:微生物之间对具有细胞配额结构和空间变化的单一限制资源的竞争

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摘要

Microbial populations compete for nutrient resources, and the simplest mathematical models of competition neglect differences in the nutrient content of individuals. The simplest models also assume a spatially uniform habitat. Here both of these assumptions are relaxed. Nutrient content of individuals is assumed proportional to cell size, which varies for populations that reproduce by division, and the habitat is taken to be an unstirred chemostat where organisms and nutrients move by simple diffusion. In a spatially uniform habitat, the size-structured model predicts competitive exclusion, such that only the species with lowest break-even concentration persists. In the unstirred chemostat, coexistence of two competitors is possible, if one has a lower break-even concentration and the other can grow more rapidly. In all habitats, the calculation of competitive outcomes depends on a principal eigenvalue that summarizes relationships among cell growth, cell division, and cell size.
机译:微生物种群争夺养分资源,最简单的竞争数学模型忽略了个体养分含量的差异。最简单的模型还假设了一个空间上统一的栖息地。这两个假设都放宽了。假定个体的营养含量与细胞大小成正比,细胞的大小随分裂而繁殖,而栖息地被视为未搅拌的化学恒温器,其中有机物和营养物通过简单的扩散而移动。在空间上统一的栖息地中,大小结构模型可预测竞争性排斥,因此只有盈亏平衡点浓度最低的物种才能生存。在未搅拌的恒化器中,如果一个竞争对手的收支平衡集中度较低,而另一个可以更快地成长,则两个竞争对手可能会并存。在所有生境中,竞争结果的计算取决于一个主要特征值,该特征值总结了细胞生长,细胞分裂和细胞大小之间的关系。

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