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首页> 外文期刊>Marine ecology progress series >The paradox of the plankton: species competition and nutrient feedback sustain phytoplankton diversity
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The paradox of the plankton: species competition and nutrient feedback sustain phytoplankton diversity

机译：浮游生物的悖论：物种竞争和营养反馈维持浮游植物的多样性

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摘要

The diversity of phytoplankton species and their relationship to nutrient resources are examined using a coupled phytoplankton and nutrient model for a well-mixed box. The phytoplankton community either reaches a competitive exclusion state, where there is an optimal competitor, or the abundance of each phytoplankton species continually varies in the form of repeating oscillations or irregular chaotic changes. Oscillatory and chaotic solutions make up over half of the model solutions based upon sets of 1000 separate model integrations spanning large, moderate or small random changes in the half-saturation coefficient, K_（ji）. The oscillatory or chaotic states allow a greater number of phytoplankton species to be sustained, even for their number to exceed the number of resources after additional species have been injected into the environment. The chaotic response, however, only occurs for particular model choices: when there is an explicit feedback between nutrient supply and ambient nutrient concentration, and when there are physiological differences among species, including cell quota and K_(ji). In relation to the surface ocean, the nutrient feedback can be viewed as mimicking the diffusive nutrient supply from the nutri-cline. Inter-species competition might then be important in generating chaos when this diffusive transfer is important, but less likely to be significant when other transport processes sustain surface nutrient concentrations.
机译：浮游植物物种的多样性及其与养分资源的关系，使用了一个混合箱中的浮游植物和养分耦合模型。浮游植物群落要么达到竞争排斥状态，即存在最佳竞争者，要么每种浮游植物种类的丰度以重复振荡或不规则混沌变化的形式连续变化。基于1000个独立模型积分的集合，振荡和混沌解决方案构成了模型解决方案的一半以上，这些模型跨越了半饱和系数K_（ji）的大，中或小随机变化。振荡或混乱状态使更多的浮游植物物种得以维持，即使其数量超过将其他物种注入环境后的资源数量也是如此。但是，混沌响应仅在特定的模型选择下发生：当养分供应与环境养分浓度之间存在明确的反馈时，并且物种之间存在生理差异，包括细胞配额和K_（ji）。关于海洋表层，养分的反馈可以看做是模仿营养盐对养分的扩散供应。当这种扩散转移很重要时，种间竞争可能对产生混乱很重要，但是当其他运输过程维持表面营养物浓度时，种间竞争可能就不那么重要了。

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