Beyond nitrogen: phosphorus – estimating the minimum niche dimensionality for resource competition between phytoplankton,Ecology Letters

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Beyond nitrogen: phosphorus – estimating the minimum niche dimensionality for resource competition between phytoplankton
Ecology Letters ( IF 7.6 ) Pub Date : 2021-02-16 , DOI: 10.1111/ele.13695
Peter Hofmann _{1,

2} , Adam Clark _{1,

3,

4} , Petra Hoffmann _{1,

3} , Antonis Chatzinotas _{2,

3,

5} , W. Stanley Harpole _{1,

3,

6} , Susanne Dunker _{1,

3}

Affiliation

The niche dimensionality required for coexistence is often discussed in terms of the number of limiting resources. N and P limitation are benchmarks for studying phytoplankton interactions. However, it is generally agreed that limitation by small numbers of resources cannot explain the high phytoplankton diversity observed in nature. Here, we parameterised resource competition models using experimental data for six phytoplankton species grown in monoculture with nine potential limiting resources. We tested predicted species biomass from these models against observations in two‐species experimental mixtures. Uptake rates were similar across species, following the classic Redfield ratio. Model accuracy levelled out at around three to five resources suggesting the minimum dimensionality of this system. The models included the resources Fe, Mg, Na and S. Models including only N and P always performed poorly. These results suggest that high‐dimensional information about resource limitation despite stoichiometric constraints may be needed to accurately predict community assembly.

中文翻译：

除氮之外：磷–估计浮游植物之间资源竞争的最小生态位维数

通常根据限制资源的数量来讨论共存所需的利基维度。N和P限制是研究浮游植物相互作用的基准。但是，人们普遍同意，资源数量的限制不能解释自然界中浮游植物的高度多样性。在这里，我们使用实验数据对单种养殖中生长的六种浮游植物物种的参数化参数化，并具有九种潜在的限制资源。我们对照两种物种的实验混合物中的观察值，测试了这些模型预测的物种生物量。遵循经典的雷德菲尔德比率，物种间的吸收率相似。模型的精确度稳定在大约三到五个资源，这表明该系统的最小尺寸。这些模型包括铁，镁，Na和S。仅包含N和P的模型始终表现不佳。这些结果表明，尽管存在化学计量约束，但仍可能需要有关资源限制的高维信息来准确预测社区的集会。

更新日期：2021-03-16

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