Shifting limitation of primary production: experimental support for a new model in lake ecosystems.,Ecology Letters

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Shifting limitation of primary production: experimental support for a new model in lake ecosystems.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-09-18 , DOI: 10.1111/ele.13606
Carly R Olson ₁ , Christopher T Solomon ₂ , Stuart E Jones ₁

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The limits on primary production vary in complex ways across space and time. Strong tests of clear conceptual models have been instrumental in understanding these patterns in both terrestrial and aquatic ecosystems. Here we present the first experimental test of a new model describing how shifts from nutrient to light limitation control primary productivity in lake ecosystems as hydrological inputs of nutrients and organic matter vary. We found support for two key predictions of the model: that gross primary production (GPP) follows a hump‐shaped relationship with increasing dissolved organic carbon (DOC) concentrations; and that the maximum GPP, and the critical DOC concentration at which the hump occurs, are determined by the stoichiometry and chromophoricity of the hydrological inputs. Our results advance fundamental understanding of the limits on aquatic primary production, and have important applications given ongoing anthropogenic alterations of the nutrient and organic matter inputs to surface waters.

中文翻译：

初级生产的转移局限性：对湖泊生态系统新模式的实验性支持。

初级生产的限制在不同的时空之间以复杂的方式变化。对清晰概念模型的强大测试有助于理解陆地和水生生态系统中的这些模式。在这里，我们介绍了一个新模型的首次实验测试，描述了随着养分和有机质的水文输入变化，从养分向光限的转变如何控制湖泊生态系统的初级生产力。我们发现支持该模型的两个主要预测：初级生产总值（GPP）与增加的溶解有机碳（DOC）浓度呈驼峰状关系；并且最大GPP和发生驼峰的临界DOC浓度是由水文输入的化学计量和色度决定的。

更新日期：2020-11-12

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