Resource limitation determines temperature response of unicellular plankton communities
Resource limitation determines temperature response of unicellular plankton communities
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DOI：
10.1002/lno.11140
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发表时间：
2019-02
影响因子：
4.5
通讯作者：
Camila Serra‐Pompei;G. Hagstrom;André W. Visser;K. H. Andersen
中科院分区：
文献类型：
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作者：
Camila Serra‐Pompei;G. Hagstrom;André W. Visser;K. H. Andersen
温暖的海洋将改变浮游生物的生理速率，改变浮游生物群落组成，进而影响生态系统功能，如初级生产，再循环和碳输出。为了预测温度变化如何影响浮游生物群落动力学和功能，我们开发了一个基于单细胞浮游生物（自异质兼养原生生物和细菌）的机械特性模型。温度依赖性是在细胞过程中而不是在物种水平上具体实现的。由于资源的吸收和代谢过程具有不同的温度依赖性，热环境的变化将有利于在光合作用和生物合成等过程中具有不同投资的生物。然而，投资的确切水平是有条件的限制过程，并最终动态地决定了竞争和捕食内的新兴社区的水柱。我们展示了温度的升高如何通过改变生物体的相互作用来加强营养限制，并减少群落中的相对细胞大小。此外，我们预计，温度和资源限制的结合会降低生态系统捕获碳的效率，这是由于微生物循环的加强。通过明确表示温度对负责生长的性状的影响，我们展示了如何在个人层面上的变化可以扩大到生态系统层面的趋势，有助于区分温度对自然浮游生物群落的直接间接影响。
A warmer ocean will change plankton physiological rates, alter plankton community composition, and in turn affect ecosystem functions, such as primary production, recycling, and carbon export. To predict how temperature changes affect plankton community dynamics and function, we developed a mechanistic trait‐based model of unicellular plankton (auto‐hetero‐mixotrophic protists and bacteria). Temperature dependencies are specifically implemented on cellular process rather than at the species level. As the uptake of resources and metabolic processes have different temperature dependencies, changes in the thermal environment will favor organisms with different investments in processes such as photosynthesis and biosynthesis. The precise level of investments, however, is conditional on the limiting process and is ultimately determined dynamically by competition and predation within the emergent community of the water column. We show how an increase in temperature can intensify nutrient limitation by altering organisms' interactions, and reduce relative cell‐size in the community. Further, we anticipate that a combination of temperature and resource limitation reduces ecosystem efficiency at capturing carbon due to strengthening of the microbial loop. By explicitly representing the effects of temperature on traits responsible for growth, we demonstrate how changes on the individual level can be scaled up to trends at the ecosystem level, helping to discern direct from indirect effects of temperature on natural plankton communities.