Thermal performance of marine diatoms under contrasting nitrate availability
Thermal performance of marine diatoms under contrasting nitrate availability
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DOI：
10.1093/plankt/fbaa054
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发表时间：
2020-11
影响因子：
2.1
通讯作者：
María Aranguren-Gassis;E. Litchman
中科院分区：
文献类型：
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作者：
María Aranguren-Gassis;E. Litchman
在全球变暖的背景下，与温度升高相互作用的环境因子是决定海洋浮游植物生长性能的一个紧迫问题。以前的研究表明，营养限制会改变浮游植物对温度的反应，并可能降低它们的最佳温度（Topt），使它们更容易受到高温的影响。这种关系的普遍性是未知的，因为很少有物种被测试过。在这里，我们研究了从不同热环境（包括热带）分离的六种海洋硅藻在两种不同氮浓度下的生长速率如何依赖于温度。低硝酸盐对6种植物中5种的热性能有显著影响。在生长的最佳温度附近，效应量较大，导致热性能曲线变平，但Topt没有移位。虽然这一趋势与每个物种被隔离的热状态无关，但浮游植物对全球变暖的反应可能取决于区域。
Environmental factors that interact with increasing temperature under the ongoing global warming are an urgent issue determining marine phytoplankton’s performance. Previous studies showed that nutrient limitation alters phytoplankton responses to temperature and may lower their temperature optima (Topt), making them more susceptible to high temperatures. The generality of this relationship is unknown, as very few species were tested. Here we investigated how growth rate depended on temperature at two contrasting nitrogen concentrations in six marine diatoms isolated from different thermal environments, including the tropics. Low nitrate had a significant effect on thermal performance in five of the six species. The effect size was larger around the optimum temperature for growth, resulting in flattened thermal performance curves but no shift in Topt. While that trend is independent of the thermal regime from which each species was isolated, the implications for the phytoplankton response to global warming may be region dependent.