Nutrient limitation constrains thermal tolerance in freshwater phytoplankton
Nutrient limitation constrains thermal tolerance in freshwater phytoplankton
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DOI：
10.1002/lol2.10096
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发表时间：
2018-12-01
影响因子：
7.8
通讯作者：
Yvon-Durocher, Gabriel
中科院分区：
文献类型：
--
作者：
Bestion, Elvire;Schaum, C-Elisa;Yvon-Durocher, Gabriel
热耐受性可以关键地取决于环境背景（例如，资源可得性和生物相互作用），但往往仅在理想条件下进行衡量。在这里，我们调查了磷酸盐（淡水生态系统中藻类生长的限制性资源）的浓度如何影响五种淡水浮游植物生长速率的最佳温度。我们发现，低磷酸盐浓度导致物种的最适温度急剧下降，相对于充满条件下降高达15摄氏度，下降的幅度因物种而异。预计全球环境的迅速变化将导致气温上升，而在富营养化水体中，淡水中的营养物浓度预计将增加，而在大型的缓慢系统中，营养物浓度将下降，因为这些系统会变得更温暖，分层程度更高。我们的研究结果表明，浮游植物同时经历变暖和营养限制将更容易受到环境变化的影响。
Thermal tolerance can depend critically on environmental context (e.g., resource availability and biotic interactions), yet it is often measured only under idealized conditions. Here, we investigated how the concentration of phosphate (a limiting resource for algal growth in freshwater ecosystems) influences the thermal optimum for growth rate in five species of freshwater phytoplankton. We found that low-phosphate concentrations led to a sharp decline in species' thermal optima, by up to 15 degrees C relative to replete conditions, with the magnitude of the decline varying between species. Rapid global environmental change is expected to lead to rising temperatures, while nutrient concentrations in freshwaters are forecast to increase in waterbodies subject to eutrophication and decline in large lentic systems that become warmer and more stratified. Our findings suggest that phytoplankton that experience warming and nutrient limitation concurrently will be more vulnerable to environmental change.