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Intraspecific variation in multiple trait responses of Alexandrium ostenfeldii towards elevated pCO2
Harmful Algae ( IF 6.6 ) Pub Date : 2021-01-15 , DOI: 10.1016/j.hal.2020.101970
Karen M. Brandenburg , Bernd Krock , Helena C.L. Klip , Appy Sluijs , Paolina Garbeva , Dedmer B. Van de Waal

Dissolved oceanic CO2 concentrations are rising as result of increasing atmospheric partial pressure of CO2 (pCO2), which has large consequences for phytoplankton. To test how higher CO2 availability affects different traits of the toxic dinoflagellate Alexandrium ostenfeldii, we exposed three strains of the same population to 400 and 1,000 µatm CO2, and measured traits including growth rate, cell volume, elemental composition, 13C fractionation, toxin content, and volatile organic compounds (VOCs). Strains largely increased their growth rates and particulate organic carbon and nitrogen production with higher pCO2 and showed significant changes in their VOC profile. One strain showed a significant decrease in both PSP and cyclic imine content and thereby in cellular toxicity. Fractionation against 13C increased in response to elevated pCO2, which may point towards enhanced CO2 acquisition and/or a downscaling of the carbon concentrating mechanisms. Besides consistent responses in some traits, other traits showed large variation in both direction and strength of responses towards elevated pCO2. The observed intraspecific variation in phenotypic plasticity of important functional traits within the same population may help A. ostenfeldii to negate the effects of immediate environmental fluctuations and allow populations to adapt more quickly to changing environments.



中文翻译:

亚历山大草p CO 2升高的多种性状响应的种内变异

由于大气中CO 2p CO 2)的分压增加,溶解的海洋CO 2浓度正在增加,这对浮游植物具有很大的影响。为了测试更高的CO 2利用率如何影响有毒的鞭毛藻ostenfeldii的不同性状,我们将三个相同种群的菌株暴露于400和1,000 µatm CO 2,并测量了性状,包括生长速率,细胞体积,元素组成,13 C分离,毒素含量和挥发性有机化合物(VOC)。菌株大大地增加其生长速率和颗粒有机碳和氮的生产具有更高的pCO 2并显示出其VOC曲线的显着变化。一株菌株显示PSP和环亚胺含量均显着降低,从而显示出细胞毒性。响应于较高的p CO 2,针对13 C的馏分增加,这可能表明CO 2的获取增加和/或碳浓缩机制的规模缩小。除了某些性状的反应一致外,其他一些性状在对p CO 2升高的反应的方向和强度上均表现出较大的差异。在同一种群中观察到的重要功能性状的表型可塑性种内变异可能有助于A. ostenfeldii 消除直接环境波动的影响,并让人们更快地适应不断变化的环境。

更新日期:2021-01-16
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