The performance and survival of macroalgae is largely determined by their ability to adjust to varying environmental conditions. In this study, we investigated the short-term response of the giant kelp Macrocystis pyrifera to varying temperatures (6, 17 and 24 °C) and low and high nitrate conditions (5 μM and 80 μM nitrate) on lipid and fatty acid levels. Results revealed that M. pyrifera was able to rapidly adjust to varying temperatures by changing the saturation level of the fatty acid composition at low and high nitrate conditions. On a lipid level, we observed interactive effects of temperature and nutrient conditions. Under high nitrate conditions, M. pyrifera maintained the same lipid profile. However, under low nitrate and high temperature conditions, an increase in free fatty acids (FFA) was observed, indicative of lipid degeneration at high temperatures. Results show that low nitrogen concentrations can magnify the negative effects of short term temperature stress in the giant kelp M. pyrifera. Our findings indicate that under rapid warming events, local nitrate availability might be a decisive factor for the acclimation potential of M. pyrifera.

大型藻类的性能和存活率很大程度上取决于它们适应各种环境条件的能力。在这项研究中，我们调查了巨海藻Macrocystis pyrifera对脂质和脂肪酸水平变化的温度（6、17和24°C）以及低和高硝酸盐条件（5μM和80μM硝酸盐）的短期响应。结果显示，M。通过在低和高硝酸盐条件下改变脂肪酸组成的饱和度水平，发火虫能够迅速适应不同的温度。在脂质水平上，我们观察到温度和营养条件的相互作用。在高硝酸盐条件下，M。萤火虫保持相同的脂质分布 但是，在低硝酸盐和高温条件下，观察到游离脂肪酸（FFA）的增加，表明高温下脂质会变性。结果表明，低氮浓度可以放大巨型海带M短期温度胁迫的负面影响。萤火虫。我们的发现表明，在快速变暖事件下，局部硝酸盐的有效性可能是M适应环境的决定性因素。萤火虫。