Seasonal Acclimation Modulates the Impacts of Simulated Warming and Light Reduction on Temperate Seagrass Productivity and Biochemical Composition
Seasonal Acclimation Modulates the Impacts of Simulated Warming and Light Reduction on Temperate Seagrass Productivity and Biochemical Composition
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DOI：
10.3389/fmars.2021.731152
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发表时间：
2021-09-28
影响因子：
3.7
通讯作者：
Stengel, Dagmar B.
中科院分区：
文献类型：
--
作者：
Beca-Carretero, Pedro;Azcarate-Garcia, Tomas;Stengel, Dagmar B.
海水温度升高和光照质量下降已成为对包括海草生态系统在内的海洋沿海社区的一些最重要的威胁。温带海草，包括大叶藻，通常有明显的季节性周期，调节海草的生长，生理和生殖努力。这些显着的时间模式可以影响实验海草对气候变化影响的反应，这取决于进行实验的一年中的季节。本研究旨在评估季节驯化如何调节大叶藻的生产力和生化反应的实验变暖和辐照减少。海草芽暴露于不同的温度（6，12，16，20和24摄氏度），结合高（180 μ mol光子m（-2）s（-1））和低（60 μ mol光子m（-2）s（-1））的光照条件在四个季节（春季：4月，夏季：7月，秋季：2015年11月，冬季：2016年1月）。植物在16至20摄氏度之间表现出相似的温度生长速率;在24摄氏度，观察到生长急剧减少;这在寒冷的月份和低辐照条件下更加突出。较高的叶生长速率发生在冬季，而最大的根茎在春季和夏季进行的实验中达到。温度升高导致多不饱和脂肪酸（PUFA），特别是omega-3（n-3 PUFA）的显着减少。我们的研究结果强调，目前生活在温度限制下的温带海草种群将有利于未来的海表温度增加的叶和根茎生产力。结合本研究的结果，对Z.从一个温带地区的一个码头，一个更广泛的审查报告的影响，实验变暖表明，可能减少一些化合物的营养重要性较高的营养级海草叶。我们的研究结果进一步表明，来自实验室为基础的研究，调查环境压力对海草的生长和驯化，及其随后的解释，强烈影响的季节性和原位条件之前，任何实验曝光的数据。
Increases in seawater temperature and reduction in light quality have emerged as some of the most important threats to marine coastal communities including seagrass ecosystems. Temperate seagrasses, including Zostera marina, typically have pronounced seasonal cycles which modulate seagrass growth, physiology and reproductive effort. These marked temporal patterns can affect experimental seagrass responses to climate change effects depending on the seasons of the year in which the experiments are conducted. This study aimed at evaluating how seasonal acclimatization modulates productivity and biochemical responses of Zostera marina to experimental warming and irradiance reduction. Seagrass shoots were exposed to different temperatures (6, 12, 16, 20, and 24 degrees C), combined with high (180 mu mol photons m(-2) s(-1)) and low (60 mu mol photons m(-2) s(-1)) light conditions across four seasons (spring: April, summer: July, and autumn: November 2015, and winter: January 2016). Plants exhibited similar temperature growth rates between 16 and 20 degrees C; at 24 degrees C, a drastic reduction in growth was observed; this was more accentuated in colder months and under low irradiance conditions. Higher leaf growth rates occurred in winter while the largest rhizomes were reached in experiments conducted in spring and summer. Increases in temperature induced a significant reduction in polyunsaturated fatty acids (PUFA), particularly omega-3 (n-3 PUFA). Our results highlight that temperate seagrass populations currently living under temperature limitation will be favored by future increases in sea surface temperature in terms of leaf and rhizome productivity. Together with results from this study on Z. marina from a temperate region, a wider review of the reported impacts of experimental warming indicates the likely reduction in some compounds of nutritional importance for higher trophic levels in seagrass leaves. Our results further demonstrate that data derived from laboratory-based studies investigating environmental stress on seagrass growth and acclimation, and their subsequent interpretation, are strongly influenced by seasonality and in situ conditions that precede any experimental exposure.