Decreased Irradiance and Nutrient Enrichment Mitigate the Negative Effect of Ocean Warming on Growth and Biochemical Compositions of a Canopy-Forming Marine Macroalga
Decreased Irradiance and Nutrient Enrichment Mitigate the Negative Effect of Ocean Warming on Growth and Biochemical Compositions of a Canopy-Forming Marine Macroalga
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DOI：
10.3390/jmse10040479
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发表时间：
2022-04-01
影响因子：
2.9
通讯作者：
Aoki, Masakazu N.
中科院分区：
文献类型：
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作者：
Charan, Harshna;Inomata, Eri;Aoki, Masakazu N.
全球变暖下的热浪对生态系统初级生产者产生了负面影响。这种变暖效应可能会被当地环境(如光照和养分供应)协同或拮抗。然而，关于气候变暖、光照和营养物质对沿海生态系统中占主导地位的海洋大型藻类的生理影响的相互作用，人们知之甚少。研究了增温(23℃和26℃)、光照(30和150亩分子光子m(-2)S(-1))和营养物质(富营养化和非富集化)对形成冠层的海洋大型藻羊栖菜的特定生长率和生化组成的影响。增温对SGR和叶绿素(Chl)c/Chla比值的负面影响可被光照减弱所拮抗。此外，温度升高对碳含量的负面影响也被营养物质的富集化所拮抗。这些结果表明，气候变暖对该物种生长和碳积累的影响可以通过减少光照和营养丰富来缓解。
Heatwaves under global warming have negative impacts on ecosystem primary producers. This warming effect may be synergized or antagonized by local environments such as light and nutrient availability. However, little is known about the interactive effects of warming, irradiance, and nutrients on physiology of marine macroalgae, which are dominant in coastal ecosystems. The present study examined the combined effects of warming (23 and 26 degrees C), irradiance (30 and 150 mu mol photon m(-2) s(-1)), and nutrients (enriched and non-enriched) on specific growth rate (SGR) and biochemical compositions of the canopy-forming marine macroalga Sargassum fusiforme. The negative effect of warming on SGR and ratio of chlorophyll (Chl) c to Chl a was antagonized by decreased irradiance. Moreover, the negative effect of temperature elevation on carbon content was antagonized by nutrient enrichment. These results suggest that the effect of warming on the growth and carbon accumulation of this species can be mitigated by decreased irradiance and nutrient enrichment.