Chu Yaoyao, Liu Yan, Li Jingyu, Gong Qingli
College of Fisheries, Ocean University of China, Qingdao, Shandong, China.
The Key Laboroatory of Mariculture (Ocean University of China), Ministry of Education, Qingdao, Shandong, China.
PeerJ. 2019 Nov 27;7:e8040. doi: 10.7717/peerj.8040. eCollection 2019.
Ocean acidification and eutrophication are two major environmental issues affecting kelp mariculture. In this study, the growth, photosynthesis, and biochemical compositions of adult sporophytes of were evaluated at different levels of pCO (400 and 800 µatm) and nutrients (nutrient-enriched and non-enriched seawater). The relative growth rate (RGR), net photosynthetic rate, and all tested biochemical contents (including chlorophyll (Chl) , Chl , soluble carbohydrates, and soluble proteins) were significantly lower at 800 µatm than at 400 µatm pCO. The RGR and the contents of Chl and soluble proteins were significantly higher under nutrient-enriched conditions than under non-enriched conditions. Moreover, the negative effects of the elevated pCO level on the RGR, net photosynthetic rate, Chl and the soluble carbohydrates and proteins contents were synergized by the elevated nutrient availability. These results implied that increased pCOcould suppress the growth and biochemical composition of adult sporophytes of . The interactive effects of ocean acidification and eutrophication constitute a great threat to the cultivation of due to growth inhibition and a reduction in quality.
海洋酸化和富营养化是影响海带养殖的两个主要环境问题。在本研究中，在不同的pCO₂水平（400和800微大气压）和营养水平（富营养化海水和非富营养化海水）下，对海带成年孢子体的生长、光合作用和生化组成进行了评估。在800微大气压下，相对生长率（RGR）、净光合速率以及所有测试的生化含量（包括叶绿素（Chl）a、Chl b、可溶性碳水化合物和可溶性蛋白质）均显著低于400微大气压下的值。在富营养化条件下，RGR以及Chl a和可溶性蛋白质的含量显著高于非富营养化条件下的含量。此外，升高的pCO₂水平对RGR、净光合速率、Chl a以及可溶性碳水化合物和蛋白质含量的负面影响因营养有效性的提高而加剧。这些结果表明，升高的pCO₂会抑制海带成年孢子体的生长和生化组成。由于生长受到抑制和品质下降，海洋酸化和富营养化的交互作用对海带养殖构成了巨大威胁。
