The Brown Algae Saccharina japonica and Sargassum horneri Exhibit Species-Specific Responses to Synergistic Stress of Ocean Acidification and Eutrophication

LIU Yuxin; CAO Jiazhen; CHU Yaoyao; LIU Yan; WANG Qiaohan; GONG Qingli; LI Jingyu

首页> 中文期刊> 《中国海洋大学学报：英文版》 >The Brown Algae Saccharina japonica and Sargassum horneri Exhibit Species-Specific Responses to Synergistic Stress of Ocean Acidification and Eutrophication

The Brown Algae Saccharina japonica and Sargassum horneri Exhibit Species-Specific Responses to Synergistic Stress of Ocean Acidification and Eutrophication

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Ocean acidification and eutrophication are two important environmental stressors.They inevitably impact marine macroalgae,and hence the coastal ecosystem of China.Saccharina japonica,as the main culture species in China,is suffering the harmful golden tide caused by Sargassum horneri.However,it remains unclear whether the detrimental effects of S.horneri on S.japonica cultivation become more severe in future acidified and eutrophic scenario.In this study,we respectively investigated the effects of pCO_(2)(400μatm and 1000μatm)and nutrients(non-enriched and enriched seawater)on the growth,photosynthesis,respiration,chlorophyll contents,and tissue nitrogen of S.japonica and S.horneri.Results indicated that enrichment of nutrients contributed S.horneri to utilize HCO_(3)^(−).The carbon acquisition pathway shifted from HCO_(3)^(−)to CO_(2) in S.japonica,while S.horneri re-mained using HCO_(3)^(−)regulated by nutrient enrichment.S.horneri exhibited better photosynthetic traits than S.japonica,with a higher level of net photosynthetic rate and chlorophyll contents at elevated pCO_(2) and enriched nutrients.Tissue nitrogen also accumulated richly in the thalli of S.horneri under higher pCO_(2) and nutrients.Significant enhancement in growth was only detected in S.horneri under synergistic stress.Together,S.horneri showed competitive dominance in current study.These findings suggest that increasing risk of golden tide in acidified and eutrophic ocean can most likely result in great damage to S.japonica cultivation.

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《中国海洋大学学报：英文版》 |2021年第5期|1253-1262|共10页
作者
LIU Yuxin; CAO Jiazhen; CHU Yaoyao; LIU Yan; WANG Qiaohan; GONG Qingli; LI Jingyu;
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作者单位

Fisheries College;

Ocean University of China;

Qingdao 266003;

China;

Key Laboratory of Mariculture;

Ministry of Education;

Ocean University of China;

Qingdao 266003;

China;

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原文格式 PDF
正文语种 chi
中图分类海洋基础科学;
关键词
eutrophication; ocean acidification; Saccharina japonica; Sargassum horneri; synergistic stress;

The Brown Algae Saccharina japonica and Sargassum horneri Exhibit Species-Specific Responses to Synergistic Stress of Ocean Acidification and Eutrophication

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