The green tide-forming macroalga Ulva linza outcompetes the red macroalga Gracilaria lemaneiformis via allelopathy and fast nutrients uptake

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• 作者：Zhengquan Gao (1)
  Dong Xu (2)
  Chunxiao Meng (1)
  Xiaowen Zhang (2)
  Yitao Wang (3)
  Demao Li (4)
  Jian Zou (2)
  Zhimeng Zhuang (2)
  Naihao Ye (2)
  
• 关键词：Allelopathy ; Biodiversity ; Competitions ; Gracilaria lemaneiformis ; Green tide ; Ulva linza
• 刊名：Aquatic Ecology
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：48
• 期：1
• 页码：53-62
• 全文大小：790 KB
• 作者单位：Zhengquan Gao (1)
  Dong Xu (2)
  Chunxiao Meng (1)
  Xiaowen Zhang (2)
  Yitao Wang (3)
  Demao Li (4)
  Jian Zou (2)
  Zhimeng Zhuang (2)
  Naihao Ye (2)
  
  1. School of Life Sciences, Shandong University of Technology, Zibo, 255049, People’s Republic of China
  2. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, People’s Republic of China
  3. Qingdao Agricultural University, Qingdao, 266109, People’s Republic of China
  4. Tianjin Key Laboratory for Industrial Biological Systems and Bioprocessing Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
  
• ISSN：1573-5125

文摘

The objective of this study was to evaluate the interactions between green tide-forming macroalgae Ulva linza and red macroalgae Gracilaria lemaneiformis in the laboratory. The results demonstrated that the presence of U. linza can restrict growth (9-1?%) and photosynthesis (25-5?%) of G. lemaneiformis. In contrast, G. lemaneiformis had little apparent effect on the growth of U. linza. Culture medium experiments confirmed that allelochemicals may be released by both the tested macroalgae. The causative mechanism for the growth and photosynthesis inhibition of G. lemaneiformis was not light limitation nor increase of pH, but a combination of allelopathic effects of U. linza and nutrient competition between the two macroalgae. Moreover, the “green tide-macroalga U. linza was a stronger competitor for nutrient than G. lemaneiformis. The results from this study provide evidence for the mechanisms of “green tide-formation by U. linza: potent allelopathic effects on G. lemaneiformis and faster nutrients uptake than its competitors.