School of Life Science, YanTai University, YanTai, 264005, China.
Environ Sci Pollut Res Int. 2020 Jul;27(19):24272-24283. doi: 10.1007/s11356-020-08827-9. Epub 2020 Apr 18.
The invasive marine macroalga Chaetomorpha valida blooms frequently in Apostichopus japonicus culture ponds in North China, resulting in negative environmental consequences. The factors driving this algal overgrowth are unclear. Previous studies observed that eutrophication strongly influences abnormal growth of nuisance macrophytes, but relatively few studies have addressed the types and abundance of nitrogen in A. japonicus culture ponds during the seasonal progression of a C. valida bloom and the effects of nitrogen source and N/P on C. valida growth and photosynthesis. In this study, we describe the structural features of nitrogen abundance and the seasonal progression of a C. valida bloom and uncover a relationship between nitrogen enrichment and C. valida growth. Common garden experiments demonstrated that C. valida can utilize different forms of nitrogen in the environment for rapid growth. Growth rate and photosynthesis capacity were related to the nitrogen source and N/P ratio. This study will provide a reference for maintenance of ecological balance and healthy aquaculture in A. japonicus culture ponds.
中国北方的刺参养殖池塘中，常出现入侵性海洋大型海藻刚毛藻的过度生长，对环境造成负面影响。然而，导致这种藻类过度生长的因素尚不清楚。先前的研究观察到，富营养化强烈影响有害大型植物的异常生长，但相对较少的研究涉及在刚毛藻过度生长的季节性进展过程中，刺参养殖池塘中的氮的类型和丰度，以及氮源和 N/P 对刚毛藻生长和光合作用的影响。在本研究中，我们描述了氮含量的结构特征和刚毛藻过度生长的季节性进展，并揭示了氮富集与刚毛藻生长之间的关系。通过对比实验，我们发现刚毛藻可以利用环境中的不同形式的氮进行快速生长。生长率和光合作用能力与氮源和 N/P 比值有关。本研究将为维持刺参养殖池塘的生态平衡和健康养殖提供参考。
