The overgrowth of epiphytic Ulva prolifera during seedling cultivation of Sargassum hemiphyllum can be mitigated by regulating nitrogen availability

文献类型： 外文期刊

第一作者： Han, Tingting

作者： Han, Tingting;Shi, Rongjun;Qi, Zhanhui;Huang, Honghui;Qi, Zhanhui;Huang, Honghui

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关键词： Sargassum hemiphyllum; Ulva prolifera; Growth; Tissue N content; Competitive capacity

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2021 年 543 卷

页码：

收录情况： SCI

摘要： Sargassum hemiphyllum is a common species in many countries of the world. Its culture is both economically and ecologically important. Ulva prolifera is an annoying macro-epiphyte during seedling cultivation of S. hemiphyllum and becomes a bottleneck for the successful production of Sargassum seedlings. The present study aimed to develop an effective control method of U. prolifera. The performances of the two macroalgae cultivated under co-culture and mono-culture mode using NO3xe213; or NH4+ as nitrogen resource were evaluated to test whether the U. prolifera could be inhibited through manipulation of nitrogen availability. Increasing NO3xe213; and NH4+ concentrations accelerated the growth and tissue N accumulation in U. prolifera better than in S. hemiphyllum. However, the maximum growth rate of U. prolifera at infinite tissue N contents was about 70% higher than that of S. hemiphyllum, and the critical N content (NC) of U. prolifera was about twice that of S. hemiphyllum, indicating a higher risk of N limitation for U. prolifera than for S. hemiphyllum. In co-culture mode, when cultivated with 5 and 10 mu M NO3xe213; or 5 mu M NH4+, the tissue N content of S. hemiphyllum was comparable to or higher than its NC, whereas the tissue N content of U. prolifera was much lower than its NC; the growth rate, chlorophyll a and soluble protein contents of U. prolifera were lower than its corresponding values in mono-culture mode. The inhibition effect of S. hemiphyllum on U. prolifera was highest in the cultivation medium with 5 mu M NO3xe213; . This suggested that the competitive advantage of epiphytic U. prolifera can to some extent be mitigated by manipulating nitrogen availability in cultivation medium. We recommend using NO3xe213; as the N resource, and set the N concentration at approximately 5-10 mu M in cultivation medium.

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