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Experiments and evidences: jellyfish (Nemopilema nomurai) decomposing and nutrients (nitrogen and phosphorus) released

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Abstract

The aim of this study was to investigate nitrogen and phosphorus released in the process of the decomposition of giant jellyfish in the laboratory and found the evidence to verify the influence of nutrients released by the decomposition of jellyfish on the ecosystem in the field. The release of nitrogen and phosphorus from the decomposition of Nemopilema nomurai was examined in a series of experiments under different incubation conditions such as different pH values, salinity values, temperatures and nitrogen and phosphorus concentrations. The results showed that the complete decomposition of Nemopilema nomurai generally took about 4–8 d. The release of nitrogen and phosphorus from the decomposition of Nemopilema nomurai could be divided into two stages: the early stage and the later stage, although the efflux rate of nitrogen was one order more than phosphorus. In the early stage of the decomposition of Nemopilema nomurai, the concentrations of dissolved nitrogen, dissolved phosphorus, total nitrogen and total phosphorus in seawater increased rapidly, and the concentration of nitrogen could reach the highest level in the whole degradation process. In the later stage of the decomposition, the concentrations of dissolved nitrogen and total nitrogen declined slowly, while the concentration of phosphorus in water could reach a maximum in the degradation process. High pH, low salinity, high temperature and N/P will promote the release of nitrogen; low pH is unfavorable to the release of nitrogen but favorable to the release of phosphorus. In addition, we found the concentrations of ammonium and phosphate in the bottom water were higher than those in the surface water during the period of jellyfish bloom in the Jiaozhou Bay, proving that nutrients released by the decomposition of jellyfish have significant influence on nitrogen and phosphorus in the field. For the whole Yellow Sea, nutrients released by jellyfish carcasses may reach up to (2.63±2.98)×107 mol/d of dissolved nitrogen (DN) and (0.74±0.84)×106 mol/d of dissolved phosphorus (DP) during the period of jellyfish bloom. The values are comparable to riverine inputs in a day, but much higher than sediment–water exchange flux in the Yellow Sea. The great amounts of nutrients must have significant influence on the nutrients balance of the Yellow Sea during the period of jellyfish dead and decomposition. Both the experimental data and field observations proved that the decomposition of jellyfish may release a great amount of nutrient to the surrounding environment during the period of jellyfish decomposition.

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Authors and Affiliations

  1. Institute of Oceanography, Chinese Academy of Sciences, Qingdao, 266071, China

    Xuegang Li, Jinming Song, Qingxia Ma, Ning Li, Huamao Yuan, Liqin Duan & Baoxiao Qu

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Qingxia Ma & Baoxiao Qu

Authors
  1. Xuegang Li
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  2. Jinming Song
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  3. Qingxia Ma
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  4. Ning Li
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  5. Huamao Yuan
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  6. Liqin Duan
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  7. Baoxiao Qu
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Corresponding author

Correspondence to Jinming Song.

Additional information

Foundation item: The National Natural Science Foundation of China under contract No. 41376092; the National Key Project for Basic Research of China under contract No. 2011CB403602; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030202.

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Li, X., Song, J., Ma, Q. et al. Experiments and evidences: jellyfish (Nemopilema nomurai) decomposing and nutrients (nitrogen and phosphorus) released. Acta Oceanol. Sin. 34, 1–12 (2015). https://doi.org/10.1007/s13131-015-0703-y

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  • DOI: https://doi.org/10.1007/s13131-015-0703-y

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