Regeneration and utilization of nutrients during collapse of a Mesodinium rubrum red tide and its influence on phytoplankton species composition
文献类型：CNKI期刊论文
| 作者 | Yafeng ZHANG; Xiuxian SONG ; Paul J.HARRISON; Sheng LIU; Zhiming YU; Jinjun KAN; Peiyuan QIAN; Hao LIU; Kedong YIN
|
| 发表日期 | 2018-10-01 |
| 出处 | Science China(Earth Sciences)
 |
| 关键词 | Red tides Species composition Nutrients Regeneration Mesodinium rubrum |
| 英文摘要 | High-biomass red tides occur frequently in some semi-enclosed bays of Hong Kong where ambient nutrients are not high enough to support such a high phytoplankton biomass. These high-biomass red tides release massive inorganic nutrients into local waters during their collapse. We hypothesized that the massive inorganic nutrients released from the collapse of red tides would fuel growth of other phytoplankton species. This could influence phytoplankton species composition. We tested the hypothesis using a red tide event caused by Mesodinium rubrum(M. rubrum) in a semi-enclosed bay, Port Shelter. The red tide patch had a cell density as high as 5.0×10~5 cells L~(-1), and high chlorophyll a(63.71 μg L~(-1)). Ambient inorganic nutrients(nitrate:NO_3~-, ammonium: NH_4~+, phosphate: PO_4~(3-), silicate: SiO_4~(3-)) were low both in the red tide patch and the non-red-tide patch(clear waters outside the red tide patch). Nutrient addition experiments were conducted by adding all the inorganic nutrients to water samples from the two patches followed by incubation for 9 days. The results showed that the addition of inorganic nutrients did not sustain high M. rubrum cell density, which collapsed after day 1, and did not drive M. rubrum in the non-red-tide patch sample to the same high-cell density in the red tide patch sample. This confirmed that nutrients were not the driving factor for the formation of this red tide event, or for its collapse. The death of M. rubrum after day 1 released high concentrations of NO_3~-,PO_4~(3-), SiO_4~(3-), NH_4~+, and urea. Bacterial abundance and heterotrophic activity increased, reaching the highest on day 3 or 4, and decreased as cell density of M. rubrum declined. The released nutrients stimulated growth of diatoms, such as Chaetoceros affinis var. circinalis, Thalassiothrix frauenfeldii, and Nitzschia sp., particularly with additions of SiO_4~(3-) treatments, and other species. These results demonstrated that initiation of M. rubrum red tides in the bay was not directly driven by nutrients.However, the massive inorganic nutrients released from the collapse of the red tide could induce a second bloom in low-ambient nutrient water, influencing phytoplankton species composition. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the Guangdong-National Science Foundation of China (Grant Nos. U1701247) ; the National Natural Science Foundation of China (Grant Nos. 91328203) ; the International Science and Technology Cooperation Program of Guangdong (Grant No. 2013B051000042) ; Xiuxian Song was supported by the National Natural Science Foundation of China (Grant Nos. 50339040 & 40025614) |
| 卷 | v.61期:10页:32-44 |
| 语种 | 英文; |
| 分类号 | Q948.8;X173;X145 |
| ISSN号 | 1674-7313 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/188796]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.DivisionofLifeScience,HongKongUniversityofScienceandTechnology 2.SchoolofMarineSciences,SunYat-SenUniversity 3.KeyLaboratoryofMarineEcologyandEnvironmentalSciences,InstituteofOceanology,ChineseAcademyofSciences 4.DepartmentofEarth,Ocean&AtmosphericSciences,UniversityofBritishColumbia 5.KeyLaboratoryofTropicalMarineEnvironmentalDynamics,SouthChinaSeaInstituteofOceanology,ChineseAcademyofSciences 6.MicrobiologyDivision,StroudWaterResearchCenter,970SpencerRoad |
| 推荐引用方式 GB/T 7714 | Yafeng ZHANG,Xiuxian SONG,Paul J.HARRISON,et al. Regeneration and utilization of nutrients during collapse of a Mesodinium rubrum red tide and its influence on phytoplankton species composition. 2018. |
入库方式： OAI收割
来源：海洋研究所
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