Evaluation for the role of Noctiluca scintillans on the material circulation in the Coastal Sea

夜光藻对近海物质循环的作用评价

• 批准号: 07680556
• 负责人: MONTANI Shigeru
• 金额: $ 1.47万
• 依托单位: Kagawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680556/
• 关键词: Noctiluca; Coastal Sea; Material Circulation; Nutrient; 栄養塩類

Noctiluca scintillans are widely distributed throughout whole oceans in the world and are also known to live in the Seto Inland Sea throughout the year, especially from spring to summer. It was recognized that ammonia included in high concentration in cellular fluid was toxic to fish and an extra-ordinary mass development of this species can cause severe damages to coastal fish farming. On the other hand, this heterotrophic dinoflagellate may act as one of the most important organisms contributing to nitrogen and phosphorus cycle in the coastal sea because of its significantly high content of ammonium nitrogen and phosphate.Ammonium nitrogen, phosphate, and silicate concentrations in cell fluid were estimated at 2470,183, and 54 pmol ind^<-1>, respectively. Particulate C : N : P ratio of the natural cells of the species was estimated at 143 : 14 : 1. Ammonium nitrogen and phosphate concentrations at surface layr of the water column seemed to be related to cell abundance of N.scintillans at the sampling location. Patches of N.scintillans provided 16 and 25 times of ammonium nitrogen and phosphate, respectively, in the uppermost layr (0-10 cm depth) of the water column, higher than those which contained in the ambient sea water. Silicate concentration within patches, however, was close to that in surrounding water. Morphological of fecal pellet of N.scintillans fed on the diatom, Thalassiosira sp., was examined by a scanning electron microscope. Fecal pellet composed entirely of intact diatom cells. It could be inferred that cells excrete silica as fecal pellcts and thus no remarkably high silicate concentration within red tide patches was observed. Relcased nutrients by N.scintillans at the uppermost part of the water column could be subsequently utilized by other autotrophic species living at the sea surface where light and carbon sources are available.

夜luca scintillans在世界各大洋中都有广泛的分布，并且在濑户内海全年都有生活，特别是从春天到夏天。人们认识到，细胞液中含有高浓度的氨对鱼类是有毒的，该物种的异常大量发展会对沿海渔业造成严重损害。另一方面，这种异养鞭毛藻因其高含量的铵态氮和磷酸盐而可能成为沿海海氮磷循环的重要生物之一。细胞液中铵态氮、磷酸盐和硅酸盐的浓度分别估计为2470、183和54 pmol ind^<-1>。该树种天然细胞中颗粒C: N: P比值为143:14:1。水柱表层的铵态氮和磷酸盐浓度似乎与采样位置的闪螺细胞丰度有关。在水柱最上层（0 ~ 10 cm深度），闪烁螺斑块提供的铵态氮和磷素分别是水体中铵态氮和磷素的16倍和25倍，高于环境海水。然而，斑块内的硅酸盐浓度与周围水体接近。用扫描电镜观察了以硅藻为食的褐藻（Thalassiosira sp.）粪球的形态。完全由完整的硅藻细胞组成的粪便颗粒。可以推断，细胞以粪便颗粒的形式排出二氧化硅，因此在红潮斑块内没有观察到明显的高硅酸盐浓度。浮游生物在水柱最上层重新释放的营养物质随后可以被生活在有光和碳源的海面上的其他自养物种利用。

项目成果

Montani, S., Pithakpol, S.and Tada, K.: "Nutrient regeneration in the coastal sea by Noctiluca scintillans, a red tide causing dinoflagellate" Journal of Applied Phycology. (in press).

Montani, S.、Pithakpol, S.和 Tada, K.：“夜光藻在沿海海域的营养再生，这是一种引起甲藻的赤潮”应用藻类学杂志。

S.Montani et al.: "Nutrient regenaration in the coastal sca by Noctiluca scimtillans a red tide causing dinoflagellate" Journal of Applied Phycology. (印刷中). (1997)

S. Montani 等人：“Noctiluca scimtillans 引起的甲藻引起的沿海藻类的营养再生”《应用藻类学杂志》（1997 年出版）。

S.Montani et al.: "Nutrient regenaration in the coastal sea by Noctiluca scimtillans,a red tide causing dinoflagellate" Journal of Applied Phycology. (印刷中). (1997)

S. Montani 等人：“夜光藻（Noctiluca scimtilans）在沿海海域的营养再生，这是一种引起甲藻的赤潮”，应用藻类学杂志（1997 年出版）。