| 摘要: |
| 分析了1990年3月-1992年6月南海大鹏湾夜光藻种群数量与环境因子之间的动态关系。研究发现，夜光藻的生存水温的高限可达28.6°C左右，但其最适水温范围20-22°C，而适温范围可扩至16-25°C。所以，每年夏季高温季节，大鹏湾的夜光藻因无法忍受高温（30°C）而自然死亡，秋后再由外洋海流将其营养细胞带回。夜光藻的最适盐度应在29-33之间，但盐度的变化一般与夜光藻的种群变动没有明显的相关关系，不过暴雨或梅雨季节造成的表层水体盐度急降显然对主要分布于表层的夜光藻种群具有巨大的破坏力。为此，一个闷热和稳定无雨的气候环境对夜光藻赤潮的形成和维持起着重要的作用。虽然水体富营养程度的不断加重是水域夜光藻赤潮发生日益频繁的根本原因，但大鹏湾独特的规律性的潮汐循环（半日潮→回潮不等→全日潮→半日潮）和东南季风等产生的物理聚集同样起着重要的作用，这可能是大鹏湾成为夜光藻赤潮多发区的重要原因之一。 |
| 关键词: 赤潮 夜光藻 发生机理 种群生态 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，9389008号 |
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| THE POPULATION ECOLOGY AND CAUSATIVE MECHANISMS OF RED TIDE OF NOCHLUCA SCINHLLANS IN DAPENG BAY, THE SOUTH CHINA SEA |
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Huang Changiiang; Qi Yuzao; Huang Yihua; Un Xiaotao, Huang Changiiang; Qi Yuzao; Huang Yihua; Un Xiaotao, Huang Changiiang; Qi Yuzao; Huang Yihua; Un Xiaotao, Huang Changiiang; Qi Yuzao; Huang Yihua; Un Xiaotao
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Institute of Hydrobiology, Jinan University, Guangzhou 510632
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| Abstract: |
| Noctiluca scintillans seasonal distribution was investigated in Dapeng Bay, the South China Sea, from March 1990 to June 1992. The dynamical relationship between the Noctiluca scintillans population and its environmental factors were analyzed. The highest temperature lin1it for Noctiluca scintillans was found to 28.6°C. Optimal was l6 - 25°C. This finding suggested that Noctiluca scintillans in Dapeng Bay die naturally in the warm season because of the lethal high temperature of ca.30 °C, and its vegetative cells were brought back again by the open sea currents after fall. The density of Noctiluca scint?lans population usually did not vary so remarkably with salinity, but any abrupt and big fall in salinity due to heavy rain inevitably resulted in sharp decline or breakdown of the population in the study area. This indicated that a progressively stable and muggy weather without heavy rain is very important for the formation and maintenance of Nocfiluca scintillans blooms. Extremely weak tidal current during the periods of diurnal tide and from semidiurnal tide to diurnal inequality tide was associated with the formation of the blooms. Although increasing serious eutrophication was a basic cause for the increasing of Noctiluca scintillans blooms in the study area, mechanical convergence due to the topographical and tidal features may constitutes a direct driving force making Dapeng Bay a “high occurrence areas for Noctiluca scintillans red tide”. |
| Key words: Red-tide, Noctiluca scintillans, Causative mechanism, Population ecology |
