Study on the process, causes and effects of a Gymnodinium catenatum bloom in the coastal waters of Fujian Province in 2017
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摘要: 本文于2017年6月9~15日对发生在福建省惠安县沿海的一次链状裸甲藻(Gymnodinium catenatum)赤潮过程进行研究,共布设6个站位开展7个航次的海洋环境跟踪监测,并选取同年6月6日的水质和3月、11月的浮游植物数据同赤潮监测结果进行对比;同时结合甲藻包囊和养殖贝类的麻痹性贝毒(PSP)调查结果,探索休眠包囊与赤潮生消的关系,以期掌握养殖贝类体内PSP毒素的累积和排出规律。研究结果表明,赤潮发生时,天气晴朗,海况良好,水温和盐度分别介于24.2~26.8℃和30.4~33.2之间,营养盐含量较低,为贫营养水平,赤潮生物密度最高达到1.79×106 cells/L,适宜的水文气象条件和N/P以及链状裸甲藻的营养模式为赤潮的发生提供了基础,而恶劣的气象条件是导致赤潮消亡的主要原因。调查海域链状裸甲藻包囊平均密度为33.2 cysts/g,并有可能重新萌发成营养细胞,具有重新暴发赤潮的潜在性,需要引起重视。赤潮时牡蛎和贻贝短时间内即可富集高浓度的PSP毒素,并与赤潮生物的密度呈正比;低密度的链状裸甲藻也有可能引发PSP毒素超标;贻贝对PSP毒素具有富集快排出慢的特点,且富集能力远高于牡蛎,而排出速度则是明显较牡蛎慢。Abstract: During June 9 to 15 2017, the dynamic of Gymnodinium catenatum bloom along the coast of Hui'an County, Fujian Province, were investigated. Six monitoring stations were established for marine environmental factors assessment over seven sampling trips. The water quality data from June 6, along with the phytoplankton data collected in March and November 2017, were selected for comparative analysis. Furthermore, the survey results of dinoflagellate cysts and paralytic shellfish poison (PSP) in cultured shellfish were integrated to explore the relationship between dormant cysts and the bloom dynamics, as well as the patterns of PSP accumulation and elimination in cultured shellfish. The results revealed that during the bloom, conditions were characterized by sunny weather and favorable sea states, with water temperature ranging from 24.2 to 26.8°C and the salinity between 30.4 and 33.2. The concentrations of nutrients were low, indicating oligotrophic conditions, while the density of G. catenatum peaked at 1.79×106 cells/L during the bloom period. The interplay of favorable hydro-meteorological conditions, N/P ratio, and the trophic pattern of G. catenatum provided a basis for the evolution of the bloom, whereas adverse weather conditions primarily contributed to its decline. The average density of G. catenatum cysts in the surveyed sea area was 33.2 cysts/g, suggesting a potential for these cysts to germinate into trophic cells, which could lead to the reemergence of the bloom and therefore necessitates further attention. During the bloom period, both oysters and mussels rapidly accumulated high concentrations of PSP toxins, with levels directly proportional to G. catenatum density. . Additionally, even low densities of G. catenatum posed a risk for PSP exceedances. Mussels exhibited a rapid accumulation and slow elimination of PSP, with a significantly greater capacity for toxin accumulation compared to oysters, while their elimination rate was significantly slower.
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Key words:
- Gymnodinium catenatum /
- red tide /
- resting cysts /
- PSP
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表 1 贻贝样品PSP检测结果
Tab. 1 Results of PSP detection in mussel samples
采样时间 采样地点 样品种类 PSP(Mu/100g) 2017−06−12 崇武 贻贝 6344.8 2017−06−19 崇武 贻贝 1486.0 2017−06−26 崇武 贻贝 2288 2017−07−03 崇武 贻贝 354.6 2017−07−10 崇武 贻贝 2240.0 2017−07−17 崇武 贻贝 1689.2 2017−07−24 崇武 贻贝 275.1 2017−08−03 崇武 贻贝 2638.3 2017−08−08 崇武 贻贝 655.7 2017−08−14 崇武 贻贝 315.2 2017−08−21 崇武 贻贝 ND 2017−08−28 崇武 贻贝 ND 注:ND表示未检出,下同。 表 2 牡蛎样品PSP检测结果
Tab. 2 Results of PSP detection in oyster samples
采样时间 样品种类 PSP(Mu/100g) 崇武 大港湾 东周半岛 2017−06−12 牡蛎 5405.4 589.4 5263.8 2017−06−19 牡蛎 651.6 355 766.3 2017−06−26 牡蛎 ND ND 221.3 2017−07−03 牡蛎 ND ND 184.1 2017−07−10 牡蛎 ND 2017−07−17 牡蛎 ND -
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