| 摘要: |
| 孢囊是甲藻生活史中特殊的休眠阶段,被认为是赤潮发生的种源。于2018年4月采集了福建福宁湾海域表层沉积物,对沉积物中甲藻孢囊的分布规律进行了研究,重点揭示有毒有害甲藻孢囊的分布;同时测定了沉积物中生源要素含量,以揭示孢囊分布与生源要素的关系。共鉴定甲藻孢囊25种,其中别什藻(Biecheleria tirezensis)孢囊占据优势。孢囊的种类多样性指数(H')偏低,为2.06~2.34;均匀度指数(J)为0.71~0.81。孢囊密度介于178.6~386.3 cysts/g (以干重计,下同),平均为286.0cysts/g。孢囊密度高值区位于水深较深、沉积物颗粒较细的长表岛外海域,而低值区则位于长表岛至海尾角的近岸海域。值得注意的是,研究分析鉴定出9种有毒有害甲藻的孢囊,包括麻痹性贝类毒素(paralytic shellfish poisoning,PSP)原因种奥氏亚历山大藻(Alexandrium ostenfeldii)和链状/塔玛亚历山大藻(Alexandrium catenella/tamarense)孢囊复合体、goniodomine A原因种平野亚历山大藻(Alexandrium hiranoi)、虾夷扇贝毒素(yessotoxin,YTX)原因种具刺膝沟藻(Gonyaulax spinifera)和网状原角藻(Protoceratium reticulatum)、产生鱼毒素的哈曼褐多沟藻(Pheopolykrikos hartmannii)以及赤潮藻类Barrufeta bravensis、锥状斯氏藻(Scrippsiella acuminata)和垂裂莱万藻(Levanderina fissa),其中Barrufeta bravensis、Gonyaulax spinifera和Scrippsiella acuminata的孢囊分布广泛且密度较高,需引起关注。 |
| 关键词: 甲藻孢囊 福宁湾 沉积物 生源要素 有毒有害赤潮 |
| DOI：10.11693/hyhz20220200036 |
| 分类号: |
| 基金项目:科技基础资源调查专项,2018FY100200号;国家自然科学基金,42076141号。 |
附件 |
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| DIVERSITY AND DISTRIBUTION OF DINOFLAGELLATE CYSTS IN SURFACE SEDIMENTS IN FUNING BAY, FUJIAN, CHINA |
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WANG Zhao-Hui, ZHENG Hu, WANG Wen-Ting, XIE Chang-Liang, JI Shuang-Hui, ZHANG Yu-Ning
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Department of Ecology, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
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| Abstract: |
| Cysts are a specific dormant stage in dinoflagellate life history and are considered as the "seed bed" of algal blooms. Surface sediments were collected from the Funing Bay, Fujian, China in April 2018. Dinoflagellate cysts in the sediment samples were studied focusing on the distribution of toxic and harmful dinoflagellate cysts. The contents of biogenic elements were analyzed to reveal relationships between cysts and biogenic elements. Twenty-five cyst taxa were identified, and cysts of Biecheleria tirezensis dominated in the sediments. Shannon-Wiener diversity index (H') ranged 2.06~2.34, and Pielou's evenness index (J) ranged 0.71~0.81. Cyst concentrations ranged 178.6~386.3 cysts/g (in dry weight) on average of 286.0 cysts/g. Cyst concentrations were higher in the stations with finer clay sediment and greater water depth, and cyst concentrations were low in shallow coastal area with coarse sediments. Notably, nine toxic and/or harmful dinoflagellate cysts were identified, including cysts of paralytic shellfish toxin (PSP) producers Alexandrium ostenfeldii and A. catenella/tamarense, the goniodomine A producer Alexandrium hiranoi, the yessotoxin (YTX) producers Gonyaulax spinifera and Protoceratium reticulatum, the ichthyotoxic species Pheopolykrikos hartmannii, and the bloom species Barrufeta bravensis, Scrippsiella acuminate, and Levanderina fissa. Among them, cysts of Barrufeta bravensis, Gonyaulax spinifera, and Scrippsiella acuminata occurred widely and abundantly, which shall be concerned. |
| Key words: dinoflagellate cysts Funing Bay sediment biogenic elements harmful algal bloom |
