| XIAO Jie,SUN Na,ZHANG Yiwen,SUN Ping,LI Yan,PANG Min,LI Ruixiang.Heterocapsa bohaiensis sp. nov. (Peridiniales: Dinophyceae): a novel marine dinoflagellate from the Liaodong Bay of Bohai Sea, China[J].Acta Oceanologica Sinica,2018,37(10):18-27 |
| 发现于我国渤海辽东湾的海洋甲藻新种-渤海异冒藻(Heterocapsa bohaiensis sp. nov.) |
| Heterocapsa bohaiensis sp. nov. (Peridiniales: Dinophyceae): a novel marine dinoflagellate from the Liaodong Bay of Bohai Sea, China |
| 投稿时间：2017-08-01 |
| DOI：10.1007/s13131-018-1296-z |
| 中文关键词: 渤海异帽藻 新种 形态结构 ITS 辽东湾 |
| 英文关键词:Heterocapsa harmful algal bloom thecal plate body scale ITS |
| 基金项目:The NSFC-Shandong Joint Funded Project under contract No. U1406403; the National Natural Science Foundation of China under contract Nos 41506191 and 41306171. |
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| 中文摘要: |
| 一种微小的具壳甲藻在我国渤海辽东湾沿岸的养殖池内大量爆发，造成养殖对虾（Penaeus japonicus）和中华绒螯蟹（Eriocheir sinensis）幼体的死亡。利用光学、荧光和电子显微镜对分离得到的甲藻细胞进行观察，发现细胞个体较小（长14.4±1.6 μm），呈椭圆体，壳片排列为典型的异冒藻版式（Po，cp，5'，3a，7''，6c，5s，5'''，2''''），细胞上壳明显大于下壳，每个细胞1～3个淀粉核。细胞鳞片具有三角形基板，1个中心柱和9根外棘。综上所述，该藻与异冒藻属其它种类存在明显区别，被命名为渤海异冒藻。ITS和LSU基因序列分析显示，该种与其它异冒藻存在显著的遗传差异，进一步证实其为一新种。研究发现，不同的样品处理方式会导致细胞顶孔板形态的差异，在后续研究中值得注意。 |
| 英文摘要: |
| A small armed dinoflagellate bloomed in the aquaculture ponds off the coast of Liaodong Bay, Bohai Sea of China, resulting in heavy mortalities of the cultured prawns (Penaeus japonicus) and larvae of Chinese mitten handed crabs (Eriocheir sinensis). The bloom-forming species was successfully isolated, and cellular morphology of the specimen was consequently investigated through light, fluorescent and electron microscopy. The small ((14.4±1.6) μm in length) ellipsoid cells show typical Heterocapsa thecal plate arrangement (Po, cp, 5', 3a, 7'', 6c, 5s, 5''', 2''''). The episome is evidently bigger than the hyposome. One to three spherical pyrenoids are located above or beside the large elongated nucleus. The body scale is characterized by a triangle basal plate with one central upright and nine peripheral spines. Above all, Heterocapsa bohaiensis could be distinguished from other Heterocapsa species by the combination of the cell size, morphology, cellular structure and body scale. Sequence analyses of both ITS and LSU regions reveal the significant genetic divergence between H. bohaiensis and other established species in this genus, further supporting novelty of this species. Noticeably, different sample treatment methods resulted in morphological variation of the apical pore complex (APC) of H. bohaiensis, which needs to be taken into account in future study. |
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