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首页> 外文期刊>Harmful Algae >Morphology and germination characteristics of the cysts of Chattonella ovata (Raphidophyceae), a novel red tide flagellate in the Seto Inland Sea, Japan
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Morphology and germination characteristics of the cysts of Chattonella ovata (Raphidophyceae), a novel red tide flagellate in the Seto Inland Sea, Japan

机译：日本濑户内海的一种新型赤潮鞭毛虫卵小儿Chattonella ovata（Raphidophyceae）囊肿的形态和发芽特征

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To elucidate the mechanism of bloom outbreaks of Chattonella ovata (Raphidophyceae), we investigated the cysts of C. ovata and succeeded in finding them from the bottom sediments of Hiroshima Bay. The morphology of the cysts was mostly hemispherical in shape, with a diameter of ca. 30 μm and height of ca. 20 μm. The cysts were usually adhering to solid materials, such as diatom frustules, yellow-greenish in color and had several dark brown grains. The cyst wall was smooth and had no ornamentation. Because the morphological characteristic of the cysts was in general agreement with those of Chattonella antiqua and Chattonella marina, it was difficult to differentiate the cysts of these three species. Germination of the cysts of C. ovata was observed at temperatures from 17.5 to 30 ℃, but not at 15 ℃ or below. The number of the germinated cysts increased with increasing temperature and the optimum temperature for germination was 30 ℃. Although cysts of C. antiqua and C. marina germinated at temperatures from 15 to 30 ℃, optimum temperature of germination was 22.5 ℃. The lower limit and optimum temperatures for germination of C. ovata cysts was higher than for C. antiqua and C. marina. The role of cysts in the population dynamics of C. ovata is discussed.
机译：为了阐明卵形沙门氏菌（Raphidophyceae）开花爆发的机制，我们调查了卵形杯状囊（C. ovata）的囊肿，并成功地从广岛湾的底部沉积物中发现了它们。囊肿的形态大部分为半球形，直径约为。 30μm，高度约为20微米囊肿通常粘附在固体物质上，例如硅藻壳，颜色为黄绿色，并具有一些深褐色的颗粒。囊肿壁光滑，无装饰物。由于囊肿的形态学特征与古生小球藻和小球藻均一致，因此很难区分这三个物种的囊肿。在17.5至30℃的温度下观察到卵形梭菌的孢子萌发，而在15℃或更低的温度下观察不到。发芽囊肿的数量随温度的升高而增加，最适发芽温度为30℃。尽管C. antiqua和C. marina的囊肿在15至30℃的温度下发芽，但最佳发芽温度为22.5℃。卵形C. ovata囊的萌发的下限和最佳温度高于C. antiqua和C. marina。讨论了囊肿在卵形衣原体种群动态中的作用。

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