The genus Oxyrrhis is a heterotrophic dinoflagellate found in diverse marine environments. Oxyrrhis spp. have received attention owing to their ecological and industrial importance, high lipid contents, and docosahexaenoic acid formation. To the best of our knowledge, contrary to O. marina, ecophysiological characterization studies on O. maritima have not yet been reported. Therefore, we investigated the taxonomy and ecophysiology of four strains of O. marina from coastal waters and two strains of O. maritima from the littoral tidepool waters of Korea. Based on phylogenetic trees constructed using internal transcribed spacer ribosomal DNA (ITS rDNA) and SSU rDNA of dinoflagellates, the clade of all four O. marina strains was divergent from that of the two O. maritima strains. We measured the growth rates of both species at various water temperatures (10–36 °C), salinities (5–90), and light intensities (0–100 µE·m⁻²·s⁻¹). The lowest (O. marina and O. maritima: 10 °C) and highest temperatures (O. marina: <35 °C, O. maritima: >35 °C) revealed that O. maritima has more tolerance to high salinity. This study provides a basis for understanding the ecophysiology of O. marina and O. maritima and their population dynamics in marine ecosystems.

中文翻译：

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朝鲜水域洋蓟和洋蓟的分类学和生理学

Oxyrrhis属是一种在不同海洋环境中发现的异养鞭毛藻。Oxyrrhis属 因其生态和工业重要性、高脂质含量和二十二碳六烯酸的形成而受到关注。据我们所知，与O. marina相反，O . maritima 的生态生理特征研究尚未报道。因此，我们研究了来自沿海水域的 4 株O. marina和 2 株O. maritima的分类学和生态生理学。来自韩国的沿海潮汐池水域。基于使用内部转录间隔核糖体 DNA (ITS rDNA) 和甲藻的 SSU rDNA 构建的系统发育树，所有四个 O. marina菌株的进化枝与两个 O. maritima菌株的进化枝不同。我们测量了两种物种在不同水温 (10–36 °C)、盐度 (5–90) 和光照强度 (0–100 µE·m ^{− 2} ·s ⁻¹ )下的生长速率。最低 ( O. marina和O. maritima : 10 °C) 和最高温度 ( O. marina : <35 °C, O. maritima : >35 °C) 表明O. maritima对高盐度有更高的耐受性。该研究为了解O. marina和O. maritima的生态生理学及其在海洋生态系统中的种群动态提供了基础。