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首页> 外文OA文献 >Life cycle stages of the benthic palytoxin-producing dinoflagellate Ostreopsis cf. ovata (Dinophyceae)
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Life cycle stages of the benthic palytoxin-producing dinoflagellate Ostreopsis cf. ovata (Dinophyceae)

机译：产底栖植物毒素的鞭毛藻的生命周期阶段cf.卵子（Dinophyceae）

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The asexual and sexual reproduction of Ostreopsis cf. ovata was studied in the field and in cultures isolated\udfrom two locations in the Mediterranean Sea. Asexual division took place in the motile stage by the sharing\udof theca (desmoschisis). High cell-size variability and differences in division capability were detected in the\udcultures. Thecal analyses and nuclear division patterns allowed characterization of the different phases of\uddividing cells obtained during an in situ cell-cycle sampling performed off Llavaneres beach (Northeast\udSpain). During the 45-h cycle, binucleated cells accounted for 2.6% of the population. Division was initiated\udwith the onset of dusk and reached a maximum 3–4 h before dawn. No dividing cells were detected after\ud09:00 AM. Sexuality occurred both in cultures and in natural populations of O. cf. ovata. Mating gamete pairs\udwere the only sexual stages that could be distinguished from vegetative stages. The differences between\udthese pairs and dividing cells are described herein. None of the individually isolated gamete pairs\udunderwent fusion nor encystment, instead, in most of them one member of the gamete pair divided. Rather\udthan plasmogamy, there was evidence of nuclear migration from one gamete to the other. Pellicle cysts,\udthin-walled cysts, and thecate cysts were also identified and studied. These cysts, embedded in abundant\udmucilage in a bloom-derived incubated sample, were able to germinate for as long as 6 months after their\udformation. Our results suggest that they constitute the overwintering population that causes recurrent\udblooms of O. cf. ovata in some areas of the Mediterranean Sea.
机译：骨质疏松症的无性繁殖和有性繁殖。卵子是在田间和与地中海两个地方隔离的文化中进行研究的。无性分裂发生在活动期，是通过卵囊的共享\ udof（去潮）。在培养物中检测到高细胞大小变异性和分裂能力差异。规模分析和核分裂模式可以表征在拉瓦纳雷斯海滩（东北\西班牙）外进行的原位细胞周期采样过程中获得的\ uddividing细胞的不同阶段。在45小时的周期中，双核细胞占人口的2.6％。在黄昏开始时开始分裂，直到黎明前最多3-4小时。在\ ud09：00 AM之后未检测到分裂细胞。性行为在文化和自然种群中均发生。卵形配子对交配是唯一可以与营养期区分开的性期。这些对与分裂细胞之间的差异在本文中描述。没有单独隔离的配子对\未进行融合或封装，而是在大多数情况下，配子对中的一个分裂了。相比于等离子，有证据表明核从一种配子迁移到另一种。还鉴定并研究了囊性囊肿，\ udthin壁囊肿和主题囊肿。这些囊肿包埋在由水华衍生的培养样品中的丰富的胞浆中，能够在其畸变后长达6个月内发芽。我们的结果表明，它们构成了导致O. cf.复发\泛滥的越冬种群。卵形在地中海的某些地区。

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