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首页> 外文期刊>Diatom Research >Diversity, temporal distribution and physiology of the centric diatom Leptocylindrus Cleve (Bacillariophyta) from a southern hemisphere upwelling system
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Diversity, temporal distribution and physiology of the centric diatom Leptocylindrus Cleve (Bacillariophyta) from a southern hemisphere upwelling system

机译：南半球上升流系统的中心硅藻小球藻Cleve（Bacillariophyta）的多样性，时间分布和生理学

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The marine diatom Leptocylindrus is a major component of phytoplankton blooms in coastal ecosystems and upwelling regions worldwide, however, little is known about this genus in the southern hemisphere. Whilst Leptocylindrus danicus has been reported from south-eastern (SE) Australia since the 1930s, there has been neither unequivocal species identification nor focused examination of the temporal abundance of Leptocylindrus in this region. Such investigations are crucial in the context of climate change and the strengthening of the East Australian Current, which is expected to result in alterations to the seasonal abundance and distribution of Leptocylindrus along the east Australian coast. Thus we also describe the temporal distribution of Leptocylindrus based on 50 years of records, revealing that this diatom is a key component of the seasonal phytoplankton cycle, with greatest abundance in the austral spring and summer. Using light and transmission electron microscopy and molecular phylogenetics based on the nuclear-encoded ITS1-5.8S-ITS2 rDNA region, our study unambiguously revealed three species, L. danicus, Leptocylindrus convexus and Leptocylindrus aporus from 34 clonal isolates from SE Australia, with the majority (82%) of strains identified as L. danicus. Furthermore, we investigated the growth, auxospore and resting spore formation of the most commonly occurring species, L. danicus, under four temperature and irradiance scenarios. The diatom reached maximum growth rates (mu Max, 1.71 divisions day(-1)) under relatively high temperatures (25 degrees C) and light conditions (100 mu mol photons m(-2)s(-1)) between days 2 and 7 of the experiment. When temperature and light regimes were reduced (18 degrees C, 50 mu mol photonsm(-2)s(-1)) auxospores and resting spores were formed. The rapid growth rate and potential of L. danicus to form auxospores are important survival mechanisms in coastal upwelling systems and likely to result in the continued success of this species in Eastern Australia. The ecological, physiological and evolutionary response of this significant diatom group to further ocean warming should be the focus of future investigations.
机译：海洋硅藻细齿龙是全世界沿海生态系统和上升流地区浮游植物开花的主要成分，但是，对该属在南半球知之甚少。自1930年代以来，从澳大利亚东南部（SE）报道了扁豆（Leptocylindrus danicus），但该区域既没有明确的物种鉴定，也没有针对性的研究。此类调查对于气候变化和东澳大利亚洋流的加强至关重要，东亚洋流预计将导致东澳大利亚沿岸淡水龙的季节丰度和分布发生变化。因此，我们还基于50年的记录描述了Leptocylindrus的时间分布，揭示了该硅藻是季节性浮游植物周期的关键组成部分，在春季和夏季的南方含量最高。使用光和透射电子显微镜以及基于核编码的ITS1-5.8S-ITS2 rDNA区域的分子系统发育学，我们的研究清楚地揭示了来自澳大利亚SE的34个克隆分离物中的三个种，即丹氏乳杆菌，凸状隐球菌和隐孢子状孢子。大部分（82％）菌株被鉴定为丹氏乳杆菌。此外，我们研究了在四种温度和辐照情况下最常见的棉铃虫（L. danicus）的生长，辅助孢子和静止孢子的形成。硅藻在相对高温（25摄氏度）和光照条件下（100μmol光子m（-2）s（-1））在第2天和第2天之间达到了最大生长速率（mu Max，1.71个分裂日（-1））。实验的7。当降低温度和光照状态（18摄氏度，50μmol光子m（-2）s（-1））时，形成了芽孢和静止芽孢。丹尼斯乳杆菌的快速生长速度和形成辅助孢子的潜力是沿海上升流系统中的重要生存机制，并有可能导致该物种在澳大利亚东部继续获得成功。这一重要的硅藻类群对进一步海洋变暖的生态，生理和进化反应应成为未来研究的重点。

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