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首页> 外文期刊>Applied Microbiology >Comparison of Growth Rates of Aerobic Anoxygenic Phototrophic Bacteria and Other Bacterioplankton Groups in Coastal Mediterranean Waters
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Comparison of Growth Rates of Aerobic Anoxygenic Phototrophic Bacteria and Other Bacterioplankton Groups in Coastal Mediterranean Waters

机译：地中海沿海水域有氧产氧养分细菌和其他浮游细菌群体的生长速率比较

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Growth is one of the basic attributes of any living organism. Surprisingly, the growth rates of marine bacterioplankton are only poorly known. Current data suggest that marine bacteria grow relatively slowly, having generation times of several days. However, some bacterial groups, such as the aerobic anoxygenic phototrophic (AAP) bacteria, have been shown to grow much faster. Two manipulation experiments, in which grazing, viruses, and resource competition were reduced, were conducted in the coastal Mediterranean Sea (Blanes Bay Microbial Observatory). The growth rates of AAP bacteria and of several important phylogenetic groups (the Bacteroidetes , the alphaproteobacterial groups Roseobacter and SAR11, and the Gammaproteobacteria group and its subgroups the Alteromonadaceae and the NOR5/OM60 clade) were calculated from changes in cell numbers in the manipulation treatments. In addition, we examined the role that top-down (mortality due to grazers and viruses) and bottom-up (resource availability) factors play in determining the growth rates of these groups. Manipulations resulted in an increase of the growth rates of all groups studied, but its extent differed largely among the individual treatments and among the different groups. Interestingly, higher growth rates were found for the AAP bacteria (up to 3.71 day~(?1)) and for the Alteromonadaceae (up to 5.44 day~(?1)), in spite of the fact that these bacterial groups represented only a very low percentage of the total prokaryotic community. In contrast, the SAR11 clade, which was the most abundant group, was the slower grower in all treatments. Our results show that, in general, the least abundant groups exhibited the highest rates, whereas the most abundant groups were those growing more slowly, indicating that some minor groups, such the AAP bacteria, very likely contribute much more to the recycling of organic matter in the ocean than what their abundances alone would predict.
机译：生长是任何生物体的基本属性之一。出人意料的是，海洋浮游植物的生长速度知之甚少。目前的数据表明，海洋细菌的生长速度相对较慢，产生时间为几天。但是，某些细菌类，如需氧生氧光养（AAP）细菌，已显示出生长快得多的特点。在地中海沿岸（布拉内斯湾微生物天文台）进行了两次处理实验，减少了放牧，病毒和资源竞争。根据操作处理中细胞数量的变化，计算出AAP细菌和几个重要的系统发育组（拟杆菌，Rosproteobacterial组Roseobacter和SAR11，以及Gammaproteobacteria组及其亚组Alteromonadaceae和NOR5 / OM60进化枝）的生长速率。 。此外，我们研究了自上而下（由于掠食者和病毒造成的死亡率）和自下而上（资源可用性）因素在确定这些群体的增长率中所起的作用。操纵导致所有研究组的增长率增加，但是其程度在各个治疗方法之间以及不同组之间差异很大。有趣的是，尽管AAP细菌（最多3.71天〜（？1））和链霉菌科（最多5.44天〜（？1））的生长速率更高，尽管这些细菌组仅代表一个细菌。在原核生物总数中所占的比例非常低。相比之下，SAR11进化枝是最丰富的一组，在所有处理中生长速度都较慢。我们的结果表明，一般而言，最不富裕的群体表现出最高的发生率，而最富裕的群体则是生长较慢的群体，这表明一些次要群体，例如AAP细菌，很可能对有机物的回收做出了更多贡献。在海洋中，他们的丰度就无法预测。

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