A single Prochlorococcus ecotype dominates the tropical Bay of Bengal with ultradian growth

IF 4.3 2区 生物学 Q2 MICROBIOLOGY
Jonathan Grone, Camille Poirier, Kathleen Abbott, Fabian Wittmers, Gualtiero Spiro Jaeger, Amala Mahadevan, Alexandra Z. Worden
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Abstract

The Bay of Bengal (BoB) spans >2.2 million km2 in the northeastern Indian Ocean and is bordered by dense populations that depend upon its resources. Over recent decades, a shift from larger phytoplankton to picoplankton has been reported, yet the abundance, activity, and composition of primary producer communities are not well-characterized. We analysed the BoB regions during the summer monsoon. Prochlorococcus ranged up to 3.14 × 105 cells mL−1 in the surface mixed layer, averaging 1.74 ± 0.46 × 105 in the upper 10 m and consistently higher than Synechococcus and eukaryotic phytoplankton. V1-V2 rRNA gene amplicon analyses showed the High Light II (HLII) ecotype formed 98 ± 1% of Prochlorococcus amplicons in surface waters, comprising six oligotypes, with the dominant oligotype accounting for 65 ± 4% of HLII. Diel sampling of a coherent water mass demonstrated evening onset of cell division and rapid Prochlorococcus growth between 1.5 and 3.1 div day−1, based on cell cycle analysis, as confirmed by abundance-based estimates of 2.1 div day−1. Accumulation of Prochlorococcus produced by ultradian growth was restricted by high loss rates. Alongside prior Arabian Sea and tropical Atlantic rates, our results indicate Prochlorococcus growth rates should be reevaluated with greater attention to latitudinal zones and influences on contributions to global primary production.

Abstract Image

Abstract Image

一种单一的 Prochlorococcus 生态型主导着热带孟加拉湾的超昼夜生长
孟加拉湾(BoB)位于印度洋东北部,面积达 220 万平方公里,周边人口稠密,依赖孟加拉湾的资源。据报道,近几十年来,浮游植物从大型浮游植物向微浮游植物转变,但初级生产者群落的丰度、活动和组成却没有得到很好的描述。我们分析了夏季季风期间的 BoB 地区。表层混合层中的原绿球藻细胞数量高达 3.14 × 105 cells mL-1,上层 10 米处的平均数量为 1.74 ± 0.46 × 105,始终高于中生球藻和真核浮游植物。V1-V2 rRNA 基因扩增子分析表明,高光 II(HLII)生态型占表层水域原绿球藻扩增子的 98 ± 1%,包括 6 个寡聚型,其中优势寡聚型占 HLII 的 65 ± 4%。根据细胞周期分析,在 1.5 至 3.1 div 天-1 之间,相邻水体的昼夜取样显示了细胞分裂的傍晚开始和原绿球藻的快速生长,基于丰度的估计值 2.1 div 天-1 也证实了这一点。超昼夜生长产生的原绿球藻的积累受到高损失率的限制。我们的研究结果表明,除了先前的阿拉伯海和热带大西洋生长率外,还应该重新评估原绿球藻的生长率,更多地关注纬度区和对全球初级生产的影响。
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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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