Niche dimensions of a marine bacterium are identified using invasion studies in coastal seawater
Niche dimensions of a marine bacterium are identified using invasion studies in coastal seawater
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DOI：
10.1038/s41564-020-00851-2
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发表时间：
2021-01
影响因子：
28.3
通讯作者：
Brent Nowinski;M. Moran
中科院分区：
文献类型：
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作者：
Brent Nowinski;M. Moran
生态位理论是解释自然环境中物种分布的基本生态概念。确定任何生物体的生态位规模都具有挑战性，因为许多环境因素都会影响生物体的生存能力。我们利用连续入侵实验，在 14 个日期将一种异养海洋细菌 Ruegeria pomeroyiDSS-3 引入沿海浮游植物水华中。 R的RNA测序分析。 90 分钟后进行了 pomeroyi 评估，以评估其在这个动态生态系统中的生态位尺寸。我们确定了大约 100 种引发转录反应的外部条件，其中包括底物、营养物质、金属和生物相互作用，如拮抗、抗性和辅因子合成。高峰绽放的特点是大多数基质尺寸都处于有利状态，但推断的 R 生长速率较低。 pomeroyiat 这一阶段表明，其生态位因底物可用性以外的因素而缩小，最有可能是与水华甲藻的负面生物相互作用。我们的研究结果表明海洋环境的化学和生物特征可能限制异养细菌的生存位置。
Niche theory is a foundational ecological concept that explains the distribution of species in natural environments. Identifying the dimensions of any organism’s niche is challenging because numerous environmental factors can affect organism viability. We used serial invasion experiments to introduceRuegeria pomeroyiDSS-3, a heterotrophic marine bacterium, into a coastal phytoplankton bloom on 14 dates. RNA-sequencing analysis ofR. pomeroyiwas conducted after 90 min to assess its niche dimensions in this dynamic ecosystem. We identified ~100 external conditions eliciting transcriptional responses, which included substrates, nutrients, metals and biotic interactions such as antagonism, resistance and cofactor synthesis. The peak bloom was characterized by favourable states for most of the substrate dimensions, but low inferred growth rates ofR. pomeroyiat this stage indicated that its niche was narrowed by factors other than substrate availability, most probably negative biotic interactions with the bloom dinoflagellate. Our findings indicate chemical and biological features of the ocean environment that can constrain where heterotrophic bacteria survive.