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Biogeochemistry and hydrography shape microbial community assembly and activity in the eastern tropical North Pacific Ocean oxygen minimum zone
Environmental Microbiology ( IF 5.1 ) Pub Date : 2020-08-31 , DOI: 10.1111/1462-2920.15215 J Michael Beman 1 , Sonia Marie Vargas 1 , Samantha Vazquez 1 , Jesse Mac Wilson 1, 2 , Angela Yu 1 , Ariadna Cairo 1 , Elisabet Perez-Coronel 1
Environmental Microbiology ( IF 5.1 ) Pub Date : 2020-08-31 , DOI: 10.1111/1462-2920.15215 J Michael Beman 1 , Sonia Marie Vargas 1 , Samantha Vazquez 1 , Jesse Mac Wilson 1, 2 , Angela Yu 1 , Ariadna Cairo 1 , Elisabet Perez-Coronel 1
Affiliation
Oceanic oxygen minimum zones (OMZs) play a pivotal role in biogeochemical cycles due to extensive microbial activity. How OMZ microbial communities assemble and respond to environmental variation is therefore essential to understanding OMZ functioning and ocean biogeochemistry. Sampling along depth profiles at five stations in the eastern tropical North Pacific Ocean (ETNP), we captured systematic variations in dissolved oxygen (DO) and associated variables (nitrite, chlorophyll, and ammonium) with depth and between stations. We quantitatively analysed relationships between oceanographic gradients and microbial community assembly and activity based on paired 16S rDNA and 16S rRNA sequencing. Overall microbial community composition and diversity were strongly related to regional variations in density, DO, and other variables (regression and redundancy analysis r2 = 0.68–0.82), displaying predictable patterns with depth and between stations. Although similar factors influenced the active community, diversity was substantially lower within the OMZ. We also identified multiple active microbiological networks that tracked specific gradients or features – particularly subsurface ammonium and nitrite maxima. Our findings indicate that overall microbial community assembly is consistently shaped by hydrography and biogeochemistry, while active segments of the community form discrete networks inhabiting distinct portions of the water column, and that both are tightly tuned to environmental conditions in the ETNP.
中文翻译:
生物地球化学和水文学塑造了热带北太平洋东部最低氧区微生物群落的组装和活动
由于广泛的微生物活动,海洋最低氧区(OMZ)在生物地球化学循环中起着关键作用。因此,OMZ 微生物群落如何组装和响应环境变化对于了解 OMZ 功能和海洋生物地球化学至关重要。在热带北太平洋东部 (ETNP) 的五个站点沿深度剖面采样,我们捕获了溶解氧 (DO) 和相关变量(亚硝酸盐、叶绿素和铵)随深度和站点之间的系统变化。我们基于配对的 16S rDNA 和 16S rRNA 测序定量分析了海洋梯度与微生物群落组装和活动之间的关系。总体微生物群落组成和多样性与密度、DO、r 2 = 0.68–0.82),显示具有深度和站点之间的可预测模式。尽管类似的因素影响了活跃的社区,但 OMZ 内的多样性要低得多。我们还确定了多个追踪特定梯度或特征的活跃微生物网络——特别是地下铵和亚硝酸盐最大值。我们的研究结果表明,整体微生物群落组装始终受到水文和生物地球化学的影响,而群落的活跃部分形成了居住在水柱不同部分的离散网络,并且两者都与 ETNP 中的环境条件密切相关。
更新日期:2020-08-31
中文翻译:
生物地球化学和水文学塑造了热带北太平洋东部最低氧区微生物群落的组装和活动
由于广泛的微生物活动,海洋最低氧区(OMZ)在生物地球化学循环中起着关键作用。因此,OMZ 微生物群落如何组装和响应环境变化对于了解 OMZ 功能和海洋生物地球化学至关重要。在热带北太平洋东部 (ETNP) 的五个站点沿深度剖面采样,我们捕获了溶解氧 (DO) 和相关变量(亚硝酸盐、叶绿素和铵)随深度和站点之间的系统变化。我们基于配对的 16S rDNA 和 16S rRNA 测序定量分析了海洋梯度与微生物群落组装和活动之间的关系。总体微生物群落组成和多样性与密度、DO、r 2 = 0.68–0.82),显示具有深度和站点之间的可预测模式。尽管类似的因素影响了活跃的社区,但 OMZ 内的多样性要低得多。我们还确定了多个追踪特定梯度或特征的活跃微生物网络——特别是地下铵和亚硝酸盐最大值。我们的研究结果表明,整体微生物群落组装始终受到水文和生物地球化学的影响,而群落的活跃部分形成了居住在水柱不同部分的离散网络,并且两者都与 ETNP 中的环境条件密切相关。