...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Microbiology >Temporal and Vertical Distributions of Bacterioplankton at the Gray's Reef National Marine Sanctuary
【24h】

Temporal and Vertical Distributions of Bacterioplankton at the Gray's Reef National Marine Sanctuary

机译：格雷礁国家海洋保护区浮游细菌的时间和垂直分布

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Large spatial scales and long-term shifts of bacterial community composition (BCC) in the open ocean can often be reliably predicted based on the dynamics of physical-chemical variables. The power of abiotic factors in shaping BCC on shorter time scales in shallow estuarine mixing zones is less clear. We examined the diurnal variation in BCC at different water depths in the spring and fall of 2011 at a station in the Gray's Reef National Marine Sanctuary (GRNMS). This site is located in the transition zone between the estuarine plume and continental shelf waters of the South Atlantic Bight. A total of 234,516 pyrotag sequences of bacterial 16S rRNA genes were recovered; they were taxonomically affiliated with >200 families of 23 bacterial phyla. Nonmetric multidimensional scaling analysis revealed significant differences in BCC between spring and fall samples, likely due to seasonality in the concentrations of dissolved organic carbon and nitrate plus nitrite. Within each diurnal sampling, BCC differed significantly by depth only in the spring and differed significantly between day and night only in the fall. The former variation largely tracked changes in light availability, while the latter was most correlated with concentrations of polyamines and chlorophyll a . Our results suggest that at the GRNMS, a coastal mixing zone, diurnal variation in BCC is attributable to the mixing of local and imported bacterioplankton rather than to bacterial growth in response to environmental changes. Our results also indicate that, like members of the Roseobacter clade, SAR11 bacteria may play an important role in processing dissolved organic material in coastal oceans.
机译：通常可以基于物理化学变量的动态可靠地预测大洋中细菌群落组成（BCC）的大空间尺度和长期变化。在较短的时间尺度上，浅河口混合区中非生物因子在塑造BCC中的作用尚不清楚。我们在2011年春季和秋季在格雷礁国家海洋保护区（GRNMS）的某个站点检查了BCC在不同水深处的日变化。该地点位于河口羽流和南大西洋海岸线的大陆架水之间的过渡带。总共回收了234,516个细菌16S rRNA基因的热标记序列;它们在分类学上与23个细菌门的200多个科相关。非度量多维标度分析显示，春季和秋季样品之间的BCC有显着差异，这可能是由于溶解的有机碳，硝酸盐和亚硝酸盐浓度的季节性变化所致。在每个昼夜采样中，BCC仅在春季在深度上有显着差异，而在秋季仅白天和黑夜之间有显着差异。前者的变化很大程度上追踪了光的可用性，而后者则与多胺和叶绿素a的浓度最相关。我们的研究结果表明，在沿海混合区GRNMS，BCC的昼夜变化可归因于本地和进口浮游生物的混合，而不是细菌对环境变化的响应。我们的研究结果还表明，SAR11细菌像玫瑰红细菌进化枝成员一样，可能在加工沿海海洋中溶解的有机物质中起重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号