Summer surface waters in the Gulf of California: Prime habitat for biological N2 fixation
Summer surface waters in the Gulf of California: Prime habitat for biological N2 fixation
复制标题
加利福尼亚湾夏季地表水域：生物固氮的主要栖息地
DOI：
10.1029/2006gb002779
复制
发表时间：
2007
影响因子：
5.2
通讯作者：
B. Popp
中科院分区：
文献类型：
--
作者：
Angelicque E. White;F. Prahl;Ricardo M Letelier;B. Popp
我们报告显着的二氮（N2）固定率在中央盆地的加州湾（GC）在2005年7月至8月。基于表面混合层颗粒物δ 15 N值的混合模型估计表明，N2固定提供了瓜伊马斯和卡门盆地中部浮游植物氮需求的35%至48%。显微镜分析确定了负责的属作为N2固定内共生体，胞内Richelia intracellularis，与较小的贡献，从大型nonheterocystous固氮Trichodesmium。遥感叶绿素a和海面温度的分析表明，初级生产水平在GC的海洋条件是理想的，在夏季为固氮生物的生长区域升高。这些研究结果表明，生物固氮必须考虑到评估过去和现在的氮动态在这个环境重要的地区。
We report significant rates of dinitrogen (N2) fixation in the central basins of the Gulf of California (GC) during July–August 2005. Mixing model estimates based upon δ15N values of particulate matter in the surface mixed layer indicate that N2 fixation provides as much as 35% to 48% of the phytoplankton‐based nitrogen demand in the central Guaymas and Carmen basins. Microscopic analyses identify the responsible genera as the N2‐fixing endosymbiont, Richelia intracellularis, with lesser contributions from the large nonheterocystous diazotroph Trichodesmium. Analyses of remotely sensed chlorophyll a and sea surface temperature indicate that primary production levels are elevated in regions of the GC where oceanographic conditions are ideal in summertime for the growth of N2‐fixing organisms. These findings suggest that biological N2 fixation must be taken into account when assessing past and present nitrogen dynamics in this environmentally important region.