Subseafloor microbial communities associated with rapid turbidite deposition in the Gulf of Mexico continental slope (IODP Expedition 308)
Subseafloor microbial communities associated with rapid turbidite deposition in the Gulf of Mexico continental slope (IODP Expedition 308)
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DOI：
10.1111/j.1574-6941.2009.00718.x
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发表时间：
2009-09-01
影响因子：
4.2
通讯作者：
Takai, Ken
中科院分区：
文献类型：
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作者：
Nunoura, Takuro;Soffientino, Bruno;Takai, Ken
通过针对小亚单位(SSU)rRNA基因、DSRA和MCRA的依赖于PCR的分子分析和氢酶活性测定，研究了墨西哥湾陆坡布拉索斯-三一盆地IV(BT盆地)和玛尔斯-乌尔萨盆地(乌尔萨盆地)(IODP孔U1319A、U1320A、U1322B和U1324B)浊积岩沉积盆地中的海底微生物群落。两个盆地的生物量都很低，最大细胞数或SSU rRNA基因拷贝数分别为1×10(-7)个细胞(-1)或g(-1)个。当所有数据集合并时，氢酶活性与通过SSU rRNA基因拷贝数估计的生物量相关。在BT盆地的盆地填充物和基底沉积物中发现了SSU rRNA基因群落结构和SSU rRNA基因拷贝数的差异。在地球化学和地球物理参数以及沉积物沉积环境的背景下对微生物群落和氢酶活性的研究表明，BT盆地盆地充填物和基底沉积物中微生物群落组成的差异与与海平面变化有关的沉积制度有关。这也可能解释了乌尔萨盆地沉积物和BT盆地基底沉积物中相对相似的古生物群落分布。
The subseafloor microbial communities in the turbidite depositional basins Brazos-Trinity Basin IV (BT Basin) and the Mars-Ursa Basin (Ursa Basin) on the Gulf of Mexico continental slope (IODP holes U1319A, U1320A, U1322B and U1324B) were investigated by PCR-dependent molecular analyses targeted to the small subunit (SSU) rRNA genes, dsrA and mcrA, and hydrogenase activity measurements. Biomass at both basins was very low, with the maximum cell or the SSU rRNA gene copy number < 1 x 10(7) cells mL(-1) or copies g(-1) sediments, respectively. Hydrogenase activity correlated with biomass estimated by SSU rRNA gene copy number when all data sets were combined. We detected differences in the SSU rRNA gene community structures and SSU rRNA gene copy numbers between the basin-fill and basement sediments in the BT Basin. Examination of microbial communities and hydrogenase activity in the context of geochemical and geophysical parameters and sediment depositional environments revealed that differences in microbial community composition between the basin-fill and basement sediments in the BT Basin were associated with sedimentation regimes tied to the sea-level change. This may also explain the distributions of relatively similar archaeal communities in the Ursa Basin sediments and basement sediments in the BT Basin.