Bacterial enhancement of gel particle coagulation in seawater
Bacterial enhancement of gel particle coagulation in seawater
复制标题
DOI：
10.3354/ame01784
复制
发表时间：
2016-04
影响因子：
1.4
通讯作者：
Yosuke Yamada;H. Fukuda;Yuya Tada;K. Kogure;T. Nagata
中科院分区：
文献类型：
--
作者：
Yosuke Yamada;H. Fukuda;Yuya Tada;K. Kogure;T. Nagata
凝胶状颗粒在海洋环境中无处不在，影响着全球碳循环，但控制海水中凝胶颗粒凝结的机制尚不完全清楚。我们研究了海洋细菌是否增强凝胶颗粒的凝固。将由等效球径 (ESD) 为 0.01 cm 的多糖组成的凝胶颗粒悬浮在旋转管中的海水中，以检查颗粒 ESD 和丰度的时间过程变化。海洋细菌组合在 24 至 96 小时内强烈增强凝胶颗粒凝结成大聚集体（ESD，0.1 至 1 厘米）。催化报告基因沉积荧光原位杂交显示，一组快速生长的细菌属于假交替单胞菌属。使用假交替单胞菌属的实验。分离株表明 11 个分离株中有 6 个增强了凝胶颗粒凝结。这种增强因物种而异。大骨料的沉降速度高达 270 m d -1 。我们的结果表明，细菌可以显着增强凝胶颗粒的凝结和海水中快速沉降的大聚集体的形成。
Gel-like particles are ubiquitous in marine environments, affecting global carbon cycles, but the mechanisms controlling gel particle coagulation in seawater are not entirely clear. We investigated whether marine bacteria enhance the coagulation of gel particles. Gel particles composed of polysaccharides with an equivalent spherical diameter (ESD) of 0.01 cm were sus- pended in seawater contained in rotating tubes to examine time course changes in particle ESD and abundance. Marine bacterial assemblages strongly enhanced the coagulation of gel particles into large aggregates (ESD, 0.1 to 1 cm) over a period of 24 to 96 h. Catalyzed reporter deposition fluorescence in situ hybridization revealed that one group of bacteria that grew rapidly was affil- iated with the genus Pseudoalteromonas. Experiments using Pseudoalteromonas spp. isolates indicated that 6 of 11 isolates enhanced gel particle coagulation. This enhancement differed greatly by species. High settling velocities, up to 270 m d −1 , were determined for the large aggre- gates. Our results demonstrate that bacteria can substantially enhance gel particle coagulation and the formation of fast-settling large aggregates in seawater.