Temporal changes of major bacterial groups and bacterial heterotrophic activity during a Phaeocystis globosa bloom in the eastern English Channel
Temporal changes of major bacterial groups and bacterial heterotrophic activity during a Phaeocystis globosa bloom in the eastern English Channel
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DOI：
10.3354/ame01359
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发表时间：
2009-01-01
影响因子：
1.4
通讯作者：
Christaki, U.
中科院分区：
文献类型：
--
作者：
Lamy, D.;Obernosterer, I.;Christaki, U.
主要细菌群和散装异养活性的时间变化进行了测定，在生长，衰老和后开花阶段的球形棕囊藻水华，在沿海网站在东部英吉利海峡。细胞特异性胞外酶活性在球形棕囊藻生长期间最高，而细菌丰度和细菌异养产量在球形棕囊藻水华衰老期间达到峰值。拟杆菌和γ-变形菌是球形假单胞菌生长过程中最重要的细菌类群，占菌体丰度和亮氨酸掺入量的13%~ 47%。在浮游植物生长期结束时，γ-变形菌是细菌异养生产的最重要的贡献者，占散装亮氨酸掺入的68%。在衰老阶段，36%和29%的散装亮氨酸掺入归因于拟杆菌和Alphaproteobacteria分别。最后，消失后的绽放，伽马和Alphaproteobacteria占主导地位的玫瑰花分支负责散装亮氨酸掺入的33%和43%，分别。在大部分研究期间，细菌群的相对丰度在连续日期之间几乎没有变化。不同的细菌群体的散装丰度和亮氨酸掺入的贡献与外切蛋白水解和葡萄糖苷活性和颗粒有机碳，这表明至少有一些特异性，这些细菌群体在环境中的代谢特性。
The temporal changes in major bacterial groups and bulk heterotrophic activity were determined during the growth, senescence and post-bloom phases of a Phaeocystis globosa bloom, at a coastal site in the eastern English Channel. Cell-specific exoenzymatic activities were highest during the growth period of P. globosa, while bacterial abundance and bacterial heterotrophic production peaked during the senescence of the P. globosa bloom. Bacteroidetes and Gammaproteobacteria were the most important bacterial groups during the growth period of P. globosa, contributing between 13 and 47% of bulk bacterial abundance and leucine incorporation. At the end of the phytoplankton growth period, Gammaproteobacteria were the most important contributors to bacterial heterotrophic production, accounting for 68% of bulk leucine incorporation. During the senescent phase, 36 and 29% of bulk leucine incorporation were attributable to Bacteroidetes and Alphaproteobacteria, respectively. Finally, after the disappearance of the bloom, Gamma- and Alphaproteobacteria dominated by the Roseobacter clade were responsible for 33 and 43% of bulk leucine incorporation, respectively. The relative abundance of the bacterial groups showed little variability between consecutive dates during most of the study period. The contributions of different bacterial groups to bulk abundance and leucine incorporation were correlated with exo-proteolytic and -glucosidic activities and with particulate organic carbon, suggesting at least some specificity of these bacterial groups with respect to their metabolic properties in the environment.