Strain-specific differences in the grazing sensitivities of closely related ultramicrobacteria affiliated with the Polynucleobacter cluster
Strain-specific differences in the grazing sensitivities of closely related ultramicrobacteria affiliated with the Polynucleobacter cluster
复制标题
DOI：
10.1128/aem.70.10.5787-5793.2004
复制
发表时间：
2004-10-01
影响因子：
4.4
通讯作者：
Hahn, MW
中科院分区：
文献类型：
--
作者：
Boenigk, J;Stadler, P;Hahn, MW
超微细菌（细胞体积= 99.6% 16S rRNA基因序列相似性）和3种密切相关的鞭毛虫（100% 18S rRNA基因序列相似性）。与大型细菌相比，多核杆菌对超微细菌的捕食能力较弱，其鞭毛虫的生长速度较慢。特定清除率在捕食者大小单位h（-1）的0.14 × 10(5)至2.8 × 10(5)之间。摄食率与鞭毛虫和细菌菌株密切相关（P < 0.001）。所调查的三种鞭毛虫的放牧死亡率在同一猎物品系上的差异高达近四倍。我们得出结论：(1)隶属于Polynucleobacter集群的超微细菌没有受到放牧的保护；(2)即使在密切相关的细菌之间，放牧敏感性的菌株特异性差异也很高；(3)捕食者-猎物相互作用的菌株特异性差异可能是微生物微多样性进化和维持的重要因素。
Ultramicrobacteria (cell volume = 99.6% 16S rRNA gene sequence similarity) bacteria and three closely related (100% 18S rRNA gene sequence similarity) flagellates were performed. In comparison to larger bacteria, predation on the ultramicrobacterial Polynucleobacter strains was weak, and the growth of the predating flagellates was slow. Specific clearance rates ranged between 0.14 x 10(5) and 2.8 x 10(5) Units of predator size h(-1). Feeding rates strongly depended on the flagellate and bacterial strain (P < 0.001). Grazing mortality rates of the three flagellate strains investigated varied for the same prey strain by up to almost fourfold. We conclude that (i) ultramicrobacteria affiliated with the Polynucleobacter cluster are not protected from grazing, (ii) strain-specific variations in grazing sensitivity even between closely related bacteria are high, and (iii) strain-specific differences in predator-prey interaction could be an important factor in the evolution and maintenance of microbial microdiversity.