Local versus global diversity of microorganisms: cryptic diversity of ciliated protozoa
Local versus global diversity of microorganisms: cryptic diversity of ciliated protozoa
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DOI：
10.2307/3546589
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发表时间：
1997-11-01
期刊：
影响因子：
3.4
通讯作者：
Finlay, BJ
中科院分区：
文献类型：
--
作者：
Fenchel, T;Esteban, GF;Finlay, BJ
全球和地方的微生物物种多样性仍然知之甚少。本研究从一个小湖和一个海洋浅水海湾采集的约1厘米（2）厚的沉积物中显微镜下记录了所有种类的纤毛虫原生动物。然后在各种培养条件下培养额外的相邻沉积物样品（共同代表< 50 cm（2）），以揭示“隐藏物种”，这些物种以休眠包囊的形式存在，或者太罕见而无法在显微镜下发现。从湖沼和海洋沉积物中观察到的物种总数的85%和57%，分别是这样的隐种。在这两种情况下，在< 50 cm（2）的沉积物中发现的物种数量约占这两个先前研究充分的栖息地记录的所有纤毛虫物种的75%，约占所有命名的自由生活纤毛虫的8%。这些观察结果支持了微生物“无处不在”的假设，并且它们的全球物种多样性相对有限。
Microbial species diversity both global and local, is still poorly understood. III this study all species of ciliated protozoa were recorded microscopically from similar to 1 cm(2) sediment collected from a small lake and item a marine shallow-water bay. Additional adjacent sediment samples (together representing < 50 cm(2)) were then incubated under a variety of culture conditions to reveal ''cryptic species'' that are present as resting cysts or are too rare to be found microscopically. About 85 and 57% of the total number of observed species from the limnic and marine sediment, respectively, were such cryptic species. In both cases the number of species found in < 50 cm(2) of sediment represented about 75% of all ciliate species ever recorded from these two previously well-studied habitats, and about 8% of all named free-living ciliates. These observations support the assumption thar in the case of microorganisms ''everything is everywhere'' and that their global species diversity is relatively limited.