Does ecosystem size determine aquatic bacterial richness?

被引:207
作者
Reche, I
Pulido-Villena, E
Morales-Baquero, R
Casamayor, EO [1 ]
机构
[1] CSIC, Ctr Estudios Avanzados Blanes, Unidad Limnol, Blanes 17300, Girona, Spain
[2] Univ Granada, Inst Agua, E-18071 Granada, Spain
[3] Univ Granada, Fac Ciencias, Dept Biol Anim & Ecol, E-18071 Granada, Spain
关键词
bacteria; bacterial community structure; dispersion; diversity; ecosystem size; island biogeography; richness;
D O I
10.1890/04-1587
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
With the advent of DNA-based molecular technologies, microbial ecologists now have the tools to test whether general ecological patterns apply to microorganisms. In this study, we selected 11 high-mountain lakes from Sierra Nevada (Spain) to test the predictions of island-biogeography theory in relation to ecosystem size and isolation, and to assess the influence of other factors (i.e., ecosystem productivity, resource richness, and biotic interactions) on bacterial community structure. Bacterial operational taxonomic units (OTUs), generated by denaturing-gradient gel electrophoresis of polymerase chain-reaction-amplified 16S rRNA genes, were used as a surrogate of predominant "biodiversity units." OTU composition among lakes was heterogeneous, and the number of site-specific OTUs was near 50%. Lake remoteness did not affect the number of bacterial OTUs although the spatial distribution of the lakes significantly influenced bacterial composition. Lakes that were closer together had more similar bacterial fingerprints. We found a consistent positive association between bacterial OTU richness and lake area. The slope of this relationship (0.161 +/- 0.026, including literature data) was similar to slopes obtained for organisms with high dispersion rates.
引用
收藏
页码:1715 / 1722
页数:8
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