Evolving Concepts of Bacterial Species

被引:26
作者
Barraclough, Timothy G. [1 ]
Balbi, Kevin J. [1 ]
Ellis, Richard J. [2 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Life Sci, Ascot SL5 7PY, Berks, England
[2] AHVLA Weybridge, Anim Hlth & Vet Labs Agcy, Addlestone KT15 3NB, Surrey, England
基金
英国生物技术与生命科学研究理事会;
关键词
Bacteria; Prokaryotes; Species; Speciation; Diversification; Recombination; Divergent selection; Horizontal gene transfer; Lateral gene transfer; Multi-locus sequence types; Genomes; Niches; GENE-TRANSFER; COMPARATIVE GENOMICS; SEQUENCE DIVERGENCE; SEXUAL ISOLATION; DIVERSITY; RECOMBINATION; ADAPTATION; TRANSFORMATION; SPECIATION; ECOLOGY;
D O I
10.1007/s11692-012-9181-8
中图分类号
Q [生物科学];
学科分类号
090105 [作物生产系统与生态工程];
摘要
The same evolutionary forces that cause diversification in sexual eukaryotes are expected to cause diversification in bacteria. However, in bacteria, the wider variety of mechanisms for gene exchange (or lack thereof) increases the range of expected diversity patterns compared to those of sexual organisms. Two parallel concepts for bacterial speciation have developed, based on ecological divergence or barriers to recombination in turn. Recent evidence from DNA sequence data shows that both processes can generate independently evolving groups that are equivalent to sexual species and that represent separate arenas within which recombination (when it occurs), selection and drift occur. It remains unclear, however, how often different processes act in concert to generate simple units of diversity, or whether a more complex model of diversity is required, specifying hierarchical levels at which different cohesive processes operate. We advocate an integrative approach that evaluates the effects of multiple evolutionary forces on diversity patterns. There is also great potential for laboratory studies of bacterial evolution that test evolutionary mechanisms inferred from population genetic analyses of multi-locus and genome sequence data.
引用
收藏
页码:148 / 157
页数:10
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