期刊
FEMS MICROBIOLOGY ECOLOGY
卷 90, 期 1, 页码 54-67出版社
OXFORD UNIV PRESS
DOI: 10.1111/1574-6941.12373
关键词
bacteria; taxonomic diversity; functional diversity; ecological niche; Gram-positive; Gram-negative
类别
资金
- CONSOLIDER INGENIO MONTES [CSD2008-00040]
- SECASOL [CGL2009-08101]
- SECADIN [CGL2012-32965]
- DRIM [CGL2010-16373]
- GLO-VOCS [CGL2010-17172]
- SGR [247, 458]
- Junta de Andalucia government Proyecto de Excelencia [P08-CVI-03549]
- ERC [SyG-2013-610028, CM S2009 AMB 1783]
- predoctoral fellowship (FPU) from the Spanish Ministry of Education
We investigated the relationship between taxonomy and functioning of soil bacterial communities in soils from a Mediterranean holm oak forest using a high-throughput DNA pyrosequencing technique. We used nonparametric tests (Mann-Whitney U-test) to evaluate the sensitivity of each single bacterial genus within the community to the fluctuations of plant physiological and environmental abiotic variables, as well as to fluctuations in soil microbial respiration. Within-lineage (phylum/class) functional similarities were evaluated by the distribution of the Mann-Whitney U-test standardized coefficients (z) obtained for all genera within a given lineage. We further defined different ecological niches and within-lineage degree of functional diversification based on multivariate analyses (principal component analyses, PCA). Our results indicate that strong within-lineage functional diversification causes extensive functional overlapping between lineages, which hinders the translation of taxonomic diversity into a meaningful functional classification of bacteria. Our results further suggest a widespread colonization of possible ecological niches as taxonomic diversity increases. While no strong functional differentiation could be drawn from the analyses at the phylum/class level, our results suggest a strong ecological niche differentiation of bacteria based mainly on the distinct response of Gram-positive and Gram-negative bacteria to fluctuations in soil moisture.
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