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Distinct soil bacterial communities along a small-scale elevational gradient in alpine tundra.

Shen C, Ni Y, Liang W, Wang J, Chu H - Front Microbiol (2015)

Bottom Line: Bacterial communities were more phylogenetically clustered than expected by chance at all elevations based on the standardized effect size of MNTD metric.Taken together, this is the first time that a significant bacterial diversity pattern has been observed across a small-scale elevational gradient.Our results indicated that soil carbon and nitrogen contents were the critical environmental factors affecting bacterial elevational distribution in Changbai Mountain tundra.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing China ; University of Chinese Academy of Sciences, Beijing China.

ABSTRACT
The elevational diversity pattern for microorganisms has received great attention recently but is still understudied, and phylogenetic relatedness is rarely studied for microbial elevational distributions. Using a bar-coded pyrosequencing technique, we examined the biodiversity patterns for soil bacterial communities of tundra ecosystem along 2000-2500 m elevations on Changbai Mountain in China. Bacterial taxonomic richness displayed a linear decreasing trend with increasing elevation. Phylogenetic diversity and mean nearest taxon distance (MNTD) exhibited a unimodal pattern with elevation. Bacterial communities were more phylogenetically clustered than expected by chance at all elevations based on the standardized effect size of MNTD metric. The bacterial communities differed dramatically among elevations, and the community composition was significantly correlated with soil total carbon (TC), total nitrogen, C:N ratio, and dissolved organic carbon. Multiple ordinary least squares regression analysis showed that the observed biodiversity patterns strongly correlated with soil TC and C:N ratio. Taken together, this is the first time that a significant bacterial diversity pattern has been observed across a small-scale elevational gradient. Our results indicated that soil carbon and nitrogen contents were the critical environmental factors affecting bacterial elevational distribution in Changbai Mountain tundra. This suggested that ecological niche-based environmental filtering processes related to soil carbon and nitrogen contents could play a dominant role in structuring bacterial communities along the elevational gradient.

No MeSH data available.


Related in: MedlinePlus

Pearson correlation resulting from Mantel correlogram between the pairwise matrix of OTU niche distances and phylogenetic distances (with Jukes–Cantor model) for each sample group with 999 permutations (A). Significant correlations (P < 0.05, solid circles) indicate phylogenetic signal in species ecological niches (A). Variation in community phylogenetic relatedness along the elevation gradient as measured with observed mean nearest taxon distance (MNTD; B) and the standardized effect sizes of MNTD (C). MNTD followed a unimodal pattern with elevation (r2 = 0.53, P < 0.001). Significant ses.MNTD values were indicated as solid circles (P < 0.001, 1000  model runs).
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Figure 5: Pearson correlation resulting from Mantel correlogram between the pairwise matrix of OTU niche distances and phylogenetic distances (with Jukes–Cantor model) for each sample group with 999 permutations (A). Significant correlations (P < 0.05, solid circles) indicate phylogenetic signal in species ecological niches (A). Variation in community phylogenetic relatedness along the elevation gradient as measured with observed mean nearest taxon distance (MNTD; B) and the standardized effect sizes of MNTD (C). MNTD followed a unimodal pattern with elevation (r2 = 0.53, P < 0.001). Significant ses.MNTD values were indicated as solid circles (P < 0.001, 1000 model runs).

Mentions: Mantel correlograms showed significant positive correlations across short phylogenetic distances. Meanwhile, there were significant negative correlations at intermediate phylogenetic distances and non-significant relationships across longer phylogenetic distances (Figure 5A). These results indicate that at short phylogenetic distances closely related bacterial taxa are phylogenetically conserved in their niches.


Distinct soil bacterial communities along a small-scale elevational gradient in alpine tundra.

Shen C, Ni Y, Liang W, Wang J, Chu H - Front Microbiol (2015)

Pearson correlation resulting from Mantel correlogram between the pairwise matrix of OTU niche distances and phylogenetic distances (with Jukes–Cantor model) for each sample group with 999 permutations (A). Significant correlations (P < 0.05, solid circles) indicate phylogenetic signal in species ecological niches (A). Variation in community phylogenetic relatedness along the elevation gradient as measured with observed mean nearest taxon distance (MNTD; B) and the standardized effect sizes of MNTD (C). MNTD followed a unimodal pattern with elevation (r2 = 0.53, P < 0.001). Significant ses.MNTD values were indicated as solid circles (P < 0.001, 1000  model runs).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493907&req=5

Figure 5: Pearson correlation resulting from Mantel correlogram between the pairwise matrix of OTU niche distances and phylogenetic distances (with Jukes–Cantor model) for each sample group with 999 permutations (A). Significant correlations (P < 0.05, solid circles) indicate phylogenetic signal in species ecological niches (A). Variation in community phylogenetic relatedness along the elevation gradient as measured with observed mean nearest taxon distance (MNTD; B) and the standardized effect sizes of MNTD (C). MNTD followed a unimodal pattern with elevation (r2 = 0.53, P < 0.001). Significant ses.MNTD values were indicated as solid circles (P < 0.001, 1000 model runs).
Mentions: Mantel correlograms showed significant positive correlations across short phylogenetic distances. Meanwhile, there were significant negative correlations at intermediate phylogenetic distances and non-significant relationships across longer phylogenetic distances (Figure 5A). These results indicate that at short phylogenetic distances closely related bacterial taxa are phylogenetically conserved in their niches.

Bottom Line: Bacterial communities were more phylogenetically clustered than expected by chance at all elevations based on the standardized effect size of MNTD metric.Taken together, this is the first time that a significant bacterial diversity pattern has been observed across a small-scale elevational gradient.Our results indicated that soil carbon and nitrogen contents were the critical environmental factors affecting bacterial elevational distribution in Changbai Mountain tundra.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing China ; University of Chinese Academy of Sciences, Beijing China.

ABSTRACT
The elevational diversity pattern for microorganisms has received great attention recently but is still understudied, and phylogenetic relatedness is rarely studied for microbial elevational distributions. Using a bar-coded pyrosequencing technique, we examined the biodiversity patterns for soil bacterial communities of tundra ecosystem along 2000-2500 m elevations on Changbai Mountain in China. Bacterial taxonomic richness displayed a linear decreasing trend with increasing elevation. Phylogenetic diversity and mean nearest taxon distance (MNTD) exhibited a unimodal pattern with elevation. Bacterial communities were more phylogenetically clustered than expected by chance at all elevations based on the standardized effect size of MNTD metric. The bacterial communities differed dramatically among elevations, and the community composition was significantly correlated with soil total carbon (TC), total nitrogen, C:N ratio, and dissolved organic carbon. Multiple ordinary least squares regression analysis showed that the observed biodiversity patterns strongly correlated with soil TC and C:N ratio. Taken together, this is the first time that a significant bacterial diversity pattern has been observed across a small-scale elevational gradient. Our results indicated that soil carbon and nitrogen contents were the critical environmental factors affecting bacterial elevational distribution in Changbai Mountain tundra. This suggested that ecological niche-based environmental filtering processes related to soil carbon and nitrogen contents could play a dominant role in structuring bacterial communities along the elevational gradient.

No MeSH data available.


Related in: MedlinePlus