Bacterial community structure and function change in association with colonizer plants during early primary succession in a glacier forefield

Knelman, Joseph E.; Legg, Teresa M.; O’Neill, Sean; Washenberger, Christopher L.; González, Antonio G.; Cleveland, Cory C.; Nemergut, Diana R.

doi:10.1016/j.soilbio.2011.12.001

Cited by 198 publications

(163 citation statements)

References 72 publications

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“…This interpretation is corroborated by the observations that distance from the terminus is represented by a vector opposite to those representing the other two variables in the redundancy analysis plot (Figure 3). The results from the multivariate analysis therefore suggest that glacier debris cover may host chronosequences similar to those observed in glacier forefields Nicol et al, 2005;Nemergut et al, 2007;Schmidt et al, 2008;Sattin et al, 2009;Schutte et al, 2009Schutte et al, , 2010Philippot et al, 2011;Knelman et al, 2012;Zumsteg et al, 2012).…”

Section: Discussionmentioning

confidence: 63%

“…This is not surprising since the importance of local factors such as climatic conditions, bedrock composition, soil texture and pH in influencing bacterial diversity has been already documented (Mannisto et al, 2007;Lazzaro et al, 2009;Zumsteg et al, 2012). Particularly, the influence of pH was reported in several papers, although with contrasting results (Eskelinen et al, 2009;Lauber et al, 2009;Borin et al, 2010;King et al, 2010;Philippot et al, 2011;Knelman et al, 2012). Despite the fact that the microbial community structure did not show any significant relation with pH, the debris of the Belvedere glacier was on average more acidic than that of the Miage glacier (see Supplementary Information).…”

Section: Discussionmentioning

confidence: 93%

“…Particularly, some works suggested that Cyanobacteria are important sources of C in very early succession stages and some surveys did report high abundances of Cyanobacteria in early colonization stages (Nemergut et al, 2007;Schmidt et al, 2008;Zumsteg et al, 2012). On the contrary, other investigations showed low abundances of Cyanobacteria in glacier forefields without any relation between their abundance and soil age Sattin et al, 2009;Goransson et al, 2011;Knelman et al, 2012). Hence, the role of Cyanobacteria in the very early stages of ecosystem development is currently controversial.…”

Section: Discussionmentioning

confidence: 99%

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Bacterial community structure on two alpine debris-covered glaciers and biogeography of Polaromonas phylotypes

et al. 2013

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High-elevation cold environments are considered ideal places to test hypotheses about mechanisms of bacterial colonization and succession, and about bacterial biogeography. Debris-covered glaciers (glaciers whose ablation area is mainly covered by a continuous layer of rock debris fallen from the surrounding mountains) have never been investigated in this respect so far. We used the Illumina technology to analyse the V5 and V6 hypervariable regions of the bacterial 16S rRNA gene amplified from 38 samples collected in July and September 2009 at different distances from the terminus on two debris-covered glaciers (Miage and Belvedere-Italian Alps). Heterotrophic taxa-dominated communities and bacterial community structure changed according to ice ablation rate, organic carbon content of the debris and distance from the glacier terminus. Bacterial communities therefore change during downwards debris transport, and organic carbon of these recently exposed substrates is probably provided more by allochthonous deposition of organic matter than by primary production by autotrophic organisms. We also investigated whether phylotypes of the genus Polaromonas, which is ubiquitous in cold environments, do present a biogeographical distribution by analysing the sequences retrieved in this study together with others available in the literature. We found that the genetic distance among phylotypes increased with geographic distance; however, more focused analyses using discrete distance classes revealed that both sequences collected at sites o100 km and at sites 9400-13 500 km to each other were more similar than those collected at other distance classes. Evidences of biogeographic distribution of Polaromonas phylotypes were therefore contrasting.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Bacterial community structure on two alpine debris-covered glaciers and biogeography of Polaromonas phylotypes

et al. 2013

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“…Hamelin et al (2002) indicated that certain plants mediate favourable niches for nitrogen-fixing bacteria. Plant-specific differences in the nitrogen-fixing bacterial community may be related to plant species, biomass, the chemical composition of litter and root exudates (Shaffer et al, 2000;Bürgmann et al, 2005;Hsu and Buckley, 2009;Knelman et al, 2012). Soil physicochemical factors, such as pH and water content (Zhan and Sun, 2011), microbial biomass carbon and microbial biomass nitrogen (Hayden et al, 2010), total nitrogen and total potassium (Teng et al, 2009;Hayden et al, 2010), total phosphorus and reactive phosphorus (Reed et al, 2010;Zou et al, 2011;Romero et al, 2012), electrical conductivity (Hayden et al, 2010;Hamilton et al, 2011) and nutrient level (Jasrotia and Ogram, 2008;Zhan and Sun, 2012), have also been identified as drivers of nifH gene diversity and abundance in many environments.…”

Section: S Tai Et Al: High Diversity Of Nitrogen-fixing Bacteriamentioning

confidence: 99%

High diversity of nitrogen-fixing bacteria in the upper reaches of the Heihe River, northwestern China

et al. 2013

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Vegetation plays a key role in water conservation in the southern Qilian Mountains (northwestern China), located in the upper reaches of the Heihe River. Nitrogen-fixing bacteria are crucial for the protection of the nitrogen supply for vegetation in the region. In the present study, nifH gene clone libraries were established to determine differences between the nitrogen-fixing bacterial communities of the Potentilla parvifolia shrubland and the Carex alrofusca meadow in the southern Qilian Mountains. All of the identified nitrogen-fixing bacterial clones belonged to the Proteobacteria. At the genus level, Azospirillum was only detected in the shrubland soil, while Thiocapsa, Derxia, Ectothiorhodospira, Mesorhizobium, Klebsiella, Ensifer, Methylocella and Pseudomonas were only detected in the meadow soil. The phylogenetic tree was divided into five lineages: lineages I, II and III mainly contained nifH sequences obtained from the meadow soils, while lineage IV was mainly composed of nifH sequences obtained from the shrubland soils. The Shannon–Wiener index of the nifH genes ranged from 1.5 to 2.8 and was higher in the meadow soils than in the shrubland soils. Based on these analyses of diversity and phylogeny, the plant species were hypothesised to influence N cycling by enhancing the fitness of certain nitrogen-fixing taxa. The number of nifH gene copies and colony-forming units (CFUs) of the cultured nitrogen-fixing bacteria were lower in the meadow soils than in the shrubland soils, ranging from 0.4 × 10⁷ to 6.9 × 10⁷ copies g⁻¹ soil and 0.97 × 10⁶ to 12.78 × 10⁶ g⁻¹ soil, respectively. Redundancy analysis (RDA) revealed that the diversity and number of the nifH gene copies were primarily correlated with aboveground biomass in the shrubland soil. In the meadow soil, nifH gene diversity was most affected by altitude, while copy number was most impacted by soil-available K. These results suggest that the nitrogen-fixing bacterial communities beneath Potentilla were different from those beneath Carex

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“…A wide range of abiotic and biotic factors can affect the distribution of diazotrophic bacteria with plants and nutrients as the main drivers influencing the activity, diversity and abundance of this microbial group [14,[70][71][72][73]. Our results show that the diazotrophic community in Belize exhibits low metabolic diversity of primarily potential sulfate reducers.…”

Section: Discussionmentioning

confidence: 73%

Phylogenetic Diversity of Diazotrophs along an Experimental Nutrient Gradient in Mangrove Sediments

Romero

Jacobson-Meyers

Fuhrman

et al. 2015

JMSE

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Abstract:The diversity of diazotrophs was studied in the sediment of mangrove forests (Twin Cays, Belize) subjected to a long-term fertilization with nitrogen and phosphorus. Terminal Restriction Fragment Length Polymorphism (TRFLP) and cloning of PCR-amplified nifH genes were combined via in silico analysis to assign clones to TRFLP-nifH phylotypes, as well as to characterize the occurrence of phylotypes in response to environmental conditions. Results indicated that mangrove sediments from Belize harbor a unique diazotrophic community with a low metabolic diversity dominated by sulfate reducers. The variability of potential nitrogen-fixing sulfate reducers was explained by several environmental parameters, primarily by the abundance of dead roots in the sediments, and the concentration of H2S in the pore-waters. This study describes the complexity of microbial communities within the mangrove sediments with specific functional groups varying along environmental gradients.

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Bacterial community structure and function change in association with colonizer plants during early primary succession in a glacier forefield

Cited by 198 publications

References 72 publications

Bacterial community structure on two alpine debris-covered glaciers and biogeography of Polaromonas phylotypes

Bacterial community structure on two alpine debris-covered glaciers and biogeography of Polaromonas phylotypes

High diversity of nitrogen-fixing bacteria in the upper reaches of the Heihe River, northwestern China

Phylogenetic Diversity of Diazotrophs along an Experimental Nutrient Gradient in Mangrove Sediments

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