Processes in Microbial Ecology

Kirchman, David L.

doi:10.1093/acprof:oso/9780199586936.001.0001

Cited by 54 publications

(36 citation statements)

References 604 publications

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“…For example, typical soil fungal growth rates appear to be about 10-fold lower than those of soil bacteria, and fungi tend to be more tolerant of low temperatures and dry soils (13,14). From a simplified perspective, fungi are considered to be dominant degraders of refractory organic matter and mediators of slower carbon cycling, whereas bacteria are typically considered more important regulators of the fast carbon cycling pathways in soil (15).…”

mentioning

confidence: 99%

Soil Bacterial and Fungal Communities Show Distinct Recovery Patterns during Forest Ecosystem Restoration

Sun

Song

Avera

et al. 2017

Appl Environ Microbiol

216

109

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Bacteria and fungi are important mediators of biogeochemical processes and play essential roles in the establishment of plant communities, which makes knowledge about their recovery after extreme disturbances valuable for understanding ecosystem development. However, broad ecological differences between bacterial and fungal organisms, such as growth rates, stress tolerance, and substrate utilization, suggest they could follow distinct trajectories and show contrasting dynamics during recovery. In this study, we analyzed both the intra-annual variability and decade-scale recovery of bacterial and fungal communities in a chronosequence of reclaimed mined soils using next-generation sequencing to quantify their abundance, richness, ␤-diversity, taxonomic composition, and cooccurrence network properties. Bacterial communities shifted gradually, with overlapping ␤-diversity patterns across chronosequence ages, while shifts in fungal communities were more distinct among different ages. In addition, the magnitude of intra-annual variability in bacterial ␤-diversity was comparable to the changes across decades of chronosequence age, while fungal communities changed minimally across months. Finally, the complexity of bacterial cooccurrence networks increased with chronosequence age, while fungal networks did not show clear age-related trends. We hypothesize that these contrasting dynamics of bacteria and fungi in the chronosequence result from (i) higher growth rates for bacteria, leading to higher intra-annual variability; (ii) higher tolerance to environmental changes for fungi; and (iii) stronger influence of vegetation on fungal communities. IMPORTANCE Both bacteria and fungi play essential roles in ecosystem functions, and information about their recovery after extreme disturbances is important for understanding whole-ecosystem development. Given their many differences in phenotype, phylogeny, and life history, a comparison of different bacterial and fungal recovery patterns improves the understanding of how different components of the soil microbiota respond to ecosystem recovery. In this study, we highlight key differences between soil bacteria and fungi during the restoration of reclaimed mine soils in the form of long-term diversity patterns, intra-annual variability, and potential interaction networks. Cooccurrence networks revealed increasingly complex bacterial community interactions during recovery, in contrast to much simpler and more isolated fungal network patterns. This study compares bacterial and fungal cooccurrence networks and reveals cooccurrences persisting through successional ages.KEYWORDS bacteria, chronosequence, cooccurrence networks, disturbance, fungi, reclaimed mine soils, soil microbiota E cologists have been studying the succession dynamics of plant communities for more than a century (1, 2), and the patterns of changes in plant community composition are used as indicators for the restoration of ecosystems (3-5). However,

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mentioning

confidence: 99%

Soil Bacterial and Fungal Communities Show Distinct Recovery Patterns during Forest Ecosystem Restoration

Sun

Song

Avera

et al. 2017

Appl Environ Microbiol

216

109

View full text Add to dashboard Cite

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“…Asimismo, los metales pesados pueden ser inmovilizados mediante la secreción de glicoproteínas o ser adsorbidos en las paredes celulares fúngicas, reduciendo así su efecto tóxico para las plantas (Kirchman 2012). En la siguiente sección se describen brevemente los mecanismos mencionados.…”

Section: Rizobacterias Promotoras De Crecimiento Vegetal Y Su Papel Eunclassified

“…Los sideróforos se pueden agrupar de acuerdo con sus características de unión con el Fe +3 en tres clases: hidroxamatos, catecolatos y alfahidroxicarboxilatos (Kirchman 2012).…”

Section: Sideróforosunclassified

Contaminación Ambiental Por Metales Pesados en México: Problemática Y Estrategias De Fitorremediación

Covarrubias

Cabriales

2017

Rev. Int. Contam. Ambie.

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Palabras clave: remediación, microorganismos, suelos RESUMEN La contaminación por metales pesados en México es un problema que va en aumento debido a la actividad antrópica, específicamente la minería. Los metales contaminantes más importantes en México, dada su toxicidad y abundancia son: mercurio, arsénico, plomo y cromo. Entre los sitios más afectados por las altas concentraciones de metales pesados en suelos se encuentran los estados de Zacatecas, Querétaro, Hidalgo y San Luis Potosí. Una alternativa para contribuir a la solución de este problema, es el uso de especies vegetales para la remoción de metales pesados del suelo o "fitorremediación". Al respecto, en México se han caracterizado especies con capacidad de acumulación de metales, como Scirpus americanus, Typha latifolia, Jatropha dioica, Eichhornia crassipes y Amaranthus hybridus. Una estrategia para mejorar el proceso de fitoextracción de metales es a través de la inoculación de microorganismos del suelo. Bacterias de los géneros Rhizobium, Agrobacterium, Arthrobacter, Microbacterium, Curtobacterium, Rhodococcus, Xanthomonas y Pseudomonas, han mostrado resultados promisorios al ser empleados en estos tratamientos, así como el uso de hongos micorrízicos arbusculares específicamente del género Glomus. Sin embargo, son necesarios más estudios para optimizar los sistemas de tratamiento basados en la selección de las mejores plantas y bacterias endémicas de los sitios contaminados.Key words: remediation, microorganisms, soils ABSTRACT Heavy metal pollution is a growing problem due to anthropic activities such as mining. The most hazardous metals in Mexico are mercury, arsenic, lead, and chromium. States like Zacatecas, Querétaro, Hidalgo, and San Luis Potosi have been affected by the pollution of soils with heavy metals. In this sense, phytoremediation has emerged as an alternative to solve this problem. In Mexico, plant species with metal accumulative capacity have been identified. These include Scirpus americanus, Typha latifolia, Jatropha dioica, Eichhornia crassipes and Amaranthus hybridus. Metal phytoextraction could be improved by coupling bioaugmentation of soil microorganism. Bacteria from the genus Rhizobium, Agrobacterium, Arthrobacter, Microbacterium, Curtobacterium, Rhodococcus, Xanthomonas and Pseudomonas, have shown promising results enhancing Rev. Int. Contam. Ambie. 33 (Especial Biotecnología e ingeniería ambiental) 7-21, 2017

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“…The monosaccharides' consumption (after 44 h) was almost the same in the SML and the SSL following aerosol additions (∼420 µg L −1 ), although different initial and end concentrations were recorded in both water layers ( Table 1). Monosaccharides are considered as the energetically-favored carbon sources for heterotrophic bacterial metabolism (Kirchman, 2012), as opposed to alkanes and α-olefins, which can be utilized only by a few specialized groups (Yakimov et al, 2007;Sevilla et al, 2015). Yet, based on the total leucine C incorporation during the experiment (derived from the BP measurements), less than 10% of the monosaccharides' reduction could be attributed to bacterial consumption in both water layers.…”

Section: Carbons Adsorption To Aerosol Particlesmentioning

confidence: 99%

The Impact of Dry Atmospheric Deposition on the Sea-Surface Microlayer in the SE Mediterranean Sea: An Experimental Approach

et al. 2016

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The oligotrophic southeastern Mediterranean Sea (SEMS) is frequently exposed to desert-dust deposition which supplies nutrients, trace metals and a wide array of viable airborne microorganisms. In this study, we experimentally examined the impact of aerosol addition, collected during an intense dust storm event in early September 2015, on the biomass and activity of pico-phytoplankton and heterotrophic bacterial populations at the sea-surface micro layer (SML) relative to the sub surface layer (SSL). Aerosol (1.5 mg L −1 ) was added to SML and SSL water samples in microcosms (4.5 L) and the water was frequently sampled over a period of 48 h. While the aerosol amendment triggered a moderate 1.5-2-fold increase in primary production in both the SML and the SSL, bacterial production increased by ∼3 and ∼7-folds in the SSL and SML, respectively. Concurrently, the abundance and flow-cytometric characteristics (green fluorescence and side scatter signals) of high nucleic acid (HNA) and low nucleic acid (LNA) bacterial cells showed a significant increase in the %HNA, in both SML and SSL samples following aerosol amendment. This shift in nucleic acid content took place at a much faster rate in the SML, suggesting a more active heterotrophic community. These changes were likely a result of higher rates of carbon utilizations in the SML following the dust addition, as assessed by a selected hydrocarbons and saccharides analysis. Additionally, a high absorption rate of hydrocarbons by the aerosol particles was measured following the additions, leaving less than 10% of these molecules available for potential heterotrophic microbial utilization. Our results suggest that the heterotrophic microbial community inhabiting the SML is more efficient in utilizing aerosol associated constituents than the community in the SSL.

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Processes in Microbial Ecology

Cited by 54 publications

References 604 publications

Soil Bacterial and Fungal Communities Show Distinct Recovery Patterns during Forest Ecosystem Restoration

Soil Bacterial and Fungal Communities Show Distinct Recovery Patterns during Forest Ecosystem Restoration

Contaminación Ambiental Por Metales Pesados en México: Problemática Y Estrategias De Fitorremediación

The Impact of Dry Atmospheric Deposition on the Sea-Surface Microlayer in the SE Mediterranean Sea: An Experimental Approach

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