Homogeneous environmental selection dominates microbial community assembly in the oligotrophic South Pacific Gyre

2020 ◽  
Vol 29 (23) ◽  
pp. 4680-4691
Author(s):  
Ro Allen ◽  
Linn J. Hoffmann ◽  
Matthew J. Larcombe ◽  
Ziva Louisson ◽  
Tina C. Summerfield
Keyword(s):  
Microbial Community ◽  
Community Assembly ◽  
South Pacific ◽  
Environmental Selection ◽  
South Pacific Gyre ◽  
Microbial Community Assembly

scholarly journals Dominant Tree Species Shape Soil Microbial Community via Regulating Assembly Processes in Planted Subtropical Forests

Forests ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 978
Author(s):  
Ma ◽  
Zou ◽  
Yang ◽  
Hogan ◽  
Xu ◽  
...  
Keyword(s):  
Microbial Community ◽  
Microbial Communities ◽  
Soil Nutrients ◽  
Community Assembly ◽  
Soil Microbial Community ◽  
Soil Microbial Communities ◽  
Soil Microbial ◽  
Environmental Selection ◽  
Α Diversity ◽  
Microbial Community Assembly

Understanding the ecological processes that regulate microbial community assembly in different habitats is critical to predict microbial responses to anthropogenic disturbances and environmental changes. Rubber (Hevea brasiliensis) and Eucalypt (Eucalyptus urophylla) plantations (thereafter RP and EP) are rapidly established at the expense of forests in tropical China, greatly affecting tropical soils and their processes. However, the assembly processes of soil microbial communities after forest conversions remain unclear. We investigated soil microbial communities’ attributes and quantified the portion of deterministic assembly variation in two RP (a 3- and a 5-year-old) and two EP (a 2- and a 4-year-old) in Southern China. Shannon and Faith’s Phylogenetic α-diversity of both bacterial and fungal communities were higher in RP than in EP, regardless of plantation age or soil depth (0–50 cm). Bacterial and fungal community structure was significantly different among the four plantations. The dominant microbial taxa in RP closely tracked the availability of nitrogen, phosphorus and potassium (K) while those in EP were closely related to the high total K content. Microbial co-occurrence networks in RP were more modular than those in EP, as governed by more keystone taxa that were strongly dependent on soil available nutrients. Environmental filtering imposed by soil nutrients heterogeneity contributed a considerable portion (33–47%) of bacterial assembly variation in RP, but much less (8–14%) in EP. The relative contribution of environmental selection on fungal assembly was also greater in RP than in EP. Our findings suggest that in RP clear microbial community patterns exist with respect to soil nutrients, whereas in EP microbial community assembly patterns are more stochastic and variable. The large variation in soil microbial community assembly patterns in EP could lead to fragile and unstable microbial-soil relationships, which may be one factor driving soil degradation in EP.

scholarly journals Historical contingency impacts on community assembly and ecosystem function in chemosynthetic marine ecosystems

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dimitri Kalenitchenko ◽  
Erwan Peru ◽  
Pierre E. Galand
Keyword(s):  
Community Assembly ◽  
Sea Water ◽  
Marine Ecosystem ◽  
Marine Ecosystems ◽  
Metagenomic Sequencing ◽  
Historical Contingency ◽  
Historical Events ◽  
Species Sorting ◽  
Environmental Selection ◽  
Microbial Community Assembly

AbstractPredicting ecosystem functioning requires an understanding of the mechanisms that drive microbial community assembly. Many studies have explored microbial diversity extensively and environmental factors are thought to be the principal drivers of community composition. Community assembly is, however, also influenced by past conditions that might affect present-day assemblages. Historical events, called legacy effects or historical contingencies, remain poorly studied in the sea and their impact on the functioning of the communities is not known. We tested the influence, if any, of historical contingencies on contemporary community assembly and functions in a marine ecosystem. To do so, we verified if different inoculum communities colonizing the same substrate led to communities with different compositions. We inoculated wood with sea water microbes from different marine environments that differ in ecological and evolutionary history. Using 16S rRNA and metagenomic sequencing, it was demonstrated that historical contingencies change the composition and potential metabolisms of contemporary communities. The effect of historical events was transient, dominated by environmental selection as, over time, species sorting was a more important driver of community assembly. Our study shows not only that historical contingencies affect marine ecosystems but takes the analysis a step further by characterizing this effect as strong but transient.

Microbial community assembly and metabolic function during mammalian corpse decomposition

Science ◽  
2015 ◽  
Vol 351 (6269) ◽  
pp. 158-162 ◽  
Author(s):  
J. L. Metcalf ◽  
Z. Z. Xu ◽  
S. Weiss ◽  
S. Lax ◽  
W. Van Treuren ◽  
...  
Keyword(s):  
Microbial Community ◽  
Community Assembly ◽  
Metabolic Function ◽  
Microbial Community Assembly

scholarly journals Emergent Simplicity in Microbial Community Assembly

2017 ◽  
Author(s):  
Joshua E. Goldford ◽  
Nanxi Lu ◽  
Djordje Bajic ◽  
Sylvie Estrela ◽  
Mikhail Tikhonov ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Community Assembly ◽  
Competitive Exclusion ◽  
Ex Situ ◽  
Coarse Grained ◽  
Natural Environments ◽  
Complex Dynamic ◽  
Microbial Community Assembly ◽  
Consumer Resource

AbstractMicrobes assemble into complex, dynamic, and species-rich communities that play critical roles in human health and in the environment. The complexity of natural environments and the large number of niches present in most habitats are often invoked to explain the maintenance of microbial diversity in the presence of competitive exclusion. Here we show that soil and plant-associated microbiota, cultivated ex situ in minimal synthetic environments with a single supplied source of carbon, universally re-assemble into large and dynamically stable communities with strikingly predictable coarse-grained taxonomic and functional compositions. We find that generic, non-specific metabolic cross-feeding leads to the assembly of dense facilitation networks that enable the coexistence of multiple competitors for the supplied carbon source. The inclusion of universal and non-specific cross-feeding in ecological consumer-resource models is sufficient to explain our observations, and predicts a simple determinism in community structure, a property reflected in our experiments.

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