scholarly journals Diversity and Temporal Dynamics of the Epiphytic Bacterial Communities Associated with the Canopy-Forming Seaweed Cystoseira compressa (Esper) Gerloff and Nizamuddin

2016 ◽  
Vol 7 ◽  
Author(s):  
Francesco P. Mancuso ◽  
Sofie D'Hondt ◽  
Anne Willems ◽  
Laura Airoldi ◽  
Olivier De Clerck
Keyword(s):  
Bacterial Communities ◽  
Temporal Dynamics ◽  
Cystoseira Compressa

scholarly journals Modeling the temporal dynamics of cervicovaginal microbiota identifies targets that may promote reproductive health

Microbiome ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexander Munoz ◽  
Matthew R. Hayward ◽  
Seth M. Bloom ◽  
Muntsa Rocafort ◽  
Sinaye Ngcapu ◽  
...  
Keyword(s):  
High Risk ◽  
Bacterial Communities ◽  
High Probability ◽  
Temporal Dynamics ◽  
Transition Probabilities ◽  
Low Risk ◽  
Sub Saharan Africa ◽  
Reproductive Outcomes ◽  
Bacterial Composition ◽  
Sub Saharan

Abstract Background Cervicovaginal bacterial communities composed of diverse anaerobes with low Lactobacillus abundance are associated with poor reproductive outcomes such as preterm birth, infertility, cervicitis, and risk of sexually transmitted infections (STIs), including human immunodeficiency virus (HIV). Women in sub-Saharan Africa have a higher prevalence of these high-risk bacterial communities when compared to Western populations. However, the transition of cervicovaginal communities between high- and low-risk community states over time is not well described in African populations. Results We profiled the bacterial composition of 316 cervicovaginal swabs collected at 3-month intervals from 88 healthy young Black South African women with a median follow-up of 9 months per participant and developed a Markov-based model of transition dynamics that accurately predicted bacterial composition within a broader cross-sectional cohort. We found that Lactobacillus iners-dominant, but not Lactobacillus crispatus-dominant, communities have a high probability of transitioning to high-risk states. Simulating clinical interventions by manipulating the underlying transition probabilities, our model predicts that the population prevalence of low-risk microbial communities could most effectively be increased by manipulating the movement between L. iners- and L. crispatus-dominant communities. Conclusions The Markov model we present here indicates that L. iners-dominant communities have a high probability of transitioning to higher-risk states. We additionally identify transitions to target to increase the prevalence of L. crispatus-dominant communities. These findings may help guide future intervention strategies targeted at reducing bacteria-associated adverse reproductive outcomes among women living in sub-Saharan Africa.

Temporal dynamics of bacterial communities in the water and sediments of sea cucumber (Apostichopus japonicus) culture ponds

Aquaculture ◽  
2020 ◽  
Vol 528 ◽  
pp. 735498
Author(s):  
Zelong Zhao ◽  
Jingwei Jiang ◽  
Yongjia Pan ◽  
Ying Dong ◽  
Zhong Chen ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Sea Cucumber ◽  
Temporal Dynamics ◽  
Apostichopus Japonicus

scholarly journals Diversity of Epiphytic Bacterial Communities Associated with Adriatic Fucacean Species Phycosphere

2020 ◽  
Vol 8 (12) ◽  
pp. 967
Author(s):  
Maria Blažina ◽  
Ljiljana Iveša ◽  
Ksenija Matošović ◽  
Emina Pustijanac ◽  
Massimo Devescovi ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Community Structure ◽  
Polyunsaturated Fatty Acids ◽  
Bacterial Communities ◽  
Saturated Fatty Acids ◽  
Strong Relationship ◽  
Scaling Analysis ◽  
Biological Interactions ◽  
Cystoseira Compressa ◽  
The Relationship

The aim of the study was to explore the relationship between membrane-regulating functional lipids of three fucacean species and their associated epiphytic bacterial communities. The analyzed algae Treptacantha barbata, Carpodesmia crinita and Cystoseira compressa, formerly classified under the Cystoseira genus, are indigenous to the Adriatic Sea. The thalli of sampled Fucales species were divided into perennial and annual parts. T. barbata and C. crinita show high contents of mono- and polyunsaturated fatty acids but, however, show a clear distinction between branches, cauloids and apical parts. Along with the highest unsaturation degree (4.32), the C. crinita branches and apical parts demonstrated high proportion of both C18 and C20 polyunsaturated fatty acids, with eicosapentaenoic (C20:5 n-3) and arachidonic (C20:4 n-6) fatty acids up to 5.46% and 13.82%, respectively. The highest proportion of saturated fatty acids was found in thalli of C. compressa, particularly on cauloids and old branches (≥90%). The similarity profile routine analysis of fatty acids and microbial community structure has shown clear separation of the cauloids and apical parts from the branches of C. crinita and T. barbata. Based on the nonmetric multidimensional scaling analysis several representatives of the Gammaproteobacteria class, identified as Vibrionales (Vibrio), Cellvibrionales and Xanthomonadales, which contributed strongly to the separation of T. barbata apical parts and branches, C. compressa receptacles and C. crinita branches from the T. barbata cauloids and C. crinita apical parts and cauloids. The highest richness in polyunsaturated fatty acids, in particular C18:3(n-3), C20:4(n-6) and C20:5(n-3), was observed on branches, accompanied by a distinctive epiphytic microbial structure dominated by numerous representatives with potentially beneficial biological activity. The results showed a strong relationship between fatty acid profiles of the analyzed species and phycosphere community structure, underlining the host physiological condition in shaping the biological interactions and maintaining a healthy microbiome, as well as compiling the ecophysiological and molecular research in order to better assess the resilience of the ecosystem.

scholarly journals Structure and temporal dynamics of the bacterial communities associated to microhabitats of the coralOculina patagonica

2016 ◽  
Vol 18 (12) ◽  
pp. 4564-4578 ◽  
Author(s):  
Esther Rubio-Portillo ◽  
Fernando Santos ◽  
Manuel Martínez-García ◽  
Asunción de los Ríos ◽  
Carmen Ascaso ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Temporal Dynamics

Temporal dynamics of sediment bacterial communities in monospecific stands of Juncus maritimus and Spartina maritima

Plant Biology ◽  
2016 ◽  
Vol 18 (5) ◽  
pp. 824-834 ◽  
Author(s):  
D. F. R. Cleary ◽  
A. R. M. Polónia ◽  
A. I. Sousa ◽  
A. I. Lillebø ◽  
H. Queiroga ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Temporal Dynamics ◽  
Spartina Maritima ◽  
Juncus Maritimus ◽  
Sediment Bacterial Communities

scholarly journals Press xenobiotic disturbance favors deterministic assembly with a shift in function and structure of bacterial communities in sludge bioreactors

2020 ◽  
Author(s):  
Ezequiel Santillan ◽  
Hari Seshan ◽  
Stefan Wuertz
Keyword(s):  
Community Structure ◽  
Bacterial Communities ◽  
Temporal Dynamics ◽  
Treatment Plant ◽  
Amplicon Sequencing ◽  
Rrna Gene ◽  
Batch Reactors ◽  
Function Structure ◽  
Community Function ◽  
And Function

AbstractDisturbance is thought to affect community assembly mechanisms, which in turn shape community structure and the overall function of the ecosystem. Here, we tested the effect of a continuous (press) xenobiotic disturbance on the function, structure, and assembly of bacterial communities within a wastewater treatment system. Two sets of four-liter sequencing batch reactors were operated in triplicate with and without the addition of 3-chloroaniline for a period of 132 days, following 58 days of acclimation after inoculation with sludge from a full-scale treatment plant. Temporal dynamics of bacterial community structure were derived from 16S rRNA gene amplicon sequencing. Community function, structure and assembly differed between press disturbed and undisturbed reactors. Temporal partitioning of assembly mechanisms via phylogenetic and non-phylogenetic null modelling analysis revealed that deterministic assembly prevailed for disturbed bioreactors, while the role of stochastic assembly was stronger for undisturbed reactors. Our findings are relevant because research spanning various disturbance types, environments and spatiotemporal scales is needed for a comprehensive understanding of the effects of press disturbances on assembly mechanisms, structure, and function of microbial communities.Graphical abstract

scholarly journals The Soil Microbiome Influences Grapevine-Associated Microbiota

mBio ◽  
2015 ◽  
Vol 6 (2) ◽  
Author(s):  
Iratxe Zarraonaindia ◽  
Sarah M. Owens ◽  
Pamela Weisenhorn ◽  
Kristin West ◽  
Jarrad Hampton-Marcell ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Management Practices ◽  
Temporal Dynamics ◽  
Spatial Scales ◽  
C:N Ratio ◽  
Soil Microbiome ◽  
Plant Growth Promoting Bacteria ◽  
Organoleptic Properties ◽  
Associated Bacteria ◽  
Plant Growth Promoting

ABSTRACTGrapevine is a well-studied, economically relevant crop, whose associated bacteria could influence its organoleptic properties. In this study, the spatial and temporal dynamics of the bacterial communities associated with grapevine organs (leaves, flowers, grapes, and roots) and soils were characterized over two growing seasons to determine the influence of vine cultivar, edaphic parameters, vine developmental stage (dormancy, flowering, preharvest), and vineyard. Belowground bacterial communities differed significantly from those aboveground, and yet the communities associated with leaves, flowers, and grapes shared a greater proportion of taxa with soil communities than with each other, suggesting that soil may serve as a bacterial reservoir. A subset of soil microorganisms, including root colonizers significantly enriched in plant growth-promoting bacteria and related functional genes, were selected by the grapevine. In addition to plant selective pressure, the structure of soil and root microbiota was significantly influenced by soil pH and C:N ratio, and changes in leaf- and grape-associated microbiota were correlated with soil carbon and showed interannual variation even at small spatial scales. Diazotrophic bacteria, e.g.,Rhizobiaceaeand Bradyrhizobium spp., were significantly more abundant in soil samples and root samples of specific vineyards. Vine-associated microbial assemblages were influenced by myriad factors that shape their composition and structure, but the majority of organ-associated taxa originated in the soil, and their distribution reflected the influence of highly localized biogeographic factors and vineyard management.IMPORTANCEVine-associated bacterial communities may play specific roles in the productivity and disease resistance of their host plant. Also, the bacterial communities on grapes have the potential to influence the organoleptic properties of the wine, contributing to a regional terroir. Understanding that factors that influence these bacteria may provide insights into management practices to shape and craft individual wine properties. We show that soil serves as a key source of vine-associated bacteria and that edaphic factors and vineyard-specific properties can influence the native grapevine microbiome preharvest.

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