Resource diversity structures aquatic bacterial communities

ABSTRACTMicrobial diversity is strongly affected by the bottom-up effects of resource availability. However, because resource pools often exist as heterogeneous mixtures of distinct molecules, resource heterogeneity may also affect community diversity. To test this hypothesis, we surveyed bacterial communities in lakes that varied in resource concentration. In addition, we characterized resource heterogeneity in these lakes using an ecosystem metabolomics approach. Overall, resource concentration and resource heterogeneity affected bacterial resource-diversity relationships. We found strong relationships between bacterial alpha-diversity (richness and evenness) and resource concentration and richness, but richness and evenness responded in different ways. Likewise, we found associations between the composition of the bacterial community and both resource concentration and composition, but the relationship with resource composition was stronger. Last, in the surveyed communities the presence of resource generalists may have reduced the effect of resource heterogeneity on community composition. These results have implications for understanding the interactions between bacteria and organic matter and suggest that changes in organic matter composition may alter the structure and function of bacterial communities.

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Chytrid fungi shape bacterial communities on model particulate organic matter

Biology Letters ◽

10.1098/rsbl.2020.0368 ◽

2020 ◽

Vol 16 (9) ◽

pp. 20200368

Author(s):

Cordelia Roberts ◽

Ro Allen ◽

Kimberley E. Bird ◽

Michael Cunliffe

Keyword(s):

Organic Matter ◽

Particulate Organic Matter ◽

Bacterial Communities ◽

Aquatic Ecosystems ◽

Bacterial Colonization ◽

Community Diversity ◽

Microbial Colonization ◽

Chytrid Fungus ◽

Associated Bacteria ◽

And Function

Microbial colonization and degradation of particulate organic matter (POM) are important processes that influence the structure and function of aquatic ecosystems. Although POM is readily used by aquatic fungi and bacteria, there is a limited understanding of POM-associated interactions between these taxa, particularly for early-diverging fungal lineages. Using a model ecological system with the chitin-degrading freshwater chytrid fungus Rhizoclosmatium globosum and chitin microbeads, we assessed the impacts of chytrid fungi on POM-associated bacteria. We show that the presence of chytrids on POM alters concomitant bacterial community diversity and structure, including differing responses between chytrid life stages. We propose that chytrids can act as ecosystem facilitators through saprotrophic feeding by producing ‘public goods’ from POM degradation that modify bacterial POM communities. This study suggests that chytrid fungi have complex ecological roles in aquatic POM degradation not previously considered, including the regulation of bacterial colonization, community succession and subsequent biogeochemical potential.

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Algal Exudates and Stream Organic Matter Influence the Structure and Function of Denitrifying Bacterial Communities

Microbial Ecology ◽

10.1007/s00248-012-0091-1 ◽

2012 ◽

Vol 64 (4) ◽

pp. 881-892 ◽

Cited By ~ 18

Author(s):

Kathryn N. Kalscheur ◽

Miguel Rojas ◽

Christopher G. Peterson ◽

John J. Kelly ◽

Kimberly A. Gray

Keyword(s):

Organic Matter ◽

Bacterial Communities ◽

Structure And Function ◽

And Function ◽

Algal Exudates

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Gill microbiome structure and function in the chemosymbiotic coastal lucinid Stewartia floridana

FEMS Microbiology Ecology ◽

10.1093/femsec/fiab042 ◽

2021 ◽

Author(s):

Shen Jean Lim ◽

Brenton Davis ◽

Danielle Gill ◽

John Swetenburg ◽

Laurie C Anderson ◽

...

Keyword(s):

Amino Acids ◽

Nutrient Cycling ◽

Bacterial Communities ◽

Structure And Function ◽

Differentially Expressed ◽

Seagrass Species ◽

Bare Sand ◽

And Function

Abstract Lucinid bivalves harbor environmentally acquired, chemosynthetic, gammaproteobacterial gill endosymbionts. Lucinid gill microbiomes, which may contain other gammaproteobacterial and/or spirochete taxa, remain under-sampled. To understand inter-host variability of the lucinid gill microbiome, specifically in the bacterial communities, we analyzed the microbiome content of Stewartia floridana collected from Florida. Sampled gills contained a monospecific gammaproteobacterial endosymbiont expressing lithoautotrophic, mixotrophic, diazotrophic, and C1 compound oxidation-related functions previously characterized in similar lucinid species. Another low-abundance Spirochaeta-like species in ∼72% of the sampled gills was most closely related to Spirochaeta-like species in another lucinid Phacoides pectinatus and formed a clade with known marine Spirochaeta symbionts. The spirochete expressed genes were involved in heterotrophy and the transport of sugars, amino acids, peptides, and other substrates. Few muscular and neurofilament genes from the host and none from the gammaproteobacterial and spirochete symbionts were differentially expressed among quadrats predominantly covered with seagrass species or 80% bare sand. Our results suggest that spirochetes are facultatively associated with S. floridana, with potential scavenging and nutrient cycling roles. Expressed stress- and defense-related functions in the host and symbionts also suggest species-species communications, which highlight the need for further study of the interactions among lucinid hosts, their microbiomes, and their environment.

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Lung ultrasound presentation of COVID-19 patients: phenotypes and correlations

Internal and Emergency Medicine ◽

10.1007/s11739-020-02620-9 ◽

2021 ◽

Author(s):

Gianmarco Secco ◽

◽

Marzia Delorenzo ◽

Francesco Salinaro ◽

Caterina Zattera ◽

...

Keyword(s):

Intensive Care Unit ◽

Intensive Care ◽

Lung Ultrasound ◽

Structure And Function ◽

General Ward ◽

Prognostic Role ◽

Interstitial Syndrome ◽

Lung Structure ◽

And Function ◽

The Relationship

AbstractBedside lung ultrasound (LUS) can play a role in the setting of the SarsCoV2 pneumonia pandemic. To evaluate the clinical and LUS features of COVID-19 in the ED and their potential prognostic role, a cohort of laboratory-confirmed COVID-19 patients underwent LUS upon admission in the ED. LUS score was derived from 12 fields. A prevalent LUS pattern was assigned depending on the presence of interstitial syndrome only (Interstitial Pattern), or evidence of subpleural consolidations in at least two fields (Consolidation Pattern). The endpoint was 30-day mortality. The relationship between hemogasanalysis parameters and LUS score was also evaluated. Out of 312 patients, only 36 (11.5%) did not present lung involvment, as defined by LUS score < 1. The majority of patients were admitted either in a general ward (53.8%) or in intensive care unit (9.6%), whereas 106 patients (33.9%) were discharged from the ED. In-hospital mortality was 25.3%, and 30-day survival was 67.6%. A LUS score > 13 had a 77.2% sensitivity and a 71.5% specificity (AUC 0.814; p < 0.001) in predicting mortality. LUS alterations were more frequent (64%) in the posterior lower fields. LUS score was related with P/F (R2 0.68; p < 0.0001) and P/F at FiO2 = 21% (R2 0.59; p < 0.0001). The correlation between LUS score and P/F was not influenced by the prevalent ultrasound pattern. LUS represents an effective tool in both defining diagnosis and stratifying prognosis of COVID-19 pneumonia. The correlation between LUS and hemogasanalysis parameters underscores its role in evaluating lung structure and function.

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Metabolic mediators of the relationship between adiposity and cardiac structure and function in UK adolescents

Revue d Épidémiologie et de Santé Publique ◽

10.1016/j.respe.2018.05.068 ◽

2018 ◽

Vol 66 ◽

pp. S260

Author(s):

A.R. Carter ◽

D.L. Santos Ferreira ◽

A. Taylor ◽

N. Chaturvedi ◽

A.D. Hughes ◽

...

Keyword(s):

Structure And Function ◽

Cardiac Structure ◽

Cardiac Structure And Function ◽

And Function ◽

The Relationship

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Substitution of manure for chemical fertilizer affects soil microbial community diversity, structure and function in greenhouse vegetable production systems

PLoS ONE ◽

10.1371/journal.pone.0214041 ◽

2020 ◽

Vol 15 (2) ◽

pp. e0214041 ◽

Cited By ~ 2

Author(s):

Haoan Luan ◽

Wei Gao ◽

Shaowen Huang ◽

Jiwei Tang ◽

Mingyue Li ◽

...

Keyword(s):

Production Systems ◽

Structure And Function ◽

Community Diversity ◽

Vegetable Production ◽

Microbial Community Diversity ◽

Soil Microbial ◽

Greenhouse Vegetable ◽

And Function ◽

Diversity Structure ◽

Greenhouse Vegetable Production

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The Relationship Between Structure and Function of Tight Junctions

Tight Junctions ◽

10.1201/9781420038538.ch5 ◽

2001 ◽

Cited By ~ 3

Author(s):

Lorenza González-Mariscal ◽

Antonia Avila ◽

Abigail Betanzos

Keyword(s):

Tight Junctions ◽

Structure And Function ◽

And Function ◽

The Relationship

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The Relationship Between Structure and Function of Tight Junctions

Tight Junctions ◽

10.1201/9781420038538-7 ◽

2001 ◽

pp. 107-138

Keyword(s):

Tight Junctions ◽

Structure And Function ◽

And Function ◽

The Relationship

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Childhood and adult exposure to secondhand tobacco smoke and cardiac structure and function: results from Echo-SOL

Open Heart ◽

10.1136/openhrt-2018-000831 ◽

2018 ◽

Vol 5 (2) ◽

pp. e000831 ◽

Cited By ~ 2

Author(s):

Melissa Suzanne Burroughs Peña ◽

Katrina Swett ◽

Robert C Kaplan ◽

Krista Perreira ◽

Martha Daviglus ◽

...

Keyword(s):

Left Ventricular ◽

Structure And Function ◽

Cardiac Structure ◽

Isovolumic Relaxation Time ◽

Shs Exposure ◽

Cardiac Structure And Function ◽

And Function ◽

Relationship Of ◽

The Relationship ◽

Isovolumic Relaxation

ObjectiveTo describe the relationship of household secondhand smoke (SHS) exposure and cardiac structure and function.MethodsParticipants (n=1069; 68 % female; age 45–74 years) without history of tobacco use, coronary artery disease or severe valvular disease were included. Past childhood (starting at age <13 years), adolescent/adult and current exposure to household SHS was assessed. Survey linear regression analyses were used to model the relationship of SHS exposure and echocardiographic measures of cardiac structure and function, adjusting for covariates (age, sex, study site, alcohol use, physical activity and education).ResultsSHS exposure in childhood only was associated with reduced E/A velocity ratio (β=−0.06 (SE 0.02), p=0.008). SHS exposure in adolescence/adult only was associated with increased left ventricular ejection fraction (LVEF) (1.2 (0.6), p=0.04), left atrial volume index (1.7 (0.8), p=0.04) and decreased isovolumic relaxation time (−0.003 (0.002), p=0.03). SHS exposure in childhood and adolescence/adult was associated with worse left ventricular global longitudinal strain (LVGLS) (two-chamber) (0.8 (0.4), p= 0.049). Compared with individuals who do not live with a tobacco smoker, individuals who currently live with at least one tobacco smoker had reduced LVEF (−1.4 (0.6), p=0.02), LVGLS (average) (0.9 (0.40), p=0.03), medial E′ velocity (−0.5 (0.2), p=0.01), E/A ratio (−0.09 (0.03), p=0.003) and right ventricular fractional area change (−0.02 (0.01), p=0.01) with increased isovolumic relaxation time (0.006 (0.003), p=0.04).ConclusionsPast and current household exposure to SHS was associated with abnormalities in cardiac systolic and diastolic function. Reducing household SHS exposure may be an opportunity for cardiac dysfunction prevention to reduce the risk of future clinical heart failure.

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