scholarly journals Structure and function of zooplankton-associated bacterial communities in a temperate estuary change more with time than with zooplankton species

2014 ◽  
Vol 72 (1) ◽  
pp. 1-15 ◽  
Author(s):  
SL Bickel ◽  
KW Tang ◽  
HP Grossart
Keyword(s):  
Bacterial Communities ◽  
Structure And Function ◽  
Zooplankton Species ◽  
Temperate Estuary ◽  
And Function

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

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.

scholarly journals Continuous-Flow Capillary Assay for Measuring Bacterial Chemotaxis

2005 ◽  
Vol 71 (6) ◽  
pp. 3137-3143 ◽  
Author(s):  
Aaron M. J. Law ◽  
Michael D. Aitken
Keyword(s):  
Predictive Models ◽  
Bacterial Communities ◽  
Continuous Flow ◽  
Bacterial Chemotaxis ◽  
Structure And Function ◽  
Bacterial Transport ◽  
Transport Parameters ◽  
And Function ◽  
Bacterial Concentrations ◽  
Flow Capillary

ABSTRACT Bacterial chemotaxis may have a significant impact on the structure and function of bacterial communities. Quantification of chemotactic motion is necessary to identify chemoeffectors and to determine the bacterial transport parameters used in predictive models of chemotaxis. When the chemotactic bacteria consume the chemoeffector, the chemoeffector gradient to which the bacteria respond may be significantly perturbed by the consumption. Therefore, consumption of the chemoeffector can confound chemotaxis measurements if it is not accounted for. Current methods of quantifying chemotaxis use bacterial concentrations that are too high to preclude chemoeffector consumption or involve ill-defined conditions that make quantifying chemotaxis difficult. We developed a method of quantifying bacterial chemotaxis at low cell concentrations (∼105 CFU/ml), so metabolism of the chemoeffector is minimized. The method facilitates quantification of bacterial-transport parameters by providing well-defined boundary conditions and can be used with volatile and semivolatile chemoeffectors.

Investigations of the structure and function of bacterial communities associated with Sphagnum mosses

2007 ◽  
Vol 9 (11) ◽  
pp. 2795-2809 ◽  
Author(s):  
Katja Opelt ◽  
Vladimir Chobot ◽  
Franz Hadacek ◽  
Susan Schönmann ◽  
Leo Eberl ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Structure And Function ◽  
Sphagnum Mosses ◽  
And Function

scholarly journals Resource diversity structures aquatic bacterial communities

2018 ◽  
Author(s):  
Mario E. Muscarella ◽  
Claudia M. Boot ◽  
Corey D. Broeckling ◽  
Jay T. Lennon
Keyword(s):  
Organic Matter ◽  
Bacterial Communities ◽  
Alpha Diversity ◽  
Structure And Function ◽  
Community Diversity ◽  
Resource Heterogeneity ◽  
Resource Concentration ◽  
And Function ◽  
Resource Diversity ◽  
The Relationship

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.

scholarly journals Water and Heat-Triggered Changes of Bacterial Community Structure and Function in Biological Soil Crusts

2021 ◽  
Author(s):  
Xiaoting Wei ◽  
Fuwen Qin ◽  
Bing Han ◽  
Huakun Zhou ◽  
Miao Liu ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Bacterial Community Structure ◽  
Aridity Index ◽  
Soil Improvement ◽  
Biological Soil Crusts ◽  
Structure And Function ◽  
Soil Crusts ◽  
And Function

Abstract Background and Aims：The outstanding ability of biological soil crusts (BSCs) in soil microenvironments regulation is mainly attribute to microorganisms that colonizing in biocrusts. We aimed to investigate the changes of bacterial community structure and function with biocrust succession, as well as their responses to climatic changes across large geographical scales.Methods: Algal BSCs and lichen BSCs were sampled along an aridity gradient on alpine grasslands. Bacterial communities in biocrusts were measured using high-throughput sequencing, and soil underlying biocrusts (0-5 cm) was collected for nutrients determination. Results: Our results indicated that compared with algal BSCs, bacterial community in lichen BSCs was characterized by lower diversity, more complex co-occurrence network and mutually beneficial relationships. The bacterial community assembly was governed mainly by stochastic processes for lichen BSCs, which was different from the almost equally important roles of stochastic and deterministic processes for algal BSCs. Geographical location had a significant effect on bacterial communities in both algal and lichen BSCs, while had a greater effect on lichen BSCs. It is noteworthy that the bacterial diversity of algal BSCs was positively correlated with aridity index, while that of lichens was negatively correlated with aridity index. Moreover, we determined lower soil pH and higher soil phosphorus content underlying lichen BSCs, implying their advantages in soil improvement. Conclusions: Aridity index was one of important driving factors of bacterial community in biocrusts, and its effects were biocrust type dependent. Lichen BSCs had greater effects on soil improvement than that of algal BSCs.

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