scholarly journals Structure and function of denitrifying and nitrifying bacterial communities in relation to the plant species in a constructed wetland

2009 ◽  
Vol 67 (2) ◽  
pp. 308-319 ◽  
Author(s):  
Olaya Ruiz-Rueda ◽  
Sara Hallin ◽  
Lluis Bañeras
Keyword(s):  
Plant Species ◽  
Constructed Wetland ◽  
Bacterial Communities ◽  
Structure And Function ◽  
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.

scholarly journals The Dynamic of Pekarangan Selahuni 2 Homlet, Ciomas Rahayu Village, Bogor

2020 ◽  
Vol 10 (3) ◽  
pp. 364-373
Author(s):  
Muhammad Saddam Ali ◽  
Hadi Susilo Arifin ◽  
Nurhayati H.S. Arifin
Keyword(s):  
Plant Species ◽  
Ornamental Plants ◽  
Structure And Function ◽  
Ornamental Plant ◽  
Average Area ◽  
The Past ◽  
Main Factors ◽  
And Function

Urbanization and fragmentation are the main factors causing dynamics in the pekarangan. The dynamics that occur are related to the structure and function of the pekarangan. This makes the pekarangan performance changes according to the interference of the pekarangan owner. Selahuni 2 Homlet, Ciomas Rahayu Village, Bogor has become the location for observing the dynamics of the past two decades. Pekarangan samples taken in 2019 are exactly the same as those taken in 1998 and 2007, totaling 10 houses. The aim is to determine the extent of changes that occur in the pekarangan, both structure and function. Measuring the area, ownership of the pekarangan, recording of species and function of the existing vegetation of the pekarangan. In 2019, data on ownership of houses and pekarangans by old owners dropped dramatically by only 40%. In 2019, the average pekarangan area will decrease by an average area of 110.81 m2. In 1998, 2007 and 2019, the percentage of the number of non-ornamental plant species was 4-10% higher than that of ornamental plants. Therefore, there was a change in both the extent and ownership, function and structure of the vegetation in the Selahuni 2 Homlet’s pekarangan which was caused by urbanization and fragmentation factors.

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

An Analysis of US State Regulated Weed Lists: A Discordance between Biology and Policy

BioScience ◽  
2020 ◽  
Vol 70 (9) ◽  
pp. 804-813
Author(s):  
Vasiliy T Lakoba ◽  
Rachel K Brooks ◽  
David C Haak ◽  
Jacob N Barney
Keyword(s):  
United States ◽  
Global Change ◽  
Plant Species ◽  
Invasive Plants ◽  
Food Supply ◽  
The United States ◽  
Structure And Function ◽  
Comprehensive Analysis ◽  
And Function ◽  
Unique Species

Abstract Weedy and invasive plants threaten our food supply, native biodiversity, and the structure and function of ecosystems. The number and impact of these damaging plants are expected to continue to grow with ongoing global change. Some of the most common policy tools to help mitigate this threat are regulatory weed lists, which limit the importation and movement of listed plant species, but there has never been a comprehensive analysis of plants regulated in the United States. We analyzed US state regulatory lists (e.g., noxious, invasive, prohibited) to evaluate their composition, patterns of listing, congruities with weed distributions, and limitations. In total, 46 states maintain regulatory weed lists that include 3210 total listings of 1249 unique species; 48% of them are introduced, 40% are native, and 12% are not yet found in the United States. Overall, the listed species are not a good reflection of the weeds in each state, and listing appears largely reactive, regulating species after they become widespread. We highlight patterns and incongruities among lists and discuss their implications, especially the large number of regulated species native to the United States.

scholarly journals Distribution of Littoral Macrophytes in Jackson Lake, Wyoming

1983 ◽  
Vol 7 ◽  
pp. 73-76
Author(s):  
C. Brewer ◽  
M. Parker
Keyword(s):  
Plant Species ◽  
National Park ◽  
Structure And Function ◽  
Distribution Data ◽  
Grand Teton National Park ◽  
Littoral Habitat ◽  
Macrophyte Community ◽  
Field Season ◽  
Relative Abundances ◽  
And Function

The research described here is part of a 2-year study to characterize the structure and function of the littoral macrophyte community in Jackson Lake, Grand Teton National Park. The objectives for the 1st year were: 1) to identify the plant species occuring in the lake; 2) to quantify their relative abundances; 3) to characterize the littoral habitat, and; 4) to construct a detailed map of macrophyte distribution. Data collected during the first field season will be used to help evaluate results of experiments conducted during year two on mechanisms affecting macrophyte segregation.

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