scholarly journals Complexity of Bacterial Communities in a River-Floodplain System (Danube, Austria)

2005 ◽  
Vol 71 (2) ◽  
pp. 609-620 ◽  
Author(s):  
Katharina Besemer ◽  
Markus M. Moeseneder ◽  
Jesus M. Arrieta ◽  
Gerhard J. Herndl ◽  
Peter Peduzzi
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Temporal Dynamics ◽  
Bacterial Community Composition ◽  
Inorganic Nutrients ◽  
Danube River ◽  
Polymorphism Analysis ◽  
Free Living ◽  
River Floodplain

ABSTRACT Natural floodplains play an essential role in the processing and decomposition of organic matter and in the self-purification ability of rivers, largely due to the activity of bacteria. Knowledge about the composition of bacterial communities and its impact on organic-matter cycling is crucial for the understanding of ecological processes in river-floodplain systems. Particle-associated and free-living bacterial assemblages from the Danube River and various floodplain pools with different hydrological characteristics were investigated using terminal restriction fragment length polymorphism analysis. The particle-associated bacterial community exhibited a higher number of operational taxonomic units (OTUs) and was more heterogeneous in time and space than the free-living community. The temporal dynamics of the community structure were generally higher in isolated floodplain pools. The community structures of the river and the various floodplain pools, as well as those of the particle-associated and free-living bacteria, differed significantly. The compositional dynamics of the planktonic bacterial communities were related to changes in the algal biomass, temperature, and concentrations of organic and inorganic nutrients. The OTU richness of the free-living community was correlated with the concentration and origin of organic matter and the concentration of inorganic nutrients, while no correlation with the OTU richness of the particle-associated assemblage was found. Our results demonstrate the importance of the river-floodplain interactions and the influence of damming and regulation on the bacterial-community composition.

scholarly journals Small tropical islands with dense human population: Differences in water quality of near-shore waters are associated with distinct bacterial communities

2018 ◽  
Author(s):  
Hauke Kegler ◽  
Christiane Hassenrueck ◽  
Pia Kegler ◽  
Tim C Jennerjahn ◽  
Muhammad Lukman ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Coral Reef ◽  
Bacterial Community ◽  
Water Column ◽  
Community Composition ◽  
Bacterial Communities ◽  
Bacterial Community Composition ◽  
Back Reef ◽  
Anthropogenic Inputs

Water quality deterioration caused by an enrichment in inorganic and organic matter due to anthropogenic inputs is one of the major local threats to coral reefs in Indonesia. However, even though bacteria are important mediators in coral reef ecosystems, little is known about the response of individual taxa and whole bacterial communities to these anthropogenic inputs. The present study is the first to investigate how bacterial community composition responds to small-scale changes in water quality in several coral reef habitats of the Spermonde Archipelago including the water column, particles and back reef sediments, on a densely populated and an uninhabited island. The main aims were to elucidate if a) water quality indicators and organic matter concentrations differ between the uninhabited and the densely populated island of the archipelago, and b) if there are differences in bacterial community composition in back-reef sediments and in the water column, which are associated with differences in water quality. Several key water quality parameters, such as inorganic nitrate and phosphate, chlorophyll a, and transparent exopolymer particles (TEP) were significantly higher at the inhabited than at the uninhabited island. Bacterial communities in sediments and particle attached communities were significantly different between the two islands with bacterial taxa commonly associated with nutrient and organic matter rich conditions occurring in higher proportions at the inhabited island. Within the individual reef habitats, variations in bacterial community composition between the islands are associated with differences in water quality. We also observed that copiotrophic, opportunistic bacterial taxa were enriched at the inhabited island with its higher chlorophyll a, dissolved organic carbon (DOC) and TEP concentrations. Given the increasing strain on tropical coastal ecosystems, this study suggests that effluents from densely populated islands lacking sewage treatment can alter bacterial communities that may be important for coral reef ecosystem function.

scholarly journals Small tropical islands with dense human population: differences in water quality of near-shore waters are associated with distinct bacterial communities

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4555 ◽  
Author(s):  
Hauke F. Kegler ◽  
Christiane Hassenrück ◽  
Pia Kegler ◽  
Tim C. Jennerjahn ◽  
Muhammad Lukman ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Coral Reef ◽  
Bacterial Community ◽  
Water Column ◽  
Community Composition ◽  
Bacterial Communities ◽  
Bacterial Community Composition ◽  
Back Reef ◽  
Anthropogenic Inputs

Water quality deterioration caused by an enrichment in inorganic and organic matter due to anthropogenic inputs is one of the major local threats to coral reefs in Indonesia. However, even though bacteria are important mediators in coral reef ecosystems, little is known about the response of individual taxa and whole bacterial communities to these anthropogenic inputs. The present study is the first to investigate how bacterial community composition responds to small-scale changes in water quality in several coral reef habitats of the Spermonde Archipelago including the water column, particles, and back-reef sediments, on a densely populated and an uninhabited island. The main aims were to elucidate if (a) water quality indicators and organic matter concentrations differ between the uninhabited and the densely populated island of the archipelago, and (b) if there are differences in bacterial community composition in back-reef sediments and in the water column, which are associated with differences in water quality. Several key water quality parameters, such as inorganic nitrate and phosphate, chlorophylla, and transparent exopolymer particles (TEP) were significantly higher at the inhabited than at the uninhabited island. Bacterial communities in sediments and particle-attached communities were significantly different between the two islands with bacterial taxa commonly associated with nutrient and organic matter-rich conditions occurring in higher proportions at the inhabited island. Within the individual reef habitats, variations in bacterial community composition between the islands were associated with differences in water quality. We also observed that copiotrophic, opportunistic bacterial taxa were enriched at the inhabited island with its higher chlorophylla, dissolved organic carbon and TEP concentrations. Given the increasing strain on tropical coastal ecosystems, this study suggests that effluents from densely populated islands lacking sewage treatment can alter bacterial communities that may be important for coral reef ecosystem function.

scholarly journals Soil bacterial community triggered by organic matter inputs supports a high-yielding pear production

2021 ◽  
Author(s):  
Li Wang ◽  
Xiaomei Ye ◽  
Hangwei Hu ◽  
Jing Du ◽  
Yonglan Xi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Structural Equation ◽  
Crop Production ◽  
Bacterial Community Composition ◽  
Soil Microbiome ◽  
High Yield ◽  
Common Features

Abstract. The roles of microorganisms in enhancing crop production have been demonstrated for a range of cropping systems. Most studies to date, however, have been confined to a limited number of locations, making it difficult to identify general soil biotic and abiotic characteristics underpinning the yield-promotion across various locations. This knowledge gap limits our capacity to harness soil microbiome to improve crop production. Here we used high-throughput amplicon sequencing to investigate the common features of bacterial community composition, ecological networks and physicochemical properties in six yield-invigorating and adjacent yield-debilitating orchards. We found that yield-invigorating soils exhibited higher contents of organic matter than yield-debilitating soils and harboured unique bacterial communities. Greater alpha diversity and higher relative abundances of Planctomycetes and Chloroflexi were observed in yield-debilitating soils. Co-occurrence network analysis revealed that yield-invigorating soils displayed a greater number of meta-modules and a higher proportion of negative links to positive links. Chloroflexi was recognized as a keystone taxon in manipulating the interaction of bacterial communities in yield-invigorating soils. Structural equation modelling showed that soil organic matter, beta diversity of bacterial community, and network connector (Chloroflexi) were key factors supporting high-yield pear production. Altogether, we provide evidence that yield-invigorating soils across a range of locations appear to share common features, including accumulation of soil organic matter, higher microbial diversity, enrichment of key taxa like Chloroflexi, and maintaining a competitive network. These findings have implications for science-based guidance for sustainable food production.

scholarly journals Impacts of Extreme Weather Events on Bacterial Community Composition of a Temperate Humic Lake

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2757
Author(s):  
Alexa Hoke ◽  
Jason Woodhouse ◽  
Luca Zoccarato ◽  
Valerie McCarthy ◽  
Elvira de Eyto ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
Bacterial Communities ◽  
Bacterial Community Composition ◽  
Critical Role ◽  
Extreme Weather ◽  
Extreme Weather Events ◽  
Free Living ◽  
Drought Period ◽  
Weather Events

Extreme weather events are projected to increase in frequency and intensity as climate change continues. Heterotrophic bacteria play a critical role in lake ecosystems, yet little research has been done to determine how they are affected by such extremes. The purpose of this study was to use high-throughput sequencing to explore the bacterial community composition of a humic oligotrophic lake on the North Atlantic Irish coast and to assess the impacts on composition dynamics related to extreme weather events. Samples for sequencing were collected from Lough Feeagh on a fortnightly basis from April to November 2018. Filtration was used to separate free-living and particle-associated bacterial communities and amplicon sequencing was performed for the 16S rRNA V4 region. Two named storms, six high discharge events, and one drought period occurred during the sampling period. These events had variable, context-dependent effects on bacterial communities in Lough Feeagh. The particle-associated community was found to be more likely to respond to physical changes, such as mixing, while the free-living population responded to changes in nutrient and carbon concentrations. Generally, however, the high stability of the bacterial community observed in Lough Feeagh suggests that the bacterial community is relatively resilient to extreme weather events.

scholarly journals Bacterial communities associated with individual transparent exopolymer particles (TEP)

2019 ◽  
Vol 41 (4) ◽  
pp. 561-565 ◽  
Author(s):  
Birthe Zäncker ◽  
Anja Engel ◽  
Michael Cunliffe
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dna Sequencing ◽  
Bacterial Communities ◽  
Bacterial Community Composition ◽  
Euphotic Zone ◽  
Carbon Export ◽  
Transparent Exopolymer Particles ◽  
Operational Taxonomic Units ◽  
Insight Into

Abstract Transparent exopolymer particles (TEP) are polysaccharide-rich microgels that are prevalent in the marine environment and have important roles in the aggregation of organic matter and carbon export from the euphotic zone. TEP are readily colonized by bacteria and utilized by specialized taxa, such as Alteromonadaceae. However, bacterial community composition specifically attached to natural TEP remains largely unknown. In this study, we isolated individual TEP from Plymouth Sound (UK) and performed DNA sequencing of the TEP-attached bacterial communities. We also sampled the cognate bulk seawater total bacterial communities for comparison. The bacterial communities associated with individual TEP showed distinct differences compared to the total bulk bacterioplankton communities, with Alteromonadaceae significantly more abundant on TEP. The TEP-associated Alteromonadaceae consisted of two operational taxonomic units that were closely related to Marinobacter and Glaciecola, both previously associated with biogenic aggregates and microgel-rich habitats. This study provides novel insight into marine bacterial–microgel interactions.

scholarly journals Small tropical islands with dense human population: Differences in water quality of near-shore waters are associated with distinct bacterial communities

2018 ◽  
Author(s):  
Hauke Kegler ◽  
Christiane Hassenrueck ◽  
Pia Kegler ◽  
Tim C Jennerjahn ◽  
Muhammad Lukman ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Coral Reef ◽  
Bacterial Community ◽  
Water Column ◽  
Community Composition ◽  
Bacterial Communities ◽  
Bacterial Community Composition ◽  
Back Reef ◽  
Anthropogenic Inputs

Water quality deterioration caused by an enrichment in inorganic and organic matter due to anthropogenic inputs is one of the major local threats to coral reefs in Indonesia. However, even though bacteria are important mediators in coral reef ecosystems, little is known about the response of individual taxa and whole bacterial communities to these anthropogenic inputs. The present study is the first to investigate how bacterial community composition responds to small-scale changes in water quality in several coral reef habitats of the Spermonde Archipelago including the water column, particles and back reef sediments, on a densely populated and an uninhabited island. The main aims were to elucidate if a) water quality indicators and organic matter concentrations differ between the uninhabited and the densely populated island of the archipelago, and b) if there are differences in bacterial community composition in back-reef sediments and in the water column, which are associated with differences in water quality. Several key water quality parameters, such as inorganic nitrate and phosphate, chlorophyll a, and transparent exopolymer particles (TEP) were significantly higher at the inhabited than at the uninhabited island. Bacterial communities in sediments and particle attached communities were significantly different between the two islands with bacterial taxa commonly associated with nutrient and organic matter rich conditions occurring in higher proportions at the inhabited island. Within the individual reef habitats, variations in bacterial community composition between the islands are associated with differences in water quality. We also observed that copiotrophic, opportunistic bacterial taxa were enriched at the inhabited island with its higher chlorophyll a, dissolved organic carbon (DOC) and TEP concentrations. Given the increasing strain on tropical coastal ecosystems, this study suggests that effluents from densely populated islands lacking sewage treatment can alter bacterial communities that may be important for coral reef ecosystem function.

scholarly journals Abiotic environmental factors override phytoplankton succession in shaping both free-living and attached bacterial communities in a highland lake

AMB Express ◽  
2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Huan Wang ◽  
Rong Zhu ◽  
Xiaolin Zhang ◽  
Yun Li ◽  
Leyi Ni ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Bacterial Community ◽  
Species Composition ◽  
Community Composition ◽  
Bacterial Communities ◽  
Phytoplankton Community ◽  
Bacterial Community Composition ◽  
Free Living ◽  
The Impact ◽  
Abiotic Environmental Factors

Abstract Bacterial communities are an important part of biological diversity and biogeochemical cycling in aquatic ecosystems. In this study, the relationship amongst the phytoplankton species composition and abiotic environmental factors on seasonal changes in the community composition of free-living and attached bacteria in Lake Erhai were studied. Using Illumina high-throughput sequencing, we found that the impact of environmental factors on both the free-living and attached bacterial community composition was greater than that of the phytoplankton community, amongst which total phosphorus, Secchi disk, water temperature, dissolved oxygen and conductivity strongly influenced bacterial community composition. Microcystis blooms associated with subdominant Psephonema occurred during the summer and autumn, and Fragilaria, Melosira and Mougeotia were found at high densities in the other seasons. Only small numbers of algal species-specific bacteria, including Xanthomonadaceae (Proteobacteria) and Alcaligenaceae (Betaproteobacteria), were tightly coupled to Microcystis and Psephonema during Microcystis blooms. Redundancy analysis showed that although the composition of the bacterial communities was controlled by species composition mediated by changes in phytoplankton communities and abiotic environmental factors, the impact of the abiotic environment on both free-living and attached bacterial community compositions were greater than the impact of the phytoplankton community. These results suggest that the species composition of both free-living and attached bacterial communities are affected by abiotic environmental factors, even when under strong control by biotic factors, particularly dominant genera of Microcystis and Psephonema during algal blooms.

scholarly journals Temporal Dynamics of Bacterial Communities in a Pilot-Scale Vermireactor Fed with Distilled Grape Marc

2020 ◽  
Vol 8 (5) ◽  
pp. 642 ◽  
Author(s):  
María Gómez-Brandón ◽  
Manuel Aira ◽  
Natielo Santana ◽  
Marcos Pérez-Losada ◽  
Jorge Domínguez
Keyword(s):  
Bacterial Community ◽  
Bacterial Communities ◽  
High Throughput Sequencing ◽  
Temporal Dynamics ◽  
Bacterial Community Composition ◽  
Active Phase ◽  
Acid Synthesis ◽  
Pilot Scale ◽  
Functional Changes ◽  
Grape Marc

Vermicomposting has been found as a profitable approach to dispose of and treat large quantities of raw grape marc. However, less information is available with regard to its efficiency for treating distillery winery byproducts, even though distillation has been widely used as a way to economically valorize grape marc. As such, we sought to characterize the compositional and functional changes in bacterial communities during vermicomposting of distilled grape marc by using 16S rRNA high-throughput sequencing. Samples were collected at the initiation of vermicomposting and at days 14, 21, 28, 35 and 42. There were significant changes (p < 0.0001) in the bacterial community composition of distilled grape marc after 14 days of vermicomposting that were accompanied by twofold increases in bacterial richness and diversity from a taxonomic and phylogenetic perspective. This was followed by significant increases in functional diversity of the bacterial community, including metabolic capacity, lignin and cellulose metabolism, and salicylic acid synthesis. These findings indicate that the most striking compositional and functional bacterial community changes took place during the active phase of the process. They also pinpoint functional attributes that may be related to the potential beneficial effects of distilled grape marc vermicompost when applied on soil and plants.

scholarly journals Temporal dynamics in the free-living bacterial community composition in the coastal North Sea

2012 ◽  
Vol 83 (2) ◽  
pp. 413-424 ◽  
Author(s):  
Eva Sintes ◽  
Harry Witte ◽  
Karen Stodderegger ◽  
Paul Steiner ◽  
Gerhard J. Herndl
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
North Sea ◽  
Temporal Dynamics ◽  
Bacterial Community Composition ◽  
Free Living
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