scholarly journals Longitudinal changes in bacterial community composition in river epilithic biofilms: influence of nutrients and organic matter

2009 ◽  
Vol 54 ◽  
pp. 135-152 ◽  
Author(s):  
Y Kobayashi ◽  
C Kim ◽  
C Yoshimizu ◽  
A Kohzu ◽  
I Tayasu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Longitudinal Changes ◽  
Epilithic Biofilms

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 Experimental insights into the importance of aquatic bacterial community composition to the degradation of dissolved organic matter

2015 ◽  
Vol 10 (3) ◽  
pp. 533-545 ◽  
Author(s):  
Jürg B Logue ◽  
Colin A Stedmon ◽  
Anne M Kellerman ◽  
Nikoline J Nielsen ◽  
Anders F Andersson ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Community Composition ◽  
Bacterial Community Composition

scholarly journals Bacterial Community Composition and Chromophoric Dissolved Organic Matter Differs with Culture Time of Skeletonema dohrnii

Diversity ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 150
Author(s):  
Yang Liu ◽  
Jinjun Kan ◽  
Jing Yang ◽  
Md Abu Noman ◽  
Jun Sun
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Community Composition ◽  
Relative Abundance ◽  
Bacterial Community Composition ◽  
Algal Growth ◽  
Chromophoric Dissolved Organic Matter ◽  
Bacterial Phyla ◽  
Culture Time

Skeletonema dohrnii is a common red tide microalgae occurring in the coastal waters and throughout the world. The associated heterotrophic or autotrophic bacteria play vital roles in regulating algal growth, production, and physiology. In this study, we investigated the detailed bacterial community structure associated with the growth of S. dohrnii’s using high-throughput sequencing-based on 16S rDNA. Our results demonstrated that Bacteroidetes (48.04%) and Proteobacteria (40.66%) in all samples accounted for the majority of bacterial populations. There was a significant linear regression relationship between the abundance of bacterial phyla and culture time. Notable shifts in bacterial community composition were observed during algal growth: Flavobacteriales accounted for the vast majority of sequences at the order level. Furthermore, the relative abundance of Rhodobacterales was gradually reduced during the whole growth process of S. dohrnii (0–12 days). However, beyond that, the relative abundance of Marinobacter was slowly increasing. It is noteworthy that five fluorophores (Peaks T1, T2, I, M, and A) were detected during the growth stage of S. dohrnii. The characteristic indexes (fluorescence index, humification index, and biological index) of chromophoric dissolved organic matter (CDOM) also varied with the culture time. In addition, the taxa of bacteria had certain effects on CDOM and they were inextricably linked to each other.

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