Temporal shifts in cyanobacterial communities at different sites on the Nakdong River in Korea

Hur, Moonsuk; Lee, Injung; Tak, Bo-Mi; Lee, Hae Jin; Yu, Jae Jeong; Cheon, Se Uk; Kim, Bong Soo

doi:10.1016/j.watres.2013.09.058

Cited by 40 publications

(30 citation statements)

References 35 publications

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“…Sequence reads were analyzed as previously described (Hur et al, 2013). Briefly, both the proximal and distal primers were trimmed from demultiplexed sequence reads.…”

Section: Methodsmentioning

confidence: 99%

Assessment of fecal bacterial diversity among healthy piglets during the weaning transition

Pajarillo

Chae

Balolong

et al. 2014

J. Gen. Appl. Microbiol.

160

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The high level of genetic diversity in the microflora of the gastrointestinal tract has the potential to provide numerous beneficial functions to the host. Thus it is now acknowledged that the complexity in animal functioning is linked to the interacting microbiome in the gut. Despite the importance of gut microbiome, there is a lack of information concerning the microbial communities in the pig gut during the weaning transition. This study describes the fecal microbial shifts of healthy piglets during the weaning transition using barcoded pyrosequencing of the prokaryotic 16S rRNA gene. Fecal samples were obtained from 15 piglets during the pre-weaning period (fourth week after birth) and post-weaning (sixth week after birth) and were subjected to community genomic DNA extraction for pyrosequencing analysis. As the piglets underwent the weaning transition a trend toward increased bacterial diversity was observed, based on species abundance as measured by the Shannon-Weaver index. Firmicutes (54.0%) and Bacteroidetes (59.6%) were the most dominant phyla during pre-weaning and post-weaning, respectively. During the weaning transition a distinct shift from Bacteroides to Prevotella as the most abundant genus was observed. Additionally, we detected a number of abundant gut bacterial species that have not been reported previously. Clostridium rectum, C. clostridioforme, C. lactatifermentans and Butyricimonas virosa were uniquely detected prior to weaning while Roseburia cecicola and Blautia wexlerae were detected during the post-weaning period only.

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“…Sequence reads were analyzed as previously described (Hur et al, 2013). Briefly, both the proximal and distal primers were trimmed from demultiplexed sequence reads.…”

Section: Methodsmentioning

confidence: 99%

Assessment of fecal bacterial diversity among healthy piglets during the weaning transition

Pajarillo

Chae

Balolong

et al. 2014

J. Gen. Appl. Microbiol.

160

View full text Add to dashboard Cite

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“…This pattern indicates as nutrient level increases the summer blooms dominates the annual phytoplankton production in midriver stations. Cyanobacteria, including Microcystis , Aphanizomenon , Anabaena , are known as dominant genera in the river during summer [ Ha et al ., ; Hur et al ., ]. In stations 8 and 9, the summer Chl a peak collapsed and the transition to the winter peak (January to February) occurred in stations 10–16.…”

Section: Discussionmentioning

confidence: 99%

ABayesian hierarchical approach to model seasonal algal variability along an upstream to downstream river gradient

Cha

Park

Lee

et al. 2016

Water Resources Research

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Modeling to accurately predict river phytoplankton distribution and abundance is important in water quality and resource management. Nevertheless, the complex nature of eutrophication processes in highly connected river systems makes the task challenging. To model dynamics of river phytoplankton, represented by chlorophyll a (Chl a) concentration, we propose a Bayesian hierarchical model that explicitly accommodates seasonality and upstream-downstream spatial gradient in the structure. The utility of our model is demonstrated with an application to the Nakdong River (South Korea), which is a eutrophic, intensively regulated river, but functions as an irreplaceable water source for more than 13 million people. Chl a is modeled with two manageable factors, river flow, and total phosphorus (TP) concentration. Our model results highlight the importance of taking seasonal and spatial context into account when describing flow regimes and phosphorus delivery in rivers. A contrasting positive Chl a-flow relationship across stations versus negative Chl a-flow slopes that arose when Chl a was modeled on a station-month basis is an illustration of Simpson's paradox, which necessitates modeling Chl a-flow relationships decomposed into seasonal and spatial components. Similar Chl a-TP slopes among stations and months suggest that, with the flow effect removed, positive TP effects on Chl a are uniform regardless of the season and station in the river. Our model prediction successfully captured the shift in the spatial and monthly patterns of Chl a.

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“…Fluctuations in the phytoplankton communities due to dam discharge have also been reported [33]. Recently, the effects of sampling periods and environmental factors on cyanobacterial communities at 6 sites along the Nakdong River were investigated in detail [34]. High-throughput sequencing of cyanobacterial 16S rRNA revealed a total of 175 cyanobacterial genera where cyanobacterial communities varied from June to September.…”

Section: Field Studies Regarding Cyanobacterial Blooms In South Koreamentioning

confidence: 99%

Status, Alert System, and Prediction of Cyanobacterial Bloom in South Korea

Srivastava

Ahn

Asthana

et al. 2015

BioMed Research International

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Bloom-forming freshwater cyanobacterial genera pose a major ecological problem due to their ability to produce toxins and other bioactive compounds, which can have important implications in illnesses of humans and livestock. Cyanobacteria such as Microcystis, Anabaena, Oscillatoria, Phormidium, and Aphanizomenon species producing microcystins and anatoxin-a have been predominantly documented from most South Korean lakes and reservoirs. With the increase in frequency of such blooms, various monitoring approaches, treatment processes, and prediction models have been developed in due course. In this paper we review the field studies and current knowledge on toxin producing cyanobacterial species and ecological variables that regulate toxin production and bloom formation in major rivers (Han, Geum, Nakdong, and Yeongsan) and reservoirs in South Korea. In addition, development of new, fast, and high-throughput techniques for effective monitoring is also discussed with cyanobacterial bloom advisory practices, current management strategies, and their implications in South Korean freshwater bodies.

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Temporal shifts in cyanobacterial communities at different sites on the Nakdong River in Korea

Cited by 40 publications

References 35 publications

Assessment of fecal bacterial diversity among healthy piglets during the weaning transition

Assessment of fecal bacterial diversity among healthy piglets during the weaning transition

ABayesian hierarchical approach to model seasonal algal variability along an upstream to downstream river gradient

Status, Alert System, and Prediction of Cyanobacterial Bloom in South Korea

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