Occurrence and Succession Pattern of Cyanobacteria in the Upper Region of the Nakdong River : Factors Influencing Aphanizomenon Bloom

Ryu, Hui-Seong; Park, Hae-Kyung; Lee, Hae-Jin; Shin, Ra-Young; Cheon, Se-Uk

doi:10.15681/kswe.2016.32.1.52

Cited by 18 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A. flos-aquae is known to be the Aphanizomenon species blooming in the mainstream of the Nakdong River during spring and autumn [ 8 , 9 ]. Thus, the ten Aphanizomenon isolates, which were identified as A. flos-aquae by morphological and phylogenetic analysis, were confirmed as the Aphanizomenon species causing cyanoHAB in the Nakdong River.…”

Section: Discussionmentioning

confidence: 99%

“…However, large cities as well as various agricultural industrial complexes in the basin have polluted the Nakdong River, and there have been reports of cyanoHAB in the downstream section of the Nakdong River since the 1990s [ 6 , 7 ]. After the construction of the eight weirs along the river in 2012, there has been cyanoHAB formation every summer [ 8 , 9 ]. In addition, cyanoHAB, which has been known to only occur during seasons with high water temperature, was recently observed to persist even during the winter, and the nostocalean cyanobacteria, Aphanizomenon spp., were the most dominant [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence of the Aphanizomenon spp. cyanoHAB, which has the potential to produce harmful substances such as cyanobacterial toxins or off-flavor metabolites, in drinking water sources such as the Nakdong River [ 8 , 9 , 10 ], does not only call for an urgent response but also call for the critical verification of the harmful substances-producing potential of cyanoHAB-causing cyanobacteria. However, the identity of toxin producers can only be confirmed by isolating and identifying strains and by analytically confirming the presence of both the harmful metabolites and the genetic identity of the monoculture [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molecular Verification of Bloom-forming Aphanizomenon flos-aquae and Their Secondary Metabolites in the Nakdong River

Park

Kwon

Lee

et al. 2018

IJERPH

Self Cite

View full text Add to dashboard Cite

Aphanizomenon spp. have formed harmful cyanobacterial blooms in the Nakdong River during spring, autumn, and now in winter, and the expansion of blooming period and area, associated with the global warming is predicted. The genus Aphanizomenon has been described to produce harmful secondary metabolites such as off-flavors and cyanotoxins. Therefore, the production of harmful secondary metabolites from the Aphanizomenon blooms in the Nakdong River needs to be monitored to minimize the risk to both water quality and public health. Here, we sampled the cyanobacterial blooms in the Nakdong River and isolated ten Aphanizomenon strains, morphologically classified as Aphanizomenon flos-aquae Ralfs ex Bornet et Flahault 1888. Phylogenetic analysis using 16S rRNA and internal transcribed spacer (ITS) region nucleotide sequences confirmed this classification. We further verified the harmful secondary metabolites-producing potential of A. flos-aquae isolates and water samples containing cyanobacterial blooms using PCR with specific primer sets for genes involved in biosynthesis of off-flavor metabolites (geosmin) and toxins (microcystins, saxitoxins and cylindrospermopsins). It was confirmed that these metabolite biosynthesis genes were not identified in all isolates and water samples containing only Aphanizomenon spp. Thus, it is likely that there is a low potential for the production of off-flavor metabolites and cyanotoxins in Aphanizomenon blooms in the Nakdong River.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular Verification of Bloom-forming Aphanizomenon flos-aquae and Their Secondary Metabolites in the Nakdong River

Park

Kwon

Lee

et al. 2018

IJERPH

Self Cite

View full text Add to dashboard Cite

show abstract

“…8; John et al 2002, p. 96, pl. 18g-j;Rajanieimi et al 2005b, Fig This species was common in Asian freshwater not only in South Korea (Park et al 2015;Ryu et al 2016) but also in China (Wu et al 2010;Ma et al 2015) and in Japan (Takano and Hino 2009;Yamamoto 2009). Studied samples were collected from all stations.…”

Section: Morphology and Taxonomy Of Individual Speciesmentioning

confidence: 95%

“…After the construction of eight weirs, the number of its bloom has been recently growing in mid-upperstream (Ryu et al 2016). Nevertheless, two Aphanizomenon floras (Aph.…”

Section: Introductionmentioning

confidence: 99%

Morphology and taxonomy of the Aphanizomenon spp. (Cyanophyceae) and related species in the Nakdong River, South Korea

2016

View full text Add to dashboard Cite

Background: The purpose of this study is to describe the morphological characteristics of the Aphanizomenon spp. and related species from the natural samples collected in the Nakdong River of South Korea. Aph. flos-aquae was similar to Aph. klebahnii, whereas these species differed from each other by the size and shape of fascicles, which was macroscopic in Aph. flos-aquae and microscopic in the Aph. klebahnii. One of their characteristics was that trichomes are easily disintegrating during microscopic examination. C. issatschenkoi could be clearly distinguished from other species by hair-shaped terminal cell. Its terminal cell was almost hyaline and markedly pointed. Young populations of the species without heterocytes run a risk of a misidentification. Aph. skujae was characterized by akinete. Morphological variability of akinetes from natural samples collected in the Nakdong River was rather smaller than those reported by previous study. Conclusions: C. issatschenkoi are described for the first time in the Nakdong River. In addition, Aph. klebahnii and Aph. skujae are new to South Korea.

show abstract

Determination of sensitive variables regardless of hydrological alteration in artificial neural network model of chlorophyll a: Case study of Nakdong River

Kim

Hong

Jeong³

et al. 2019

Ecological Modelling

View full text Add to dashboard Cite

Occurrence and Succession Pattern of Cyanobacteria in the Upper Region of the Nakdong River : Factors Influencing Aphanizomenon Bloom

Cited by 18 publications

References 12 publications

Molecular Verification of Bloom-forming Aphanizomenon flos-aquae and Their Secondary Metabolites in the Nakdong River

Molecular Verification of Bloom-forming Aphanizomenon flos-aquae and Their Secondary Metabolites in the Nakdong River

Morphology and taxonomy of the Aphanizomenon spp. (Cyanophyceae) and related species in the Nakdong River, South Korea

Determination of sensitive variables regardless of hydrological alteration in artificial neural network model of chlorophyll a: Case study of Nakdong River

Contact Info

Product

Resources

About