A Study on the Freshwater Algal Flora Occurring in Temporary Ponds around the Dasan Arctic Station, Ny-Alesund (Norway), and the Molecular Characteristics of Chlamydomonas 18S rDNA

기장서,; 강성호,; 정승원,; 박범수,; 한명수,

doi:10.4217/opr.2006.28.2.107

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…C. ovata and Chlamydomonas sp. tolerate low temperatures (Arvola et al 1991;Han et al 2002;Ki et al 2006) and are frequently found in eutrophic waters (Lessmann et al 2003). N. subminuscula, which is an important bio-indicator of eutrophicated water, also possess this tolerance (Gómez and Licursi 2001).…”

Section: Discussionmentioning

confidence: 98%

Testing addition of Pseudomonas fluorescens HYK0210-SK09 to mitigate blooms of the diatom Stephanodiscus hantzschii in small- and large-scale mesocosms

et al. 2009

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An algicidal bacterium Pseudomonas fluorescens HYK0210-SK09 (SK09) was applied to a natural bloom of Stephanodiscus hantzschii using a small-scale mesocosm (SM) and a large-scale mesocosm (LM) to clarify the algicidal effects and evaluate the response of the planktonic community and environments. When SK09 cells were inoculated at a final concentration of 5×10 6 cells mL −1 , the abundance of S. hantzschii decreased significantly by 95% in SM and 85% in LM. The microcosm in the laboratory revealed that the abundance of Pseudomonas increased rapidly after inoculation with a corresponding decrease in the S. hantzschii population. Nutrient concentrations increased following the decline in the diatom cells. The abundances of nondominant species such as Chlamydomonas, Cryptomonas, and Navicula increased slightly with increased nutrient concentrations. The abundance of heterotrophic protists also increased significantly due to utilization of SK09 as food. The present study demonstrates that SK09 is an effective biocontrol agent for natural S. hantzschii bloom, and grazing pressure plays a crucial role in the successful application of algicidal bacteria to natural environments.

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Section: Discussionmentioning

confidence: 98%

Testing addition of Pseudomonas fluorescens HYK0210-SK09 to mitigate blooms of the diatom Stephanodiscus hantzschii in small- and large-scale mesocosms

et al. 2009

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“…For example, this species was previously reported to be in the ponds of Svalbard during the summer (Ki et al 2006). Additionally, this species was also found in the lake sediment records of Svalbard (Jones a~orresponding authors: Sung-Ho Kang (shkang@korpi.re.kr) and Myung-Soo Han (hanms@anyang.ac.kr) and .…”

Section: Introductionmentioning

confidence: 90%

“…For example, D. tenue was described as a halophilic phytoplankter by Tuchman et al (1984). In contrast, Bothwell (1989) (Ki et al 2006). A portion of the sample was inoculated into DM media (Kang et al 2005) and incubated at 10°C for one week under a 12:12 hour 1ight:dark cycle with a light intensity of approximately 50 pE m-2 S-I.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature and Salinity on the Growth and the Optimum Nitrogen to Phosphorus Ratio for the Culture ofDiatoma tenueIsolated from a Temporary Arctic Pond in Svalbard, Norway

Katano

Lee

et al. 2007

Journal of Freshwater Ecology

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We investigated the effects of temperature and salinity on the growth of Diatoma tenue isolated from a temporary arctic pond in a high-latitude region of Svalbard, Norway. We also examined the optimum nitrogen to phosphorus (N:P) ratio of the culture media. The highest growth rate (0.38 day") of D. tenue was achieved at 1 5'C, while growth was completely inhibited above 20°C. D. tenue could not grow when cultured at above 5%0 salinity. The final cell density of D. tenue was increased with an increasing phosphate concentration in the culture media from 0 to 5 pmol P L'. The final cell density became stable at above 5 pmol P I;' . The N:P molar ratio of the media containing 5 pmol P L-' was 34.8. These results show that D. tenue growth is limited by phosphorus at N:P ratios greater than 34.8, with a nitrogen limitation below 34.8. This finding indicates that this alga has a higher optimum N:P ratio than the Redfield ratio of 16.

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“…August 2005 ( Ki et al 2006). A portion of the sample was inoculated into C medium (Watanabe 2000) and incubated at 10'C for one week under a 12: 12 hour 1ight:dark cycle with a light intensity of approximately 50 pmol photons m-2 i'.…”

Section: Methodsmentioning

confidence: 99%

Effect of Temperature on Inorganic Carbon Acquisition ofChlamydomonas reinhardtii

Katano¹,

Lee²,

Lee³

et al. 2009

Journal of Freshwater Ecology

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Carbon dioxide availability for microalgae in aquatic environments increases with decreasing water temperature, while photosynthetic activity generally decreases. Therefore, inorganic carbon acquisition by algal cells is greatly affected by temperature. We investigated half-saturation constants [Krn(DIC), Km(C02)] of inorganic carbon in photosynthesis under various temperatures for a strain of Chlamydomonas reinhadtii. C. reinhardtii showed an active carbon concentrating mechanism (CCM) at all temperature conditions investigated (5 -25'C), implying that CCM activity is not diminished at low temperatures. The maximum photosynthetic rate was recorded at 15'C, while maximum CCM activity was detected at 2022. A higher optimum temperature for CCM activity than for photosynthesis may compensate for lower photosynthetic rates above the optimum temperature. CCM may play a more significant role at higher temperatures in algal photosynthesis in aquatic environments. INTRODUCTIONMany microalgae, including cyanobacteria, possess a carbon-concentrating mechanism (CCM) to elevate C02 concentrations around the COrfixing enzyme of ribulose-1, 5-bisphosphate carboxylase/oxygenase (RUBISCO), which has a relatively low affinity for C02 in ambient air (Kaplan and Reinhold 1999, Giordano et al. 2005). The CCM is generally activated in cells cultured under the ambient C02 level (0.035%) as compared to those grown under high C02 conditions (2-5%). Since the CCM expression requires extra energy (Beardall 1991), CCM activity possibly decreases under severe conditions, such as under low light or low temperature. Indeed, Beardall (1991) demonstrated that CCM in the cyanobacterium Anabaena variabilis is suppressed when cells were cultured under low amounts of light. In contrast, information on CCM activity in microalgae under low water temperature is relatively limited.Under low temperature, C02 availability for microalgae tends to increase due to higher solubility. On the other hand, photosynthetic activity is generally low at lower temperatures. Therefore, the need for the active transport of DIC to maintain the supply of C02 to the RUBISCO active site may decrease under low temperatures. Indeed, the carbon isotope ratio, which indicates carbon fractionation in photosynthesis, is lower in polar microalgae, suggesting lower CCM activity in the polar region (Rau et al. 1989). In contrast, an increase in water temperature leads a decrease in C02 solubility and increase in photosynthetic activity until reaching an optimum temperature. Near the optimum temperature for photosynthesis, CCM activity may strongly affect the photosynthetic rate.

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A Study on the Freshwater Algal Flora Occurring in Temporary Ponds around the Dasan Arctic Station, Ny-Alesund (Norway), and the Molecular Characteristics of Chlamydomonas 18S rDNA

Cited by 7 publications

References 21 publications

Testing addition of Pseudomonas fluorescens HYK0210-SK09 to mitigate blooms of the diatom Stephanodiscus hantzschii in small- and large-scale mesocosms

Testing addition of Pseudomonas fluorescens HYK0210-SK09 to mitigate blooms of the diatom Stephanodiscus hantzschii in small- and large-scale mesocosms

Effects of Temperature and Salinity on the Growth and the Optimum Nitrogen to Phosphorus Ratio for the Culture ofDiatoma tenueIsolated from a Temporary Arctic Pond in Svalbard, Norway

Effect of Temperature on Inorganic Carbon Acquisition ofChlamydomonas reinhardtii

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