중파 자외선에 노출된 남극 규조 Chaetoceros neogracile와 Stellarima microtrias의 성장과 질산염 흡수량의 변화
KCI
OTHER
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Title
- 중파 자외선에 노출된 남극 규조 Chaetoceros neogracile와 Stellarima microtrias의 성장과 질산염 흡수량의 변화
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Alternative Title
- UV-B Effects on Growth and Nitrate Dynamics in Antarctic Marine Diatoms Chaetoceros neogracile and Stellarima microtrias
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Author(s)
- 강재신; 강성호; 이윤호; 심정희; 이상훈
- KIOST Author(s)
- Lee, Youn Ho(이윤호)
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Alternative Author(s)
- 강재신; 강성호; 이윤호; 심정희; 이상훈
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Publication Year
- 2003-03
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Abstract
- Two isolated Antarctic marine diatoms, Chaetoceros neogracile VanLandingham and Stellarima microtrias (Ehrenberg) Hasle and Sims were examined to show changes of growth and uptake rate of nitrate due to UV-B irradiance. Chlorophyll (chl) a concentration was regarded as the growth index of diatom. The diatoms were treated with UV-B radiation and cultured for 4 days under cool-white fluorescent light without UV-B radiation. Two levels of UV-B exposures were applies: 1 and 6 W m−2. Durations of UV-B treatment were 20, 40 and 60 minutes under 6 W m−2 and 1, 2, 3, 4 and 5 hrs under 1 W m−2. The control groups were cultured at the same time without UV-B radiation. The growth rates of two diatoms decreased under 1 and 6 W m−2 UV-B irradiances than that of control group. After 4 days, chl a concentrations of C. neogracile were increased more than 4 times from 133 μgol−1 to 632 μgol−1 in control group. However, the concentration of experimental groups under 1 W m−2 UV-B were only increased from 139 μgol−1 to 421 μgol−1 during one hour and the chl a concentrations were decreased from 144 μgol−1 to 108 μgol−1 during five hour. Growth of diatom dramatically more decreased under 6 W m−2 UV-B than 1 W m−2 UV-B. The chl a concentration of experimental groups under 6 W m−2 UV-B for one hour was only increased from 111 μgol−1 to 122 μgol−1. In the case of S. microtrias showed also similar pattern to C. neogracile by UV-B radiation. The uptake rates of nitrate by the two strains were decreased abruptly under 6 W m−2 UV-B irradiances. When two strains were treated under 1 and 6 W m−2 UV-B during one hour, the strains were only continued growth and uptake of nitrate under 1 W m−2 UV-B. This experimental evidence shows that exposure to UV-B radiation especially to high irradiance of UV-B decreases diatom survival and causes lower decrease of nutrient concentrations by microalgae in Antarctic water. Furthermore, evidence suggests that microalgal communities confined to near-surface waters in Antarctica will be harmed by increased UV-B radiation, thereby altering the dynamics of Antarctic marine ecosystems.
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ISSN
- 1226-2617
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/40525
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DOI
- 10.4490/ALGAE.2003.18.1.013
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Bibliographic Citation
- ALGAE, v.18, no.1, pp.13 - 20, 2003
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Publisher
- 한국조류학회I
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Keywords
- Antarctic diatoms; Chaetoceros neogracile; chlorophyll a; growth and nitrate dynamics; Stellarima microtrias; UV-B
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Type
- Article
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Language
- Korean
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