CO2와 수온 증가에 대한 봄철 저수온기 팔당호식물플랑크톤군집 변화 (Phytoplankton Community Change of Lake Paldang by Increasing CO2 and Temperature during Spring Cold Water Season)

서지정보

· 발행기관 : 한국수생태학회
· 수록지 정보 : 생태와 환경 / 46권 / 4호 / 588 ~ 595페이지
· 저자명 : 이가람, 성은주, 박혜진, 박채홍, 박명환, 황순진

초록

This study investigated the influence of temperature and CO2 increase on phytoplankton growthand community structure during cold water season (spring) in Lake Paldang, Korea. Four experimental treatmentsof temperature and CO2 manipulation were prepared in the laboratory batch culture: (1) Control;ambient low temperature (6±2℃) and low CO2 (air level, 400 mg L-1), (2) T1; low temperature and high CO2(800 mg L-1), (3) T2; high temperature (20±2℃) and low CO2, (4) T3; high temperature and high CO2. Algalgrowth experiment was carried out for 10 days under the light intensity of 70 μmol m-2 s-1 (L :D=24 : 0). Thelevel of pH decreased in both T1 and T3, due to dissolution of added CO2. The dominant phytoplankton speciesof ambient water, Cyclotella meneghiniana succeeded to Fragilaria capucina var. gracilis in high-temperaturetreatment groups (T2 and T3). Cyanobacteria were very rare at the beginning of the experiment, while Oscillatorialimnetica appeared in only high-temperature groups (T2 and T3) at 6~7th day. CO2 addition in ambienttemperature (T1) induced the highest phytoplankton growth, and thereby producing the highest average celldensity of 3.27±0.33 104 cells mL-1, followed by T2 (2.65±0.26 104 cells mL-1), T3 (2.09±0.16 104 cells mL-1),and Control (1.86±0.13 104 cells mL-1) (F=7.167, p=0.000). In summary, temperature increase changed thephytoplankton community structure and CO2 increase promoted the phytoplankton growth during the coldspring season in Lake Paldang, suggesting a potential effect of climate change on freshwater phytoplankton.

영어초록

This study investigated the influence of temperature and CO2 increase on phytoplankton growthand community structure during cold water season (spring) in Lake Paldang, Korea. Four experimental treatmentsof temperature and CO2 manipulation were prepared in the laboratory batch culture: (1) Control;ambient low temperature (6±2℃) and low CO2 (air level, 400 mg L-1), (2) T1; low temperature and high CO2(800 mg L-1), (3) T2; high temperature (20±2℃) and low CO2, (4) T3; high temperature and high CO2. Algalgrowth experiment was carried out for 10 days under the light intensity of 70 μmol m-2 s-1 (L :D=24 : 0). Thelevel of pH decreased in both T1 and T3, due to dissolution of added CO2. The dominant phytoplankton speciesof ambient water, Cyclotella meneghiniana succeeded to Fragilaria capucina var. gracilis in high-temperaturetreatment groups (T2 and T3). Cyanobacteria were very rare at the beginning of the experiment, while Oscillatorialimnetica appeared in only high-temperature groups (T2 and T3) at 6~7th day. CO2 addition in ambienttemperature (T1) induced the highest phytoplankton growth, and thereby producing the highest average celldensity of 3.27±0.33 104 cells mL-1, followed by T2 (2.65±0.26 104 cells mL-1), T3 (2.09±0.16 104 cells mL-1),and Control (1.86±0.13 104 cells mL-1) (F=7.167, p=0.000). In summary, temperature increase changed thephytoplankton community structure and CO2 increase promoted the phytoplankton growth during the coldspring season in Lake Paldang, suggesting a potential effect of climate change on freshwater phytoplankton.

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