KCI등재
옥정호의 육수생물학적 연구 = Limno Biological Investigation of Lake Ok - Jeong
저자
안형호 (부산수산대학 대학원 수산생물학과)
발행기관
학술지명
권호사항
발행연도
1982
작성언어
Korean
KDC
529
등재정보
KCI등재
자료형태
학술저널
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1-25(25쪽)
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Limnological study on the physico-chemical properties and biological characteristics of the Lake Ok-jeong was made from May 1980 to August 1981. For the planktonic organisms in the lake, species composition, seasonal change and diurnal vertical distribution based on the monthly plankton samples were investigated in conjunction with the physico-chemical properties of the body of water in the lake.
Analysis of temperature revealed that there were three distinctive periods in terms of vertical mixing of the water column. During the winter season (November-March) the vertical column was completely mixed, and no temperature gradient was observed. In February temperature of the whole column from the surface to the bottom was 3.5��, which was the minimum value. With seasonal warming in spring, surface water forms thermoclines at the depth of 0-10m from April to June. In summer (July-October) the surface mixing layer was deepened to form a strong thermocline at the depth of 15-25 m. At this time surface water reached up to 28.2�� in August, accompanied by a significant increase in the temperature of bottom layer. Maximum bottom temperature was r5�� which occurred in September, thus showing that this lake keeps a significant turbulence Aehgh the hypolimnial layer. As autumn cooling proceeded summer stratification was destroyed from the end of October resulting in vertical mixing.
In surface layer seasonal changes of pH were within the range from 6.8 in January to 9.0 in guutuost. Thighest value observed in August was mainly due to the photosynthetic activity of the phytoplankton.
In the surface layer DO was always saturated throughout the year. Particularly in winter (January-April) the surface water was oversaturated (Max. 15.2 ppm in March). Vertical variation of DO was not remarkable, and bottom water was fairly well oxygenated.
Transparency was closely related to the phytoplankton bloom. The highest value (4.6m) was recorded in February when the primary production was low. During summer transparency decreased hand the lowest value (0.9m) was recorded in August. It is mainly due to the dense blooming of gnabaena spiroides var. crassa in the surface layer.
A. The amount of inorganic matters (Ca, Mg, Fe) reveals that Lake Ok-Jeong is classified as a soft-water lake. The amount of Cl, NO_3-N and COD in 1981 was slightly higher than those in 1980. Heavy metals (Zn, Cu, Pb Cd and Hg) were not detectable throughout the study period.
During the study period 107 species of planktonic organisms representing 72 genera were idetified. They include 12 species of Cyanophyta, 19 species of Bacillariphyta, 23 species of Chlorphyta, 14 species of Protozoa, 29 species of Rotifera, 4 species of Cladocera and 6 species of Copedoda.
Bimodal blooming of phytoplankton was observed. A large blooming (1,504�~10^3 cells/l in October) was observed from July to October; a small blooming was present (236�~10^3 cells/l in February) from January to April.
The dominant phytoplankton species include Mglosira gramulata, Anabaena spiroides, Asterionella gracillima and Microchstis aeruginosa, which were classified into three seasonal groups: summer group, winter group and the whole year group. The summer group includes Melosira granulata and Anabaena spiroides; the winter group includes Asteronella gracillima and synedra acus, S. ulna; the whole year group includes Microsystis aeruginosa and Ankistrodesmus fatcatus. It noted that M. granulata tends to aggregate in the bottom layer from January to August.
The dominant zooplankters were Thermocylops taihokuensis, Difflugia corona, Bosmina longirostris, Bosminopsis deitersi, Keratella quadrata and Asplanchna priodnta. A single peak of zooplankton growth was observed and maximum zooplankton occurrence was present in July.
Diurnal vertical migration was revealed by Microcystis aeruginosa, M. incerta, Anabaena spiroides, Melosira granulata, and Bosmina longirostris. Of these, M. granulata descends to the bottom and forms aggregation after sunset. B. longirostris shows fairly typical nocturnal migration. They ascends to the surface after sunset and disperse in the whole water column during night.
Fourty one species of fish representing 31 genera were collected. Of these 13 species including Pseudoperilampus uyekii and Coreoleuciscus splendidus were indigenous species of Korean inland waters.
The indicator species of water quality determination include Microcystis aeruginosa, Melosira granulata, Asterinella gracillima, Brachionus calyciflorus, Filinia longiseta, Conochiloides natans, Asplanchna deitersi, Heliodiaptomus kikuchii and Thermocyclops taihokuensis. These species have been known the indicator groups which are commonly found in the eutrophic lakes. Basede on planktonic indicators Lake Ok-Jeong can be classified into an eutrophic lake.
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