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대형 인공댐호이 효율적 수질 감시를 위한 적정 조사 빈도 설정 연구
안광국,홍욱희,최신석 ( Kwang Guk An,Wuk Hee Hong,Shin Suk Choi ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.3
In water quality monitoring practices, frequent water sampling would promise data accuracy but may not be so cost effective. However, less frequent sampling would fail to provide accurate data which represents the exact quality of the water body. Hence, determining appropriate sampling frequencies will be enormously important in terms of data accuracy and cost saving, particularly when the sampled water bodies are of great importance as major water resources . In this study, such determination of sampling frequencies was carried out for the Lake Taechung. Total 13 water quality parameters sampled and analyzed every 2 to 3 days for a year were compared with the data sampled less frequently; once every 7 to 10 days, twice a month, and once a month. While general water quality parameters such as dissolved oxygen, pH, and turbidity were dynamically fluctuated throughout the year, the parameters related to the trophic state such as Secchi depths, total suspended solids, nutrients, and chlorophyll-a showed more distinctive fluctuations during the algal growth season. The effects of summer monsoon were remarkable in most water quality parameters. Based on these findings, it was suggested that during the algal growth season, June to September, at least weekly samplings should be carried out for VSS, total nitrogen, total phosphorus and chlorophyll-a. Nitrate- and ammonia-N, dissolved phosphorus, NVSS and other parameters may be measured twice a month during this season. During non-algal growth seasons, from October to May of the next year, bimonthly samplings were suggested for such parameters as total nitrogen, total phosphorus, and chlorophyll-a Monthly samplings would suffice for all other parameters.
한국 (韓國) 특산종 , 감돌고기의 초기발생에 관한 연구
김재구,홍영표,안광국,최신석 ( Jai Ku Kim,Young Pyo Hong,Kwang Guk An,Shin Suk Choi ) 한국하천호수학회 1991 생태와 환경 Vol.24 No.2
Studies on early embryonic development of Pseudopuntungia nigra were carried out. The mature eggs were spherical in shape, adhesive, 2.2∼2.3 mm in diameter and transparently pinkish in color, whereas the immature eggs were irregular in shape, non-adhesive, and embryonic development did not process even if formation of perivitelline spaces appeared in artificial fertilization. Just after fertilization, yolk sac became shrunk and yolk membranes expanded. Therefore, the size of eggs attained approximately to 2.5 mm. Blastodiscs formed in 1 hours and 20 minutes after fertilization, which divided into 2 cells in 2 hours and 5 minutes after fertilization. Between 11 hours and 30 minutes and 18 hours and 30 minutes after fertilization, blastula and gastrula stages occurred in yolk membranes. Embryonic development began from 22 hours and 55 minutes after fertilization. Blood circulation through the pericardiales cavum occurred in 119 hours after fertilization. About 175 hours and 30 minutes after fertilization, thetransparent two-otoliths in auditory vesicles appeared in 175 hours and 30 minutes after fertilization. Egg-hatching occured in yolk membranes mostly between 7 and 9 days after fertilization. Just hatched larvae were measured 6.8 mm on average in total length, which possess over 32 myomeres in notochord. Two days after hatching, air-bladder formed, and appeared melanophores appeared at first in their caudal fin. Seven days after hatching, larvae showed mouth-opening and liver formation. Eighteen days after hatching, pigment pattern of larvae were the same as those of adults except for the anal fin.
崔信錫,洪榮杓,安光國 忠南大學校 環境問題硏究所 1988 環境硏究 Vol.6 No.2
This survey was investigated freshwater fish communities in Sapkyo Stream for four month from May 1986 to August 1987, and classified fish communities, and then analyzed them. The result obtained were as follows: 36 species belonging to 10 family were collected in Sapkyo Stream. There were collected 80% species of total species of freshwater fishes in Korea. Cultriculus eigenmani showed the highest value of relative abundance in Sapkyo Stream. By the partial ordination analysis, with constancy as the range 10% to 60%, the fish communities in Sapkyo Stream were divided into Moroco-Zacco (A), Zacco-Cultriculus (A+B), Pelteobagrus-Cultriculus (B), Acanthogobius-Carassius (C) community. The diversity index, eveness index and species richness index value in Sapkyo Stream were appeared relatively high, but the dominance index value showed low. Fish species of high relative abundance and constancy value in Sapkyo Stream were showed as lake type.
한국산 긴몰개(Squalidus gracilis majime, Cyprinidae)의 난발생
박경서,홍영표,문운기,최신석,안광국 한국육수학회 2005 생태와 환경 Vol.38 No.1
한국산 긴몰개 (Squalidus gracilis majimae)의 난발생 과정을 연구하기 위하여, 긴몰개의 친어와 생태적 조사는 충청남도 보령시에 위치한 보령댐과 웅천천에서 실시하였다. 자연 산란에 의해 수정된 난과 배 발생의 형태학적 설명은 다음과 같이 요약된다. 수정란의 형태는 둥글고, 점착성이 있으며 투명하였고, 수정란의 평균직경은 2.9±0.3 ㎜ (n = 30)였고, 유구가 존재하지 않았으며, 수정란의 발생은 수온 26±1.5℃에서 관찰되었다. 수정 후 20분에 배반이 형성되었으며,48분 뒤 2세포로 나뉘어졌고, 포배기는 수정 후 5시간 40분에 나타났으며, 낭배기는 수정 후 6시간 55분에 관찰되었다. 배체의 형성은 수정 후 12시간 58분부터 시작되었고, 안포와 9개의 체절이 수정 후 17시간 05분에 발견되었다. 수정 후 23시간 30분에 이포가 생겼으며, 25~26개의 체절과 함께 안포안의 렌즈가 수정 후 32시간 35분에 발견되었다. 수정 후 37시간 27분에 뇌의 분화와 함께 배체가 꿈틀거리기 시작했으며, 심장박동과 안포내의 흑색소포가 수정 후 44시간 46분에 발견되었다. 수정 후 50시간 36분 가슴지느러미의 형성과 함께 몸 부분의 흑색소포가 형성되는 것을 끝으로하여 수정 후 57시간 49분에 수정란은 부화되었다. 이때 갓 부화된 자어는 전장이 3.3±0.2 ㎜(n= 120)이었다. 본 연구 결과는 최근 수질오염 및 종 다양성 감소가 시급한 상황에서 종 및 개체군 보존에 기여할 것으로 사료된다. This study was conducted, based on the field survey and laboratory observations, to elucidate egg developmental processes and their characteristics of the Korean slender gudgeon, Squalidus gracilis majimae. For the experiments, the mature adults were collected at the Woongcheon-Cheon Stream and Boreung Reservoir located in Boreung City, Chungnam Province and eggs were obtained from the natural spawning area. Morphological characteristics of the egg and embryonic development were su㎜arized as follows: The shape of the fertilized egg was spherical, adhesive and transparent. The fertilized egg was 2.9±0.3 ㎜ (n = 30) in mean diameter under water temperature of 26 ± 1.5℃, light white in color and had no oil droplets. After 20 minutes from the time of fertilization, a blastodisc was formed and divided into two cells at 48 minutes after fertilization. The blastular stage occurred at 5 hours 40 minutes after fertilization and the gastrular stage was detected at 8 hours 41 minutes after fertilization. The beginning of embryo formation was observed at 12 hours 58 minutes after fertilization and optic vesicles and 9 somites were discovered at 17 hours 05 minutes after fertilization. Differentiation of brains and embryo wiggling were observed at 37 hours 27 minutes after fertilization. Heart beating and the formation of melanophores in optic vesicles were detected at 44 hours 46 minutes after fertilization. The formation of pectoral fins and melanophores in the body were discovered at 50 hours 36 minutes after fertilization. Hatching occurred at 57 hours 49 minutes after fertilization. The newly hatched larvae were 3.3 ±0.2 ㎜ (n = 120) in total length. We believe that these results may contribute the species and population conservations under the situation of accelerated water pollution and the decreases of its diversity.