This study was conducted to investigate whether the presence of mcy gene and microcystin production are related to morphological characteristics of Korean Microcystis species. We isolated 6 different species of Microcystis (M. aeruginosa, M. ichthyoblabe, M. flos-aquae, M. novacekii, M. viridis and M. wesenbergii) from drinking water supply dams (Yeongchun, Ankei, Gachang), and used microscopic method for morphological identification, molecular method for amplifying a partial region of mcyB gene and ELISA method for microcystin analysis. In the present study, 80% of M. aeruginosa strains contained mcy gene, followed by 45% (10 strains) of M. icthyoblabe, 33% (1 strain) of M. wesenbergii, and 11% (4 strains) of M. flos-aquae. Each percentage of mcy gene in Microcystis morphospecies was similar to that of microcystin production in Microcystis morophospecies. In conclusion, the present study shows that molecular method using mcy gene primers can be used as an indirect indicator for the monitoring of toxic cyanobacteria (Microcystis).

Ascotis selenaria, a major geometridae moth in citrus trees, annually damages the citrus leaves and fruits. The surface of young citrus fruit were usually fed by 1st larva of A. selenaria after landing or stepping onto the citrus fruits. To protect the larval damages of citrus fruits needs to predict the accurate occurrence time of the 1st larva for spraying. Because larval occurrences is dependent on the oviposition of adult female and the eggs were not found in/on citrus trees, oviposition model of A. selenaria linked with the egg development model will be helpful of protecting larval damages on citrus fruits. Adult longevity, survival and fecundity of A.selenaria was investigated at 13, 16, 20, 24, 28, 30, 32, and 35℃. The longevity decreased as the temperature increased and the female development rates (1/median longevity) were well described by a modified sigmoid model, which was used to calculate the adult physiological age. Description of the total fecundity was used by a non-linear model: The maximum fecundity of A. selenaria was estimated as 2490 eggs and peaked temperature was 19.7℃ according to the fecundity model. The cumulative age-specific oviposition rate and the age-specific survival rate was well described by 2 parameters Weibull function and a reverse logistic curve respectively. Total fecundity model, age-sepecific oviposition model, and age-specific survival model were incorporated into the oviposition model.

본 연구는 임하호의 고탁수 발생에 따른 식물플랑크톤군집의 변화를 조사하기 위하여 2003년 5월부터 2004년 7월까지 댐축 지점에서 매월 채집하였다. 2003년 9월과 10월의 가장 높은 탁도(1221 NTU) 형성은 태풍(매미)에 동반된 집중 호우 시기와 일치하였다. 출현한 식물플랑크톤은 모두 102분류군이고, 이 중 규조강이 63종류로 가장 많이 출현하였으며, 녹조강이 23종류, 남조강이 9종류, 시누라조강과 은편모조강이 각각 3종류 그리고 유글레나 조강이 1종류가 출현하였다. 총 현존량은 270~4,515 indls. mL-1였고, 은편모조강의 Cryptomonas ovata, 규조강의 Cyclotella sp. 그리고 남조강의 Microcystis aeruginosa 등은 고탁수의 감소후 차례로 우점하였다.