지역 특이적인 Heterosigma akashiwo 의 염분과 미량원소에 따른 다른 성장 패턴

Abstract

H. akashiwo, one of famous HABs (harmful algal blooms species), blooms are characterized by a high growth rate. Especially, rapid growth is important in dense bloom formation (Bearon et al., 2006). Physicochemical factors, such as water temperature, salinity, light intensity and nutrients, strongly affect bloom formation (Tilman et al. 1982; Erga and Heimdal 1984; Smayda 1998; Diehl et al. 2002). Thus, we report the comparisons of different geological originated H. akashiwo strain for influence on salinity, light intensity and micronutrient. For this study, physiological characteristic of vegetative strain from cyst (HYM06HA) and the other strains from southern eastern coastal water in Korea (NFHTS-AK-1) and Ling Island Sound, USA (CCMP 452) are compared. To compare the different geological difference, we estimate the maximum growth rates during the exponential phase. The CCMP 452 strain was grows well at all salinity gradients except extreme condition like 5 and 40 psu. Uniquely, the optimal growth rate conditions for salinity of Korean strains were 10 and from 25 to 30 psu. It seems to be the bimodal distribution. The NFHTS-AK-1 was shown maximum growth rate at 50 µmol photons m-2 s-1 and HYM06HA was 125 µmol photons m-2 s-1. CCMP 452 grows well from 50 µmol photons m-2 s-1. Phosphate source affected a lot to the growth rate of Korean strains. In contrast the strain, wh temperature, salinity, light intensity and nutrients, strongly affect bloom formation (Tilman et al. 1982; Erga and Heimdal 1984; Smayda 1998; Diehl et al. 2002). Thus, we report the comparisons of different geological originated H. akashiwo strain for influence on salinity, light intensity and micronutrient. For this study, physiological characteristic of vegetative strain from cyst (HYM06HA) and the other strains from southern eastern coastal water in Korea (NFHTS-AK-1) and Ling Island Sound, USA (CCMP 452) are compared. To compare the dif