| Abstract |
This study mainly focused on isolation of marine algicidal bacteria associated with phytoplankton blooms and
characterization of algicidal activity against harmful algae. Harmful algal blooms (HABs) found naturally in surface waters have caused
many environmental problems worldwide. In this study, forty bacterial strains that have capability of inhibiting harmful algal growth were
isolated from Masan Bay, Jinhae Bay, Dol Island, Jangmok Bay, and the Tongyeong Sea, Republic of Korea. The bacteria were screened
furthermore for the characteristics on algicidal activities against Cochlodinium polykrikoides, Chattonella marina, Skeletonema
costatum, Heterosigma akashiwo, Heterocapsa triquetra, Prorocentrum minimum, and Scrippsiella trochoidea. As a result, the algicidal
bacteria that were screened from double over layer agar and microscopic counts tests belonged to genera Pseudomonas, Vibrio,
Bacillus, Pseudoalteromonas, Ruegeria, Joostella, Marinomonas, Stakelama, Porphyrobacter, and Albirhodobacter. One of the most
important HAB species is Co. polykrikoides and the strongest algicidal activity against the dinoflagellate was 94.00% after 6 h treatment
with 10% bacterial culture filtrate. In this study, Marinomonas sp. M Jin 1-8, Stakelama sp. ZB Yeonmyeong 1-11 & 1-13, Porphyrobacter
sp. M Yeonmyeong 2-22, and Albirhodobacter sp. 6-R Jin 6-1 were found to be as new genera of bacteria having anti-algal activity. These
results suggest that these bacteria might play an important role in controlling phytoplankton blooms. |
