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Effects of Various Physical and Chemical Factors on the Death of Trouble Seaweed Ulva australis

구멍갈파래(Ulva australis) 해조류 사멸에 미치는 여러 물리화학적 요인들의 영향

  • Kim, Jin-Seog (Research Center for Eco-Friendly New Materials, Bio & Drug Discovery Division, Korea Research Institute of Chemical Technology) ;
  • Kwak, Hwa Sook (Research Center for Eco-Friendly New Materials, Bio & Drug Discovery Division, Korea Research Institute of Chemical Technology) ;
  • Kim, Bo Gwan (Research Center for Eco-Friendly New Materials, Bio & Drug Discovery Division, Korea Research Institute of Chemical Technology)
  • 김진석 (한국화학연구원 친환경신물질연구센터) ;
  • 곽화숙 (한국화학연구원 친환경신물질연구센터) ;
  • 김보관 (한국화학연구원 친환경신물질연구센터)
  • Received : 2017.08.22
  • Accepted : 2017.09.25
  • Published : 2017.09.30

Abstract

Green tides, which was mainly caused by Ulva spp., have been increasing in severity and frequency globally, and have negatively affected on marine ecosystems. This study was conducted to investigate effects of various physical and chemical factors on the death of Ulva australis (ULAUS) and to consider a practical measures useful for alleviating Ulva bloom. Soaking of ULAUS thalli in pure water for 8 hr didn't induce a death, but incubation in 1.0-1.5% salinity for 7 d inhibited sporulation by about 70%. Desiccation gave rise to a serious damage when more than 40-50% of initial fresh weight was lost. ULAUS growth was sensitive to temperature and seriously inhibited from more than $30^{\circ}C$. At $35^{\circ}C$, $40^{\circ}C$, $45^{\circ}C$ and $50^{\circ}C$, treatment time required for 90-95% death of ULAUS thalli was 1 d, 10 min, 30 sec, and 1 sec, repectively. ULAUS growth was seriously inhibited at lower than pH 6.0 and completely dead at pH 4.0. Several compounds for ULAUS control was selected and the chemcals causing a rapid death were oxidants such as hydrogen peroxide and sodium percarbonate. Taken together, our results suggest that low salinities, dryness, pH, high temp. and compounds could be selected for Ulva bloom control, and high temperature and compounds seems to be useful for a development of practical control methods.

Keywords

Chemical control;Dryness;pH;Physical control;Temperature;Ulva pertusa (australis)

Acknowledgement

Grant : Eco-friendly control methods for preventing the algal bloom of Ulva spp. in the seashore

Supported by : Korea Research Institute of Chemical Technology (KRICT)

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