북한강 수역에서 분리한 남조류 Anabaena circinalis 휴면포자 발아에 대한 환경요인의 영향 (Effects of Environmental Factors on Akinete Germination of Anabaena circinalis (Cyanobacteriaceae) Isolated from the North Han River, Korea)

서지정보

· 발행기관 : 한국수생태학회
· 수록지 정보 : 생태와 환경 / 47권 / 4호 / 292 ~ 301페이지
· 저자명 : 박채홍, 임병진, 유경아, 박명환, 황순진

초록

Akinete germination may be a starting point of some akinete-producing cyanobacterial blooms ineutrophic freshwater systems. This study examined germinability of akinete of a cyanobacterium Anabaenacircinalis isolated from the sediment of the North Han River (Cheongpyung Dam), Korea, under several environmentalfactors such as temperature (5~25℃), light (0~100 μmol photons m-2 s-1), nutrients (nitrogen andphosphorus) and pH (5~12). The high germination rate appeared at high temperature: ¤55% at 25℃, followedby 15% at 15℃, 10℃ and 10% at 5℃. Low light intensity was favorable for akinete germination. Over45% of germination occurred at low light intensities (5, 15 and 30 μmol photons m-2 s-1), while less than 10%of germination occurred at both 50 and 100 μmol photons m-2 s-1. No germination occurred in the dark condition.
Akinete germination rate increased with nutrient (phosphorus and nitrogen) enrichment, and nitrogenaddition showed greater effect on the germination compared to phosphorus addition. Akinetes germinated wellat neutral or slightly alkaline pH condition (pH 7 and pH 8: ¤55%), but no germination was observed at pH11~12. The present study demonstrates some favorable ambient conditions of Anabaena circinalis germination,which could provide useful information to study the germination conditions of other Anabaena speciesor akinete-forming algae and predict its bloom in eutrophic freshwaters.

영어초록

Akinete germination may be a starting point of some akinete-producing cyanobacterial blooms ineutrophic freshwater systems. This study examined germinability of akinete of a cyanobacterium Anabaenacircinalis isolated from the sediment of the North Han River (Cheongpyung Dam), Korea, under several environmentalfactors such as temperature (5~25 C), light (0~100 μmol photons m-2 s-1), nutrients (nitrogen andphosphorus) and pH (5~12). The high germination rate appeared at high temperature: ¤55% at 25 C, followedby 15% at 15 C, 10 C and 10% at 5 C. Low light intensity was favorable for akinete germination. Over45% of germination occurred at low light intensities (5, 15 and 30 μmol photons m-2 s-1), while less than 10%of germination occurred at both 50 and 100 μmol photons m-2 s-1. No germination occurred in the dark condition.
Akinete germination rate increased with nutrient (phosphorus and nitrogen) enrichment, and nitrogenaddition showed greater effect on the germination compared to phosphorus addition. Akinetes germinated wellat neutral or slightly alkaline pH condition (pH 7 and pH 8: ¤55%), but no germination was observed at pH11~12. The present study demonstrates some favorable ambient conditions of Anabaena circinalis germination,which could provide useful information to study the germination conditions of other Anabaena speciesor akinete-forming algae and predict its bloom in eutrophic freshwaters.

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