갈조류 톳의 포복지 재활용을 위한 친환경적 해적생물 구제: pH와 염분
Environmentally Friendly Phytal Animal Removal for Re-use of Holdfasts of Sargassum fusiforme (Harvey) Setchell: pH and Salinity
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The brown seaweed Sargassum fusiforme is an edible and highly valued in Korea. Duringthe summer season, phytal organisms graze heavily on young algal blades and holdfastsof thespecies and substantially reduce harvestable biomass. Here, in this study, we investigated theeffects of pH (range: 2~13) and salinity (range: 0~44 psu) on the removal of two major phytalanimals, Caprella scaura and Gammaropsis utinomi, associated with S. fusiforme. We also examinedthe optimum quantum yield (Fv/Fm) of algae in the same experimental conditions to quantifythe tolerance of algae to acid and salinity treatments. It was observed that the phytal animalsshowed more than 80% mortality at pH lower that pH 4 and the extreams of salinity (0~10 psuand 44 psu) after a 5 min of immersion. However, the quantum yield of S. fusiforme was not significantlydifferent from controls within the pH 3~11 range, and the 0~44 psu salinity range. Precisely,if the pH and salinity conditions outside these ranges were used in comercial Sargassumculture, the removal of the animal species would be higher, but with reduced quantum yield ofalgae. Taken together, our study results indicated that the pH and salinity treatments could allowmultiple harvests from the same holdfast of S. fusiforme.
Abstract
The brown seaweed Sargassum fusiforme is an edible and highly valued in Korea. Duringthe summer season, phytal organisms graze heavily on young algal blades and holdfastsof thespecies and substantially reduce harvestable biomass. Here, in this study, we investigated theeffects of pH (range: 2~13) and salinity (range: 0~44 psu) on the removal of two major phytalanimals, Caprella scaura and Gammaropsis utinomi, associated with S. fusiforme. We also examinedthe optimum quantum yield (Fv/Fm) of algae in the same experimental conditions to quantifythe tolerance of algae to acid and salinity treatments. It was observed that the phytal animalsshowed more than 80% mortality at pH lower that pH 4 and the extreams of salinity (0~10 psuand 44 psu) after a 5 min of immersion. However, the quantum yield of S. fusiforme was not significantlydifferent from controls within the pH 3~11 range, and the 0~44 psu salinity range. Precisely,if the pH and salinity conditions outside these ranges were used in comercial Sargassumculture, the removal of the animal species would be higher, but with reduced quantum yield ofalgae. Taken together, our study results indicated that the pH and salinity treatments could allowmultiple harvests from the same holdfast of S. fusiforme.
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