수온, pH 및 염분의 조합된 환경인자가 대형 갈조류 3종의 초기 생활사에 미치는 영향
Temperature, pH, and Salinity as Combined Environmental Factors Affecting the Early Life Stages of Three Large Brown Algae
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In this study, a marine ecological toxicity assessment was conducted to evaluate the combined effects of water temperature, pH, and salinity on the early life cycle of large brown alga Undaria pinnatifida, Undariopsis peterseniana, and Ecklonia bicyclis. The results showed the germination rate of zoospores observed to pH and salinity for 72 hours revealed a clear linear concentration-response relationship in the range of 10.0–20.0°C. Germination rates of U. pinnatifida, U. peterseniana, and E. bicyclis decreased rapidly at pH 4.5 to 5.0 and salinity levels of 10.0 to 15.0 psu. The 72h-EC50 values for exposure substance were analyzed in the range of pH 4.4–4.7 and 11.6–16.7 psu. Sensitivity was highest in U. peterseniana regardless of water temperature, while U. pinnatifida and E. bicyclis showed no significant difference among the conditions. In conclusion, the environmental stress and tolerance of three large brown algal species at pH or salinity can potentially be increased or decreased by combined changes in seawater temperature, pH, and salinity, and are interpreted to differ depending on the species and life cycle stage of the seaweed. The findings of this study provided useful data for predicting eco-physiological changes in seaweed due to climate change, ocean acidification, and barren grounds.
Abstract
In this study, a marine ecological toxicity assessment was conducted to evaluate the combined effects of water temperature, pH, and salinity on the early life cycle of large brown alga Undaria pinnatifida, Undariopsis peterseniana, and Ecklonia bicyclis. The results showed the germination rate of zoospores observed to pH and salinity for 72 hours revealed a clear linear concentration-response relationship in the range of 10.0–20.0°C. Germination rates of U. pinnatifida, U. peterseniana, and E. bicyclis decreased rapidly at pH 4.5 to 5.0 and salinity levels of 10.0 to 15.0 psu. The 72h-EC50 values for exposure substance were analyzed in the range of pH 4.4–4.7 and 11.6–16.7 psu. Sensitivity was highest in U. peterseniana regardless of water temperature, while U. pinnatifida and E. bicyclis showed no significant difference among the conditions. In conclusion, the environmental stress and tolerance of three large brown algal species at pH or salinity can potentially be increased or decreased by combined changes in seawater temperature, pH, and salinity, and are interpreted to differ depending on the species and life cycle stage of the seaweed. The findings of this study provided useful data for predicting eco-physiological changes in seaweed due to climate change, ocean acidification, and barren grounds.