Gao Guang, Clare Anthony S, Rose Craig, Caldwell Gary S
School of Marine Science and Technology, Ridley Building, Newcastle University, Newcastle upon Tyne NE1 7RU, England, UK.
Seaweed & Co. Ltd., Office 2.3 North Tyneside Business Centre, 54a Saville Street, North Tyneside NE30 1NT, England, UK.
Mar Pollut Bull. 2017 Jan 15;114(1):439-447. doi: 10.1016/j.marpolbul.2016.10.003. Epub 2016 Oct 10.
The incidence and severity of extraordinary macroalgae blooms (green tides) are increasing. Here, climate change (ocean warming and acidification) impacts on life history and biochemical responses of a causative green tide species, Ulva rigida, were investigated under combinations of pH (7.95, 7.55, corresponding to lower and higher pCO), temperature (14, 18°C) and nitrate availability (6 and 150μmolL). The higher temperature accelerated the onset and magnitude of gamete settlement. Any two factor combination promoted germination and accelerated growth in young plants. The higher temperature increased reproduction, which increased further in combination with elevated pCO or nitrate. Reproductive success was highest (64.4±5.1%) when the upper limits of all three variables were combined. Biochemically, more protein and lipid but less carbohydrate were synthesized under higher temperature and nitrate conditions. These results suggest that climate change may cause more severe green tides, particularly when eutrophication cannot be effectively controlled.
异常大型海藻爆发（绿潮）的发生率和严重程度正在上升。在此，研究了气候变化（海洋变暖和酸化）对一种引发绿潮的物种——石莼的生活史和生化反应的影响，实验设置了pH值（7.95、7.55，分别对应较低和较高的pCO₂）、温度（14、18°C）和硝酸盐可利用性（6和150μmol/L）的组合。较高温度加速了配子沉降的起始和程度。任何两种因素的组合都促进了幼苗的萌发并加速了其生长。较高温度增加了繁殖率，在pCO₂升高或硝酸盐浓度升高的情况下繁殖率进一步增加。当三个变量的上限同时出现时，繁殖成功率最高（64.4±5.1%）。在生化方面，在较高温度和硝酸盐条件下合成了更多的蛋白质和脂质，但碳水化合物较少。这些结果表明，气候变化可能导致更严重的绿潮，特别是在富营养化无法有效控制的情况下。
