Combined effects of ocean deoxygenation, acidification, and phosphorus limitation on green tide macroalga, Ulva prolifera

文献类型： 外文期刊

第一作者： Huang, Xintong

作者： Huang, Xintong;Li, Fang;Huang, Xintong;Xu, Dong;Ye, Naihao;Huang, Xintong;Xu, Dong;Ye, Naihao;Huang, Xintong;Xu, Dong;Ye, Naihao;Tong, Shanying;Ye, Naihao

作者机构：

关键词： Climate change; Photosynthesis; Alkaline phosphatase activity; Ulva prolifera; Low oxygen

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 894 卷

页码：

收录情况： SCI

摘要： Ocean deoxygenation, acidification, and decreased phosphorus availability are predicted to increase in coastal ecosys-tems under future climate change. However, little is known regarding the combined effects of such environmental var-iables on the green tide macroalga Ulva prolifera. Here, we provide quantitative and mechanistic understanding of the acclimation mechanisms of U. prolifera to ocean deoxygenation, acidification, and phosphorus limitation under both lab-oratory and semi-natural (mesocosms) conditions. We found that there were significant interactions between these global environmental conditions on algal physiological performance. Although algal growth rate and photosynthesis re-duced when the nitrogen-to-phosphorus (N/P) ratio increased from 16:1 to 35:1 under ambient CO2 and O2 condition, they remained constant with further increasing N/P ratios of 105:1, 350:1, and 1050:1. However, the increasing alka-line phosphatase activities at high N/P ratios suggests that U. prolifera could use organic P to support its growth under phosphorus limitation. Deoxygenation had no effect on specific growth rate (SGR) but decreased photosynthesis under low N/P ratios of 16:1, 35:1, and 105:1, with reduced activities of several enzymes involved in N assimilation pathway being observed. Elevated CO2 promoted algal growth and alleviated the negative effect of deoxygenation on algal pho-tosynthesis. The patterns of responses to high CO2 and low O2 treatments in in situ experiments were generally consistent with those observed in laboratory experiments. Our results generally found that the strong physiological acclimation ca-pacity to elevated CO2, low O2, and high N/P could contribute to its large-scale blooming in coastal ecosystem.

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