Dai Rongbo, Wen Zuozhu, Hong Haizheng, Browning Thomas J, Hu Xiaohua, Chen Ze, Liu Xin, Dai Minhan, Morel François M M, Shi Dalin
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361102, People's Republic of China.
Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel 24148, Germany.
Proc Natl Acad Sci U S A. 2025 Mar 18;122(11):e2423680122. doi: 10.1073/pnas.2423680122. Epub 2025 Mar 10.
Ocean acidification caused by increasing anthropogenic CO is expected to impact marine phytoplankton productivity, yet the extent and even direction of these changes are not well constrained. Here, we investigate the responses of phytoplankton community composition and productivity to acidification across the western North Pacific. Consistent reductions in primary production were observed under acidified conditions in the North Pacific Subtropical Gyre and the northern South China Sea, whereas no significant changes were found at the northern boundary of the subtropical gyre. While prokaryotic phytoplankton showed little or positive responses to high CO, small (<20 µm) eukaryotic phytoplankton which are primarily limited by low ambient nitrogen drove the observed decrease in community primary production. Extrapolating these results to global tropical and subtropical oceans predicts a potential decrease of about 5 Pg C y in primary production in low Chl- oligotrophic regions, which are anticipated to experience both acidification and stratification in the future.
人为源二氧化碳增加导致的海洋酸化预计会影响海洋浮游植物的生产力，然而这些变化的程度乃至方向尚未得到很好的界定。在此，我们研究了北太平洋西部浮游植物群落组成和生产力对酸化的响应。在北太平洋亚热带环流和南海北部的酸化条件下，初级生产力持续下降，而在亚热带环流的北部边界未发现显著变化。虽然原核浮游植物对高二氧化碳浓度的反应很小或呈阳性，但主要受低环境氮限制的小型（<20微米）真核浮游植物导致了群落初级生产力的下降。将这些结果外推至全球热带和亚热带海洋预测，低叶绿素寡营养区域的初级生产力可能会下降约5Pg C y，预计这些区域未来将同时经历酸化和分层。
