报告摘要：

To evaluate the responses of microbial plankton communities to warming in coastal waters of the Pacific at different latitudes, three in situ microcosms were conducted in Taiwan and Japan during the winter of 2023. Flow cytometry was used for consecutive 7 days to monitor and analyze the microbial communities, including viruses, bacteria, and picophytoplankton (Synechococcus spp., Prochlorococcus spp., and picoeukaryotes). The control microcosms had the same natural water temperature as the coastal waters, while the others were subjected to a warming treatment of +2-3°C. In addition, picoplankton (bacteria and picophytoplankton) growth, nanoflagellate grazing, and viral lysis rates were estimated by using modified dilution method on days 2 and 5 of the study. Our investigation revealed that the warming did not have a significant positive effect on the bacterial abundance in winter at all stations during the time-series incubations. However, a significant increase in viral abundance was observed following the temperature increase, indicating that viral impact can have a significant top-down effect on bacterial cells in our time series experiments. Furthermore, we also found that the degree of increase in viral abundance was related to picophytoplankton abundance which increased with warming at some stations in this study. Importantly, we also discovered a positive correlation between the increases in prokaryotic viral lysis and gross growth rates in the warming experiments. This suggests that increased warming in coastal water during cold seasons can potentially enhance the viral shunt, enabling the retention of carbon and energy within the microbial loop.

报告人简介：

蔡安益教授2005年于台湾海洋大学获博士学位，2010年至今在台湾海洋大学环境与生态研究所任职，曾任台湾海洋大学研究船务中心主任，海洋环境与生态研究所所长，目前兼任台湾自然与永续发展司海洋学科复审委员。长期从事海洋生态学及生态模式、环境生物学的研究。