Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China.
Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, 36 Baochubei Road, Hangzhou 310012, Zhejiang, People's Republic of China; Fourth Institute of Oceanography, Ministry of Natural Resources, 26 New Century Avenue, Beihai, 536000, Guangxi, People's Republic of China.
Sci Total Environ. 2022 Jan 20;805:150303. doi: 10.1016/j.scitotenv.2021.150303. Epub 2021 Sep 11.
Accumulating research evidence has revealed that harmful algal blooms (HABs) can substantially affect the community structures of phytoplankton and heterotrophic bacteria in marine ecosystems. However, little is known about their species-specific interactions between phytoplankton and heterotrophic bacteria during the HABs period and about their interaction shifts in response to blooms. From this perspective, we investigated the co-occurrence of chromophytic phytoplankton and Vibrio during Phaeocystis globosa blooms in the Beibu Gulf. The results showed that Vibrio communities were distinct during the blooms, and P. globosa blooms resulted in a decline in phytoplankton alpha diversity, revealing that the blooms could affect their community compositions. The regression lines between the Shannon indices and Bray-Curtis distances of phytoplankton and Vibrio showed positive correlations with each other (p < 0.001), suggesting that they may have intrageneric symbiotic interactions overall. In addition, network analysis further demonstrated that relationships between phytoplankton and Vibrio were dominated by positive correlations, and more interaction modules were observed during the blooms, revealing that the blooms intensified synergistic association and mutual symbiotic interactions between them. Environmental factors (SiO, NH, NO and TN,) and P. globosa density more deeply affected network interactions between phytoplankton and Vibrio during the periods of P. globosa blooms than those before the blooms and after the blooms. This study provided new insight to elucidate community structure and interaction relationships between phytoplankton and Vibrio in response to P. globosa blooms and their ecological effects in marine ecosystems.
越来越多的研究证据表明，有害藻华（HABs）会对海洋生态系统中的浮游植物和异养细菌群落结构产生重大影响。然而，人们对浮游植物和异养细菌在 HABs 期间的特定物种相互作用以及它们对藻类大量繁殖的响应的相互作用变化知之甚少。从这个角度来看，我们调查了北部湾夜光藻大量繁殖期间有色浮游植物和弧菌的共同出现。结果表明，弧菌群落在繁殖期间明显不同，而夜光藻大量繁殖导致浮游植物α多样性下降，表明繁殖会影响它们的群落组成。浮游植物和弧菌的 Shannon 指数和 Bray-Curtis 距离之间的回归线相互之间呈正相关（p<0.001），表明它们可能具有属内共生相互作用。此外，网络分析进一步表明，浮游植物和弧菌之间的关系主要呈正相关，在繁殖期间观察到更多的相互作用模块，表明繁殖加剧了它们之间的协同关联和相互共生相互作用。在夜光藻大量繁殖期间，环境因素（SiO、NH、NO 和 TN）和夜光藻密度对浮游植物和弧菌之间的网络相互作用的影响比繁殖前和繁殖后更深。本研究为阐明浮游植物和弧菌对夜光藻大量繁殖的群落结构和相互作用关系及其在海洋生态系统中的生态效应提供了新的见解。
