点击次数：

影响因子：6.2

DOI码：10.1007/s11430-023-1326-2

所属单位：环境与生态学院

发表刊物：Science China Earth Sciences

关键字：Microbial loop, Macrocosm experiment, Prokaryote, Top-down and bottom-up controls, Carbon flow

摘要：Prokaryotes play a fundamental role in global ocean biogeochemical cycles. However, how the abundance and metabolic activity of ecologically distinct subgroups (i.e., high nucleic acid (HNA) and low nucleic acid (LNA) cells), and their regulating factors, change in response to changing marine environmental conditions remains poorly understood. Here, we delved into the time-evolving dynamic responses of the HNA and LNA prokaryotic subgroups to declining resource availability and selective grazing by protozoa by conducting a 73-day incubation experiment in a large-volume (117,000 L) macrocosm that facilitates community-level exploration. We found that the metabolic activity of the HNA subgroup was higher than that of the LNA subgroup when the macrocosm was resource replete but that the HNA subgroup declined more rapidly than the LNA subgroup as the resources became increasingly scarce, leading to a steadily increasing contribution of LNA cells to prokaryotic activity. Meanwhile, as resources in the macrocosm became limited, protozoan grazing preference shifted from the HNA to the LNA subgroup and the contributions of the LNA subgroup to the carbon flow within the macrocosm increased. The findings highlight the resilience of LNA cells in resource-limited environments, illuminate the critical role of selective grazing by protozoa in balancing distinct prokaryotic subgroups under changing resource conditions, and demonstrate the complex and adaptive interactions between protozoa and prokaryotes across diverse environmental contexts.

第一作者：Chen Hu

通讯作者：Nianzhi Jiao,Dapeng Xu

合写作者：Liuqian Yu,Xiaowei Chen,Jihua Liu,Yao Zhang,John Batt,Xilin Xiao,Qiang Shi,Rui Zhang,Tingwei Luo

论文类型：Article

文献类型：J

是否译文：否

发表时间：2024-04-26

收录刊物：SCI