Paper Publications
Release time: 2025-04-13Hits:
- Impact Factor:6.2
- DOI number:10.1007/s11430-023-1326-2
- Affiliation of Author(s):环境与生态学院
- Journal:Science China Earth Sciences
- Key Words:Microbial loop, Macrocosm experiment, Prokaryote, Top-down and bottom-up controls, Carbon flow
- Abstract: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.
- First Author:Chen Hu
- Correspondence Author:Nianzhi Jiao,Dapeng Xu
- Co-author:Liuqian Yu,Xiaowei Chen,Jihua Liu,Yao Zhang,John Batt,Xilin Xiao,Qiang Shi,Rui Zhang,Tingwei Luo
- Indexed by:Article
- Document Type:J
- Translation or Not:no
- Date of Publication:2024-04-26
- Included Journals:SCI
MOBILE Version