首页|Adaptive strategies of high and low nucleic acid prokaryotes in response to declining resource availability and selective grazing by protozoa

Adaptive strategies of high and low nucleic acid prokaryotes in response to declining resource availability and selective grazing by protozoa

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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.

Microbial loopMacrocosm experimentProkaryoteTop-down and bottom-up controlsCarbon flow

Chen HU、Liuqian YU、Xiaowei CHEN、Jihua LIU、Yao ZHANG、John BATT、Xilin XIAO、Qiang SHI、Rui ZHANG、Tingwei LUO、Nianzhi JIAO、Dapeng XU

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College of the Environment and Ecology Xiamen University Xiamen 361102,China

State Key Laboratory of Marine Environmental Science,College of Ocean and Earth Sciences,Fujian Key Laboratory of Marine Carbon Sequestration,Xiamen University,Xiamen 361102,China

Joint Lab for Ocean Research and Education(LORE)of Dalhousie University Canada,and Shandong University and Xiamen University,Xiamen 361102,China

Earth,Ocean and Atmospheric Sciences Thrust,The Hong Kong University of Science and Technology(Guangzhou),Guangzhou 510000,China

Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China

Department of Oceanography,Dalhousie University,Halifax,Nova Scotia B3H 4R2,Canada

Institute for Advanced Study,Shenzhen University,Shenzhen 518060,China

Carbon Neutral Innovation Research Center,Xiamen University,Xiamen 361102,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Fujian Province of ChinaMarine Economic Development Special Fund Project of Fujian Province of ChinaChina Postdoctoral Science FoundationInnovation Team Project of Universities in Guangdong ProvincePh.D.Fellowship of the State Key Laboratory of Marine Environmental Science at Xiamen University

42188102418611440182023J05017FJHJF-L-2022-112021M6918632023KCXTD028

2024

10.1007/s11430-023-1326-2

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(6)