

FOLLOWUS
1.State Key Laboratory of Lake and Watershed Science for Water Security, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 211135, China
2.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Evolution and Conservation Biology, Southern Marine Sciences and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
5.Sino-Danish Center for Education and Research, University of Chinese Academy of Sciences, Beijing 100049, China
6.The Fuxianhu Station of Plateau Deep Lake Research, Chinese Academy of Sciences, Yuxi 653100, China
lmshi@niglas.ac.cn
Received:04 December 2024,
Accepted:27 February 2025,
Online First:23 April 2025,
Published:01 January 2026
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ZHANG Yuqing,SHI Limei,CAI Yuanfeng,et al.Processes of microbial utilization of algal-derived organic carbon and their influence by exogenous organic carbon[J].Journal of Oceanology and Limnology,2026,44(01):268-283.
ZHANG Yuqing,SHI Limei,CAI Yuanfeng,et al.Processes of microbial utilization of algal-derived organic carbon and their influence by exogenous organic carbon[J].Journal of Oceanology and Limnology,2026,44(01):268-283. DOI: 10.1007/s00343-025-4328-5.
In natural aquatic ecosystems
algal-derived organic carbon (AOC) often coexists with exogenous organic carbon (EOC). Microbial utilization of these distinct carbon sources affects carbon flux and transformation in water column and algal growth.
Microcystis
blooms significantly increase AOC levels in water
but the microbial transformation process of
Microcystis
-derived AOC in the presence of EOC remain poorly understood. We conducted a simulated experiment by introducing
13
C-sodium bicarbonate and
13
C-glucose as substrates for indoor simulation of non-axenic
Microcystis
aeruginosa
(
M
.
aeruginosa
) populations in a sealed system. The microbial transformation processes of AOC and EOC and their effects on
M
.
aeruginosa
growth were investigated. Results demonstrated that the addition of glucose accelerated
M
.
aeruginosa
growth and significantly increased their biomass. During the experiment
as the particulate organic carbon and nitrogen content increased
the concentrations of CO
2
and N
2
O were gradually decreased
while the concentration of CH
4
were gradually increased. Significant differences were observed in the microbial processes involved in the uptake of AOC and EOC. Bacteria involved in AOC transformation throughout the growth period were dominated by Proteobacteria
Gemmatimonadota
Actinobacteriota
Bacteroidota
Acidobacteriota
and Firmicutes. The bacteria involved in EOC transformation were dominated by Proteobacteria
Actinobacteriota
Firmicutes
Cyanobacteria
Armatimonadota
and Bacteroidota. Linear discriminant analysis Effect Size (LEfSe) analysis revealed
Massilia
and
Akkermansia
as biomarkers involved in AOC transformation
while
Ligilactobacillus
was associated with EOC transformation. These findings provide valuable in
sights into the effects of EOC on algae-bacteria interaction
and on the dynamics of carbon and nitrogen cycling among
M
.
aeruginosa
and its associated bacteria.
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