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The Input of Terrestrial Dissolved Organic Carbon Enhanced Bacteria Growth Efficiency on Phytoplankton-DOC and Indigenous Lake DOC: A Microcosm Study

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Název: The Input of Terrestrial Dissolved Organic Carbon Enhanced Bacteria Growth Efficiency on Phytoplankton-DOC and Indigenous Lake DOC: A Microcosm Study
Autoři: Zong’an Jin, Huiping Zhang, Zhengwen Liu, Erik Jeppesen, Jian Gao, Yali Tang
Zdroj: Microorganisms, Vol 13, Iss 9, p 2081 (2025)
Informace o vydavateli: MDPI AG, 2025.
Rok vydání: 2025
Sbírka: LCC:Biology (General)
Témata: bacterial growth efficiently, autochthonous DOC, allochthonous DOC, metabolic strategies, stable isotope, Biology (General), QH301-705.5
Popis: As a consequence of global climate change, lakes are increasingly receiving terrestrial dissolved organic carbon (DOC), which serves as a key substrate for microbial metabolism and fuels bacterial production (BP). However, bacteria in aquatic systems play a dual role in the carbon cycle by not only incorporating DOC into their biomass but also respiring it as CO2 into the atmosphere (bacterial respiration, BR). As such, the estimation of bacterial growth efficiency (BGE), defined as BP/(BP + BR), is critical for understanding lake carbon dynamics and bacterial carbon processing. To investigate the effects of terrestrial organic carbon on bacterial carbon processing in lakes, we conducted a 13C-labeling experiment utilizing three microcosms, each filled with 0.22 μm filtered lake water inoculated with a microbial inoculum and set as follows: no extra DOC addition as a control, adding phytoplankton-derived DOC, and adding a mixture of phytoplankton-derived and terrestrial DOC. Our findings revealed that the addition of terrestrial DOC significantly enhanced both overall BGE (40.0%) and specific BGE based on phytoplankton-DOC (62.3%) and indigenous lake DOC (27.0%). Furthermore, terrestrial DOC inputs also altered bacterial carbon consumption pathways, as indicated by isotopic evidence. These results suggest that the input of terrestrial DOC may significantly affect lake DOC processing by changing the way bacteria process phytoplankton-DOC and indigenous lake DOC. This study highlights the profound influence of terrestrial DOC on lake carbon processing and suggests that terrestrial–aquatic cross-ecosystem interactions are critical for understanding lake carbon dynamics under changing climatic conditions.
Druh dokumentu: article
Popis souboru: electronic resource
Jazyk: English
ISSN: 2076-2607
Relation: https://www.mdpi.com/2076-2607/13/9/2081; https://doaj.org/toc/2076-2607
DOI: 10.3390/microorganisms13092081
Přístupová URL adresa: https://doaj.org/article/1d03ba1dbcd348d6bcde6a5b087e1f10
Přístupové číslo: edsdoj.1d03ba1dbcd348d6bcde6a5b087e1f10
Databáze: Directory of Open Access Journals
Popis
Abstrakt:As a consequence of global climate change, lakes are increasingly receiving terrestrial dissolved organic carbon (DOC), which serves as a key substrate for microbial metabolism and fuels bacterial production (BP). However, bacteria in aquatic systems play a dual role in the carbon cycle by not only incorporating DOC into their biomass but also respiring it as CO2 into the atmosphere (bacterial respiration, BR). As such, the estimation of bacterial growth efficiency (BGE), defined as BP/(BP + BR), is critical for understanding lake carbon dynamics and bacterial carbon processing. To investigate the effects of terrestrial organic carbon on bacterial carbon processing in lakes, we conducted a 13C-labeling experiment utilizing three microcosms, each filled with 0.22 μm filtered lake water inoculated with a microbial inoculum and set as follows: no extra DOC addition as a control, adding phytoplankton-derived DOC, and adding a mixture of phytoplankton-derived and terrestrial DOC. Our findings revealed that the addition of terrestrial DOC significantly enhanced both overall BGE (40.0%) and specific BGE based on phytoplankton-DOC (62.3%) and indigenous lake DOC (27.0%). Furthermore, terrestrial DOC inputs also altered bacterial carbon consumption pathways, as indicated by isotopic evidence. These results suggest that the input of terrestrial DOC may significantly affect lake DOC processing by changing the way bacteria process phytoplankton-DOC and indigenous lake DOC. This study highlights the profound influence of terrestrial DOC on lake carbon processing and suggests that terrestrial–aquatic cross-ecosystem interactions are critical for understanding lake carbon dynamics under changing climatic conditions.
ISSN:20762607
DOI:10.3390/microorganisms13092081