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Effects of nutrient load on microbial activities within a seagrass-dominated ecosystem: implications of changes in seagrass blue carbon

Liu, Songlin, Jiang, Zhijian, Wu, Yunchao, Zhang, Jingping, Arbi, Iman, Ye, Feng, Huang, Xiaoping and Macreadie, Peter Ian 2017, Effects of nutrient load on microbial activities within a seagrass-dominated ecosystem: implications of changes in seagrass blue carbon, Marine pollution bulletin, vol. 117, no. 1-2, pp. 214-221, doi: 10.1016/j.marpolbul.2017.01.056.

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Title Effects of nutrient load on microbial activities within a seagrass-dominated ecosystem: implications of changes in seagrass blue carbon
Author(s) Liu, Songlin
Jiang, Zhijian
Wu, Yunchao
Zhang, Jingping
Arbi, Iman
Ye, Feng
Huang, Xiaoping
Macreadie, Peter IanORCID iD for Macreadie, Peter Ian orcid.org/0000-0001-7362-0882
Journal name Marine pollution bulletin
Volume number 117
Issue number 1-2
Start page 214
End page 221
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2017-04-15
ISSN 0025-326X
1879-3363
Keyword(s) Extracellular enzymes activities
Microbial community structure
PLFA
Seagrass bed
Sediment organic carbon
δ(13)C
Summary Nutrient loading is a leading cause of global seagrass decline, triggering shifts from seagrass- to macroalgal-dominance. Within seagrass meadows of Xincun Bay (South China Sea), we found that nutrient loading (due to fish farming) increased sediment microbial biomass and extracellular enzyme activity associated with carbon cycling (polyphenol oxidase, invertase and cellulase), with a corresponding decrease in percent sediment organic carbon (SOC), suggesting that nutrients primed microorganism and stimulated SOC remineralization. Surpisingly, however, the relative contribution of seagrass-derived carbon to bacteria (δ(13)Cbacteria) increased with nutrient loading, despite popular theory being that microbes switch to consuming macroalgae which are assumed to provide a more labile carbon source. Organic carbon sources of fungi were unaffected by nutrient loading. Overall, this study suggests that nutrient loading changes the relative contribution of seagrass and algal sources to SOC pools, boosting sediment microbial biomass and extracellular enzyme activity, thereby possibly changing seagrass blue carbon.
Language eng
DOI 10.1016/j.marpolbul.2017.01.056
Field of Research 050204 Environmental Impact Assessment
060701 Phycology (incl Marine Grasses)
MD Multidisciplinary
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30093434

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