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Changes in sediment methanogenic archaea community structure and methane production potential following conversion of coastal marsh to aquaculture ponds

Ping Yang Orcid Logo, Kam Tang Orcid Logo, Chuan Tong, Derrick Y.F. Lai, Lianzuan Wu, Hong Yang, Linhai Zhang, Chen Tang, Yan Hong, Guanghui Zhao

Environmental Pollution, Volume: 305, Start page: 119276

Swansea University Author: Kam Tang Orcid Logo

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Abstract

Widespread conversion of coastal wetlands into aquaculture ponds in the Chinese coastal region often results in degradation of the wetland ecosystems, but its effects on sediment’s potential to produce greenhouse gases remain unclear. Using field sampling, incubation experiments and molecular analys...

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Published in: Environmental Pollution
ISSN: 0269-7491
Published: Elsevier BV 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa59764
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Abstract: Widespread conversion of coastal wetlands into aquaculture ponds in the Chinese coastal region often results in degradation of the wetland ecosystems, but its effects on sediment’s potential to produce greenhouse gases remain unclear. Using field sampling, incubation experiments and molecular analysis, we studied the sediment CH4 production potential and the relevant microbial communities in a brackish marsh and the nearby aquaculture ponds in the Min River Estuary in southeastern China. Sediment CH4 production potential was higher in the summer and autumn months than in spring and winter months, and it was best correlated with sediment carbon content among all environmental variables. The mean sediment CH4 production potential in the aquaculture ponds (20.1 ng g–1 d–1) was significantly lower than that in the marsh (45.2 ng g–1 d–1). While Methanobacterium dominated in both habitats (41-59%), the overall composition of sediment methanogenic archaea communities differed significantly between the two habitats (p<0.05) and methanogenic archaea alpha diversity was lower in the aquaculture ponds (p<0.01). Network analysis revealed that interactions between sediment methanogenic archaea were much weaker in the ponds than in the marsh. Overall, these findings suggest that conversion of marsh land to aquaculture ponds significantly altered the sediment methanogenic archaea community structure and diversity and lowered the sediment’s capacity to produce CH4.
Keywords: Methane production; Methanogenic archaea; Network analysis; Land-use and land coverage change (LULCC); Coastal wetlands; Aquaculture systems
College: Faculty of Science and Engineering
Start Page: 119276