Vicinal land use change strongly drives stream bacterial community in a tropical montane catchment

Impact of land use (LU) change on stream environmental conditions and the inhabiting bacterial community remains rarely investigated, especially in tropical montane catchments. We examined the effects of LU change and its legacy along a tropical stream by comparing seasonal patterns of dissolved org...

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Published in:FEMS microbiology ecology Vol. 94; no. 11; p. 1
Main Authors: Le, Huong T, Rochelle-Newall, Emma, Auda, Yves, Ribolzi, Olivier, Sengtaheuanghoung, Oloth, Thébault, Elisa, Soulileuth, Bounsamay, Pommier, Thomas
Format: Journal Article
Language:English
Published: England Oxford University Press 01.11.2018
Wiley-Blackwell
Subjects:
annuals
Bacteria
Bacteria - isolation & purification
bacterial communities
bananas
biochemical pathways
Carbon - analysis
Catchments
community structure
Dissolved organic carbon
Dissolved organic matter
Ecology
Environmental aspects
Environmental conditions
environmental factors
France
Hydrology
Land use
land use change
Life Sciences
Microbial colonies
Microbiology
Mountains
Plantations
Rivers
Rivers - chemistry
Rivers - microbiology
seasonal variation
Seasonal variations
Seasons
streams
Tectona grandis
Tropical Climate
tropics
Watersheds
France
CDOM
bacterial diversity
land management
DOC
LU legacy
hyporheic zone
ISSN:1574-6941, 0168-6496, 1574-6941
Online Access:Get full text
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Summary:Impact of land use (LU) change on stream environmental conditions and the inhabiting bacterial community remains rarely investigated, especially in tropical montane catchments. We examined the effects of LU change and its legacy along a tropical stream by comparing seasonal patterns of dissolved organic carbon (DOC) / colored dissolved organic matter (CDOM) in relation to variations in structure, diversity and metabolic capacities of particle-attached (PA) and free-living (FL) bacterial communities. We hypothesized that despite seasonal differences, hydrological flows that accumulate allochthonous carbon along the catchment are a major controlling factor of the bacterial community. Surprisingly, local environmental conditions that were largely related to nearby LU and the legacy of LU change were more important for stream bacterial diversity than hydrological connectivity. DOC was strongly correlated with PA richness and diversity. The legacy of LU change between teak plantation and annual crops induced high DOC and high diversity and richness of PA in the adjacent waters, while banana plantations were associated with high diversity of FL. The community structures of both PA and FL differed significantly between seasons. Our results highlight the importance of vicinal LU change and its legacy on aquatic bacterial communities in mixed used tropical watersheds.
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ISSN:1574-6941
0168-6496
1574-6941
DOI:10.1093/femsec/fiy155