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Responses of Aquatic Bacteria to Terrestrial Runoff: Effects on Community Structure and Key Taxonomic Groups
- Source :
- Frontiers in Microbiology, Frontiers in Microbiology, Frontiers Media, 2016, 7, pp.889. ⟨10.3389/fmicb.2016.00889⟩, Frontiers in Microbiology (7), . (2016), Frontiers in Microbiology, Frontiers Media, 2016, 7, pp.889. 〈10.3389/fmicb.2016.00889〉, Frontiers in Microbiology, 2016, 7, pp.889. ⟨10.3389/fmicb.2016.00889⟩
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- International audience; Organic fertilizer application is often touted as an economical and effective method to increase soil fertility. However, this amendment may increase dissolved organic carbon (DOC) runoff into downstream aquatic ecosystems and may consequently alter aquatic microbial community. We focused on understanding the effects of DOC runoff from soils amended with compost, vermicompost, or biochar on the aquatic microbial community of a tropical reservoir. Runoff collected from a series of rainfall simulations on soils amended with different organic fertilizers was incubated for 16 days in a series of 200 L mesocosms filled with water from a downstream reservoir. We applied 454 high throughput pyrosequencing for bacterial 16S rRNA genes to analyze microbial communities. After 16 days of incubation, the richness and evenness of the microbial communities present decreased in the mesocosms amended with any organic fertilizers, except for the evenness in the mesocosms amended with compost runoff. In contrast, they increased in the reservoir water control and soil-only amended mesocosms. Community structure was mainly affected by pH and DOC concentration. Compared to the autochthonous organic carbon produced during primary production, the addition of allochthonous DOC from these organic amendments seemed to exert a stronger effect on the communities over the period of incubation. While the Proteobacteria and Actinobacteria classes were positively associated with higher DOC concentration, the number of sequences representing key bacterial groups differed between mesocosms particularly between the biochar runoff addition and the compost or vermi-compost runoff additions. The genera of Propionibacterium spp. and Methylobacterium spp. were highly abundant in the compost runoff additions suggesting that they may represent sentinel species of complex organic carbon inputs. Overall, this work further underlines the importance of studying the off-site impacts of organic fertilizers as their impact on downstream aquatic systems is not negligible.
- Subjects :
- 0301 basic medicine
Microbiology (medical)
compost
engrais organique
engineering.material
DOC
Microbiology
complex mixtures
03 medical and health sciences
[ SDV.MP ] Life Sciences [q-bio]/Microbiology and Parasitology
Dissolved organic carbon
Biochar
biochar
Original Research
2. Zero hunger
Total organic carbon
communauté microbienne
Ecology
Compost
Aquatic ecosystem
Microbiology and Parasitology
fungi
04 agricultural and veterinary sciences
15. Life on land
ruissellement
Microbiologie et Parasitologie
carbone organique
écosystème aquatique
fertilité du sol
030104 developmental biology
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology
13. Climate action
Environmental chemistry
040103 agronomy & agriculture
engineering
0401 agriculture, forestry, and fisheries
Environmental science
aquatic microbial community
mesocosms
Surface runoff
Organic fertilizer
Vermicompost
Subjects
Details
- Language :
- English
- ISSN :
- 1664302X
- Database :
- OpenAIRE
- Journal :
- Frontiers in Microbiology, Frontiers in Microbiology, Frontiers Media, 2016, 7, pp.889. ⟨10.3389/fmicb.2016.00889⟩, Frontiers in Microbiology (7), . (2016), Frontiers in Microbiology, Frontiers Media, 2016, 7, pp.889. 〈10.3389/fmicb.2016.00889〉, Frontiers in Microbiology, 2016, 7, pp.889. ⟨10.3389/fmicb.2016.00889⟩
- Accession number :
- edsair.doi.dedup.....60086accecef1563d772d648e0c01c5a