| Full text | |
| Author(s): Show less - |
Almeida, Rafael M.
[1]
;
Nobrega, Gabriel N.
[2]
;
Junger, Pedro C.
[3]
;
Figueiredo, Aline V.
[4]
;
Andrade, Anizio S.
[5]
;
de Moura, Caroline G. B.
[5]
;
Tonetta, Denise
[6]
;
Oliveira, Jr., Ernandes S.
[7]
;
Araujo, Fabiana
[4]
;
Rust, Felipe
[1]
;
Pineiro-Guerra, Juan M.
[8, 9]
;
Mendonca, Jr., Jurandir R.
[4]
;
Medeiros, Leonardo R.
[5]
;
Pinheiro, Lorena
[10]
;
Miranda, Marcela
[1]
;
Costa, Mariana R. A.
[4]
;
Melo, Michaela L.
[11]
;
Nobre, Regina L. G.
[5]
;
Benevides, Thiago
[3]
;
Roland, Fabio
[1]
;
de Klein, Jeroen
[12]
;
Barros, Nathan O.
[1]
;
Mendonca, Raquel
[1, 13]
;
Becker, Vanessa
[4]
;
Huszar, Veral. M.
[14]
;
Kosten, Sarian
[7]
Total Authors: 26
|
| Affiliation: Show less - | [1] Univ Fed Juiz de Fora, Inst Ciencias Biol, Dept Biol, Aquat Ecol Lab, Juiz De Fora - Brazil
[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencia Solo, Piracicaba - Brazil
[3] Univ Fed Rio de Janeiro, Lab Limnol, Rio De Janeiro - Brazil
[4] Univ Fed Rio Grande do Norte, Lab Water Resources & Environm Sanitat, BR-59072970 Natal, RN - Brazil
[5] Univ Fed Rio Grande do Norte, Lab Limnol, BR-59072970 Natal, RN - Brazil
[6] Univ Fed Santa Catarina, Lab Freshwater Ecol, Florianopolis, SC - Brazil
[7] Radboud Univ Nijmegen, Dept Aquat Ecol & Environm Biol, Inst Water & Wetland Res, NL-6525 ED Nijmegen - Netherlands
[8] Univ Republica, Fac Ciencias, Montevideo - Uruguay
[9] Univ Republica, Dept Ecol Teor & Aplicada, Ctr Univ Reg Este, Montevideo - Uruguay
[10] Univ Fed Estado Rio de Janeiro, Dept Ciencias Nat, Rio De Janeiro - Brazil
[11] Univ Fed Sao Carlos, Lab Microbial Proc & Biodivers, BR-13560 Sao Carlos, SP - Brazil
[12] Wageningen Univ, Aquat Ecol & Environm Sci, NL-6700 AP Wageningen - Netherlands
[13] Uppsala Univ, Dept Ecol & Genet, Uppsala - Sweden
[14] Univ Fed Rio de Janeiro, Museu Nacl, Lab Ficol, Rio De Janeiro - Brazil
Total Affiliations: 14
|
| Document type: | Journal article |
| Source: | FRONTIERS IN MICROBIOLOGY; v. 7, MAY 18 2016. |
| Web of Science Citations: | 22 |
| Abstract | |
Recent studies from temperate lakes indicate that eutrophic systems tend to emit less carbon dioxide (Co-2) and bury more organic carbon (OC) than oligotrophic ones, rendering them CO2 sinks in some cases. However, the scarcity of data from tropical systems is critical for a complete understanding of the interplay between eutrophication and aquatic carbon (C) fluxes in warm waters. We test the hypothesis that a warm eutrophic system is a source of both CO2 and CH4 to the atmosphere, and that atmospheric emissions are larger than the burial of OC in sediments. This hypothesis was based on the following assumptions: (i) OC mineralization rates are high in warm water systems, so that water column CO2 production overrides the high C uptake by primary producers, and (ii) increasing trophic status creates favorable conditions for CH4 production. We measured water-air and sediment-water CO2 fluxes, CH4 diffusion, ebullition and oxidation, net ecosystem production (NEP) and sediment OC burial during the dry season in a eutrophic reservoir in the semiarid northeastern Brazil. The reservoir was stratified during daytime and mixed during nighttime. In spite of the high rates of primary production (4858 +/- 934 mg C m(-2) d(-1)), net heterotrophy was prevalent due to high ecosystem respiration (5209 +/- 992 mg C m(-2) d(-1)). Consequently, the reservoir was a source of atmospheric CO2 (518 +/- 182 mg C m(-2) d(-1)). In addition, the reservoir was a source of ebullitive (17 +/- 10 mg C m(-2) d(-1)) and diffusive CH4 (11 +/- 6 mg C m(-2) d(-1)). OC sedimentation was high (1162 mg C m(-2) d(-1)), but our results suggest that the majority of it is mineralized to CO2 (722 +/- 182 mg C m(-2) d(-1)) rather than buried as OC (440 mg C m(-2) d(-1)). Although temporally resolved data would render our findings more conclusive, our results suggest that despite being a primary production and OC burial hotspot, the tropical eutrophic system studied here was a stronger CO2 and CH4 source than a C sink, mainly because of high rates of OC mineralization in the water column and sediments. (AU) | |
| FAPESP's process: | 14/11778-5 - Subaqueous soils from Brazilian seagrass beds: biogeochemistry, genesis and classification |
| Grantee: | Gabriel Nuto Nóbrega |
| Support Opportunities: | Scholarships in Brazil - Doctorate |