High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir
Recent studies from temperate lakes indicate that eutrophic systems tend to emit less carbon dioxide (CO2) 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...
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ri-123456789-308902020-12-13T08:01:55Z High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir Becker, Vanessa Almeida, Rafael M. Nóbrega, Gabriel N. Junger, Pedro C. Figueiredo, Aline V. Andrade, Anízio S. Moura, Caroline G. B. de Tonetta, Denise Oliveira Jr, Ernandes S. Araújo, Fabiana Rust, Felipe Piñeiro-Guerra, Juan M. Mendonça Jr, Jurandir R. Medeiros, Leonardo R. Pinheiro, Lorena Miranda, Marcela Costa, Mariana R. A. Melo, Michaela L. Nobre, Regina L. G. Benevides, Thiago Roland, Fábio Klein, Jeroen de Barros, Nathan O. Mendonça, Raquel Huszar, Vera L. M. Kosten, Sarian Carbon dioxide Methane Organic carbon burial Net ecosystem production Semiarid Caatinga Recent studies from temperate lakes indicate that eutrophic systems tend to emit less carbon dioxide (CO2) 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 CO (518 2 ± 182 mg C m−2 1 d− ). 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 2020-12-07T22:14:54Z 2020-12-07T22:14:54Z 2016-05-18 article ALMEIDA, R. M. NOBREGA, G. N. SOARES, P. C. J. FIGUEIREDO, A. V. ANDRADE, A. S. MOURA, C. G. B. TONETTA, D. OLIVEIRA JR, E. S. ARAUJO, F. O. RUST, F. PINEIRO-GUERRA, J. M. MENDONÇA JR., J.R. MEDEIROS, L. R. SILVA, L. P. MIRANDA, M. Costa, M.R.A. MELO, M. L. NOBRE, R. BENEVIDES, T. ROLAND, F. de KLEIN, J. BARROS, N. O. MENDONCA, R. BECKER, V. HUSZAR, V.L.M. , et al. ; High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir. Frontiers in Microbiology (Online), v. 7, p. 1-13,18 maio 2016. Frontiers Media SA. Disponível em <https://www.frontiersin.org/articles/10.3389/fmicb.2016.00717/full> Acesso em 20 out 2020. http://dx.doi.org/10.3389/fmicb.2016.00717. 1664-302X https://repositorio.ufrn.br/handle/123456789/30890 10.3389/fmicb.2016.00717 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Frontiers Media |
| institution |
Repositório Institucional |
| collection |
RI - UFRN |
| language |
English |
| topic |
Carbon dioxide Methane Organic carbon burial Net ecosystem production Semiarid Caatinga |
| spellingShingle |
Carbon dioxide Methane Organic carbon burial Net ecosystem production Semiarid Caatinga Becker, Vanessa Almeida, Rafael M. Nóbrega, Gabriel N. Junger, Pedro C. Figueiredo, Aline V. Andrade, Anízio S. Moura, Caroline G. B. de Tonetta, Denise Oliveira Jr, Ernandes S. Araújo, Fabiana Rust, Felipe Piñeiro-Guerra, Juan M. Mendonça Jr, Jurandir R. Medeiros, Leonardo R. Pinheiro, Lorena Miranda, Marcela Costa, Mariana R. A. Melo, Michaela L. Nobre, Regina L. G. Benevides, Thiago Roland, Fábio Klein, Jeroen de Barros, Nathan O. Mendonça, Raquel Huszar, Vera L. M. Kosten, Sarian High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir |
| description |
Recent studies from temperate lakes indicate that eutrophic systems tend to emit
less carbon dioxide (CO2) 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 CO (518 2 ± 182 mg C m−2 1 d− ). 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 |
| format |
article |
| author |
Becker, Vanessa Almeida, Rafael M. Nóbrega, Gabriel N. Junger, Pedro C. Figueiredo, Aline V. Andrade, Anízio S. Moura, Caroline G. B. de Tonetta, Denise Oliveira Jr, Ernandes S. Araújo, Fabiana Rust, Felipe Piñeiro-Guerra, Juan M. Mendonça Jr, Jurandir R. Medeiros, Leonardo R. Pinheiro, Lorena Miranda, Marcela Costa, Mariana R. A. Melo, Michaela L. Nobre, Regina L. G. Benevides, Thiago Roland, Fábio Klein, Jeroen de Barros, Nathan O. Mendonça, Raquel Huszar, Vera L. M. Kosten, Sarian |
| author_facet |
Becker, Vanessa Almeida, Rafael M. Nóbrega, Gabriel N. Junger, Pedro C. Figueiredo, Aline V. Andrade, Anízio S. Moura, Caroline G. B. de Tonetta, Denise Oliveira Jr, Ernandes S. Araújo, Fabiana Rust, Felipe Piñeiro-Guerra, Juan M. Mendonça Jr, Jurandir R. Medeiros, Leonardo R. Pinheiro, Lorena Miranda, Marcela Costa, Mariana R. A. Melo, Michaela L. Nobre, Regina L. G. Benevides, Thiago Roland, Fábio Klein, Jeroen de Barros, Nathan O. Mendonça, Raquel Huszar, Vera L. M. Kosten, Sarian |
| author_sort |
Becker, Vanessa |
| title |
High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir |
| title_short |
High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir |
| title_full |
High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir |
| title_fullStr |
High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir |
| title_full_unstemmed |
High Primary Production Contrasts with Intense Carbon Emission in a Eutrophic Tropical Reservoir |
| title_sort |
high primary production contrasts with intense carbon emission in a eutrophic tropical reservoir |
| publisher |
Frontiers Media |
| publishDate |
2020 |
| url |
https://repositorio.ufrn.br/handle/123456789/30890 |
| work_keys_str_mv |
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