Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin
We examined the factors controlling the variability in water-column respiration rates in Amazonian rivers. Our objectives were to determine the relationship between respiration rates and the in situ concentrations of the size classes of organic carbon (OC), and the biological source (C 3 and C 4 pla...
| Autor principal: | Ellis, Erin E. |
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| Outros Autores: | Richey, Jeffrey E., Aufdenkampe, Anthony K., Krusche, Alex Vladimir, Quay, Paul D., Salimon, Cleber Ibraim, Cunhae, Hilandia Brandão da |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Limnology and Oceanography
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/18076 |
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oai:repositorio:1-18076 |
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dspace |
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oai:repositorio:1-18076 Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin Ellis, Erin E. Richey, Jeffrey E. Aufdenkampe, Anthony K. Krusche, Alex Vladimir Quay, Paul D. Salimon, Cleber Ibraim Cunhae, Hilandia Brandão da Carbon Cycle Concentration (composition) Dissolved Oxygen Organic Carbon Oxygen Isotope Particulate Organic Matter Photosynthesis Phytoplankton Primary Production Regression Analysis Respiration Water Column Amazon Basin We examined the factors controlling the variability in water-column respiration rates in Amazonian rivers. Our objectives were to determine the relationship between respiration rates and the in situ concentrations of the size classes of organic carbon (OC), and the biological source (C 3 and C 4 plants and phytoplankton) of organic matter (OM) supporting respiration. Respiration was measured along with OC size fractions and dissolved oxygen isotopes (δ 18O-O 2) in rivers of the central and southwestern Amazon Basin. Rates ranged from 0.034 μmol O 2 L -1 h -1 to 1.78 μmol O 2 L -1 h -1, and were four-fold higher in rivers with evidence of photosynthetic production (demonstrated by δ 18O-O 2,<24.2%) as compared to rivers lacking such evidence (δ 18O-O 2.24.2%; 1.35±0.22 vs. 0.30±0.29 μmol L -1 h -1). Rates were likely elevated in the former rivers, which were all sampled during low water, due to the stimulation of heterotrophic respiration via the supply of a labile, algal-derived substrate and/or the occurrence of autotrophic respiration. The organic composition of fine particulate OM (FPOM) of these rivers is consistent with a phytoplankton origin. Multiple linear regression analysis indicates that [FPOC], C:N FPOC ratios, and [O 2] account for a high amount of the variability in respiration rates (r 2=0.80). Accordingly, FPOC derived from algal sources is associated with elevated respiration rates. The δ 13C of respiration-derived CO 2 indicates that the role of phytoplankton, C 3 plants, and C 4 grasses in supporting respiration is temporally and spatially variable. Future scaling work is needed to evaluate the significance of phytoplankton production to basin-wide carbon cycling. © 2012, by the Association for the Sciences of Limnology and Oceanography, Inc. 2020-06-15T21:51:28Z 2020-06-15T21:51:28Z 2012 Artigo https://repositorio.inpa.gov.br/handle/1/18076 10.4319/lo.2012.57.2.0527 en Volume 57, Número 2, Pags. 527-540 Restrito Limnology and Oceanography |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Carbon Cycle Concentration (composition) Dissolved Oxygen Organic Carbon Oxygen Isotope Particulate Organic Matter Photosynthesis Phytoplankton Primary Production Regression Analysis Respiration Water Column Amazon Basin |
| spellingShingle |
Carbon Cycle Concentration (composition) Dissolved Oxygen Organic Carbon Oxygen Isotope Particulate Organic Matter Photosynthesis Phytoplankton Primary Production Regression Analysis Respiration Water Column Amazon Basin Ellis, Erin E. Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin |
| topic_facet |
Carbon Cycle Concentration (composition) Dissolved Oxygen Organic Carbon Oxygen Isotope Particulate Organic Matter Photosynthesis Phytoplankton Primary Production Regression Analysis Respiration Water Column Amazon Basin |
| description |
We examined the factors controlling the variability in water-column respiration rates in Amazonian rivers. Our objectives were to determine the relationship between respiration rates and the in situ concentrations of the size classes of organic carbon (OC), and the biological source (C 3 and C 4 plants and phytoplankton) of organic matter (OM) supporting respiration. Respiration was measured along with OC size fractions and dissolved oxygen isotopes (δ 18O-O 2) in rivers of the central and southwestern Amazon Basin. Rates ranged from 0.034 μmol O 2 L -1 h -1 to 1.78 μmol O 2 L -1 h -1, and were four-fold higher in rivers with evidence of photosynthetic production (demonstrated by δ 18O-O 2,<24.2%) as compared to rivers lacking such evidence (δ 18O-O 2.24.2%; 1.35±0.22 vs. 0.30±0.29 μmol L -1 h -1). Rates were likely elevated in the former rivers, which were all sampled during low water, due to the stimulation of heterotrophic respiration via the supply of a labile, algal-derived substrate and/or the occurrence of autotrophic respiration. The organic composition of fine particulate OM (FPOM) of these rivers is consistent with a phytoplankton origin. Multiple linear regression analysis indicates that [FPOC], C:N FPOC ratios, and [O 2] account for a high amount of the variability in respiration rates (r 2=0.80). Accordingly, FPOC derived from algal sources is associated with elevated respiration rates. The δ 13C of respiration-derived CO 2 indicates that the role of phytoplankton, C 3 plants, and C 4 grasses in supporting respiration is temporally and spatially variable. Future scaling work is needed to evaluate the significance of phytoplankton production to basin-wide carbon cycling. © 2012, by the Association for the Sciences of Limnology and Oceanography, Inc. |
| format |
Artigo |
| author |
Ellis, Erin E. |
| author2 |
Richey, Jeffrey E. Aufdenkampe, Anthony K. Krusche, Alex Vladimir Quay, Paul D. Salimon, Cleber Ibraim Cunhae, Hilandia Brandão da |
| author2Str |
Richey, Jeffrey E. Aufdenkampe, Anthony K. Krusche, Alex Vladimir Quay, Paul D. Salimon, Cleber Ibraim Cunhae, Hilandia Brandão da |
| title |
Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin |
| title_short |
Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin |
| title_full |
Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin |
| title_fullStr |
Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin |
| title_full_unstemmed |
Factors controlling water-column respiration in rivers of the central and southwestern Amazon Basin |
| title_sort |
factors controlling water-column respiration in rivers of the central and southwestern amazon basin |
| publisher |
Limnology and Oceanography |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18076 |
| _version_ |
1787141934525972480 |
| score |
11.755432 |