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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Velocity-amplified microbial respiration rates in the lower Amazon River

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Ward, Nicholas D. [1, 2, 3] ; Sawakuchi, Henrique O. [1, 4] ; Neu, Vania [5] ; Less, Diani F. S. [6] ; Valerio, Aline M. [7] ; Cunha, Alan C. [6] ; Kampel, Milton [7] ; Bianchi, Thomas S. ; Krusche, Alex V. [4] ; Richey, Jeffrey E. [1] ; Keil, Richard G. [1]
Total Authors: 11
[1] Univ Washington, Sch Oceanog, Seattle, WA 98195 - USA
[2] Univ Florida, Dept Geol Sci, Gainesville, FL 32611 - USA
[3] Pacific Northwest Natl Lab, Marine Sci Lab, Sequim, WA 98382 - USA
[4] Univ Sao Paulo, Ctr Energia Nucl Agr, Sao Paulo - Brazil
[5] Univ Fed Rural Amazonia, Inst Socio Ambiental & Recursos Hidr, Belem, Para - Brazil
[6] Univ Fed Amapa, Dept Meio Ambiente & Desenvolvimento, Macapa, Amapa - Brazil
[7] Inst Nacl Pesquisas Espaciais, Div Sensoriamento Remoto, Sao Paulo - Brazil
Total Affiliations: 7
Document type: Journal article
Source: LIMNOLOGY AND OCEANOGRAPHY LETTERS; v. 3, n. 3, SI, p. 265-274, JUN 2018.
Web of Science Citations: 6

Most measurements of respiration rates in large tropical rivers do not account for the influence of river flow conditions on microbial activity. We developed a ship-board spinning incubation system for measuring O-2 drawdown under different rotation velocities and deployed the system along the lower Amazon River during four hydrologic periods. Average respiration rates in incubation chambers rotated at 0.22 m s(-1) and 0.66 m s(-1) were 1.4 and 2.4 times higher than stationary chambers, respectively. On average, depth-integrated respiration rates in chambers spun at 0.22 m s(-1) and 0.66 m s(-1) accounted for 64%+/- 622% and 104%+/- 636% of CO2 outgassing rates, respectively, in mainstem sites. Continuous measurements of in situ pCO(2) were also made along with cross-channel profiles of river velocity. A positive correlation between river velocity and pCO(2) was observed along the lower river (r(2)=0.67-0.96) and throughout a tidal cycle. (AU)

FAPESP's process: 08/58089-9 - The role of rivers on the regional carbon cycle
Grantee:Maria Victoria Ramos Ballester
Support type: Research Program on Global Climate Change - Thematic Grants