In:
Limnology and Oceanography Letters, Wiley, Vol. 3, No. 3 ( 2018-06), p. 265-274
Abstract:
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% ± 22% and 104% ± 36% of CO 2 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.
Type of Medium:
Online Resource
ISSN:
2378-2242
,
2378-2242
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2876718-4
