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Cited by 172Peatlands and Wetlands EcologySoil and Water Nutrient DynamicsWater Quality and Resources Studies

An anoxic event and other biogeochemical effects of the Pantanal wetland on the Paraguay River

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Hamilton, Stephen K., Sippel, Suzanne J., Calheiros, DÓbora F., Melack, John M.·1997·Limnology and Oceanography
DOI 10.4319/lo.1997.42.2.0257
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Abstract

The Paraguay River was sampled throughout the annual cycle at two sites located downriver from most of the Pantanal, and major tributaries were occasionally sampled close to their entry into the Pantanal. The floodplains strongly modulate the discharge regime and substantially reduce runoff by enhancing evapotranspirative losses. Contact of the river water with the floodplain results in depletion of dissolved O 2, oversaturation of CO 2 and CH 4 loss of suspended sediments, and reduced export of N and P. Oxygen depletion and associated chemical changes are most marked when river water first contacts the floodplain; in 1995, the water remained anoxic throughout the river channel for 6 weeks, causing massive fish mortality. Bottle incubations showed that the rate of O 2 consumption by the river water during the anoxic event was high at first (7.2 µM h−1) but declined exponentially over several hours and was not stimulated by organic carbon and nutrient additions. The O 2 demand may be due largely to bacterial CH 4 oxidation; the concentration of CH 4 in the river was particularly high (∼31 µ M) at the time of the incubations. The O 2 depletion corresponded with higher concentrations of most major ions, Si, and dissolved organic carbon but was not accompanied by elevated concentrations of inorganic N and P, H 2 S, or most of the 46 dissolved trace elements that were measured. In contrast to O 2 depletion and associated chemical changes, sediment retention by the floodplains was greatest at maximum river stages. Most chemical weathering of minerals seems to take place in the upland drainage basins rather than on the floodplains, and most major solutes display conservative mixing in the river‐floodplain system.

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  • This phenomenon can already be found in natural ecosystems such as the lakes of the Pantanal of Mato Grosso, where huge fish kills occur when the first rainfalls strip terrestrially deposited organic matter.

    “This phenomenon can already be found in natural ecosystems such as the lakes of the Pantanal of Mato Grosso, where huge fish kills occur when the first rainfalls strip terrestrially deposited, organic matter [124,125].”

    From Urban Stream and Wetland Restoration in the Global South—A DPSIR Analysis (2019) · cites this paper as [124]

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Research works printed but not linked: 7

  1. M.S. thesis, Univ. $20 Paulo. 87 p.
  2. CALHEIROS, D. E, AND S. K. HAMIL~TON. 1996. Limnological con- ditions associated with natural fish kills in the Pantanal wetland (Baia do Castelo, Paraguay River, Brazil). Int. Ver. Theor. An- gew. Limnol. Verh. In press.
  3. DA SILVA, C. J. 1990. Influence of water level variation on the structure and function of an area subject to flooding in the Pantanal of Mato Gross0 (Pantanal of Barao de Melgago, Mu- nicipality of Santo Antonio de Leverger e Barao de Melgaqo, MT) [in Portuguese]. Ph.D. thesis, Univ. $20 Carlos. 251 p.
  4. HAMILTON, S. K. 1994. Aquatic biogeochemistry of the Orinoco River floodplain (Venezuela) and the Pantanal wetland (Brazil), Ph.D. thesis, Univ. Calif. Santa Barbara. 236 p. - 0. CORRBA DE SOUZA, AND M. E. COUTINHO. 1996. Dy- namics of floodplain inundation in the alluvial fan of the Ta- 19395590, 1997, 2, Downloaded from https://aslopubs.onlinelibrary.wiley.com/doi/10.4319/lo.1997.42.2.0257 by Readcube (Labtiva Inc.), Wiley Online Library on [15/08/2023]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License · DOI
  5. quari River (Pantanal, Brazil). Int. Ver. Theor. Angew. Limnol. Verh. In press.
  6. STUMM, W., AND J. J. MORGAN. 1981. Aquatic chemistry, 2nd ed. Wiley.
  7. WETZEL, F:. G. 1983. Limnology, 2nd ed. Saunders. A!VD G. E. LIKENS. 199 1. Limnological analyses, 2nd ed. Spiinger. Submitted: 8 January 1996 Accepted: 12 August I996 Amended: 11 December 1996

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Authors
Hamilton, S. K., Sippel, S. J., Calheiros, D. F., & Melack, J. M.
Affiliations
  • University of California, Santa Barbara (US)
  • Embrapa (BR)
  • University of California System (US)
ORCID
Venue
Limnology and Oceanography
Publisher
Wiley
Published
1997-03
Volume
42
Issue
2
Pages
257-272
ISSN
  • 0024-3590 (ISSN-L)
  • 1939-5590
DOI
10.4319/lo.1997.42.2.0257
OpenAlex
W2114899567
Cited by
172
References
41
Citations by year
2026: 1 · 2025: 3 · 2024: 5 · 2023: 2 · 2022: 9 · 2021: 6 · 2020: 7 · 2019: 7 · 2018: 3 · 2017: 5 · 2016: 8 · 2015: 7 · 2014: 15 · 2013: 9 · 2012: 10
FWCI
6.12
Type
journal article
Language
en
Open access
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 2487 d)
Locations
Limnology and Oceanography (publishedVersion)
Funders
National Aeronautics and Space Administration
Topics
  • Physical Sciences › Environmental Science › Ecology › Peatlands and Wetlands Ecology
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
  • Physical Sciences › Environmental Science › Water Science and Technology › Water Quality and Resources Studies
Keywords
Pantanal, Paraguay River, anoxic events, river-floodplain interaction, dissolved oxygen depletion, methane oxidation, dissolved methane, dissolved organic carbon, sediment trapping, nutrient export, chemical weathering, fish mortality, dissolved trace elements, major ions, annual cycle

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