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Registro Completo
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
04/09/1997 |
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Data da última atualização: |
04/09/1997 |
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Autoria: |
HAMILTON, S. K.; SIPPEL, S. J.; CALHEIROS, D. F.; MELACK, J. M. |
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Afiliação: |
University of California. Marine Science Institute (Santa Barbara); EMBRAPA. Centro de Pesquisa Agropecuaria do Pantanal (Corumba, MS); University of California. Department Ecology, Evolution, Marine Biology. |
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Título: |
An anoxic event and other biogeochemical effects of the Pantanal wetland on Paraguay River. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Limnology and Oceanography, v.42, n.2, p.257-272, mar., 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
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 O2, oversaturatin of CO2 and CH4, 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 O2 consumption by tye river water during the anoxic event was high at first (7.2 uM h-1) but declined exponentially over several hours and was not stimulated by organic carbon and nutrient additions. The O2 demand may be due largely to bacterial CH4 oxidation; the concentration of CH4 in the river was particularly high (~31 uM) at the time of the incubations. The O2 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, H2, S, or most of the 46 dissolved trace elements that were measured. In contrast to O2 depletion and associated chemical changes, sediment retention by the floodplains was greatest at maximum river stages. ... MenosThe 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 O2, oversaturatin of CO2 and CH4, 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 O2 consumption by tye river water during the anoxic event was high at first (7.2 uM h-1) but declined exponentially over several hours and was not stimulated by organic carbon and nutrient additions. The O2 demand may be due largely to bacterial CH4 oxidation; the concentration of CH4 in the river was particularly high (~31 uM) at the time of the incubations. The O2 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, H2, S, or most of the 46 dissolved trace elements that were measured. In contrast to O2 depletion and associated chemical changes, sediment retention by the floodplains was greatest... Mostrar Tudo |
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Palavras-Chave: |
Corumba; Floodplain; Fluvial transport; Hidrology; Inundation; Porto Esperanca; Rio Paraguai. |
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Thesagro: |
Água; Bioquímica; Ecologia; Enchente; Hidrologia; Inundação; Sedimento; Transporte Fluvial. |
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Thesaurus NAL: |
biogeochemistry; ecology; Pantanal; sediments; water. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02543naa a2200397 a 4500
001 1791580
005 1997-09-04
008 1997 bl uuuu u00u1 u #d
100 1 $aHAMILTON, S. K.
245 $aAn anoxic event and other biogeochemical effects of the Pantanal wetland on Paraguay River.
260 $c1997
520 $aThe 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 O2, oversaturatin of CO2 and CH4, 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 O2 consumption by tye river water during the anoxic event was high at first (7.2 uM h-1) but declined exponentially over several hours and was not stimulated by organic carbon and nutrient additions. The O2 demand may be due largely to bacterial CH4 oxidation; the concentration of CH4 in the river was particularly high (~31 uM) at the time of the incubations. The O2 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, H2, S, or most of the 46 dissolved trace elements that were measured. In contrast to O2 depletion and associated chemical changes, sediment retention by the floodplains was greatest at maximum river stages. ...
650 $abiogeochemistry
650 $aecology
650 $aPantanal
650 $asediments
650 $awater
650 $aÁgua
650 $aBioquímica
650 $aEcologia
650 $aEnchente
650 $aHidrologia
650 $aInundação
650 $aSedimento
650 $aTransporte Fluvial
653 $aCorumba
653 $aFloodplain
653 $aFluvial transport
653 $aHidrology
653 $aInundation
653 $aPorto Esperanca
653 $aRio Paraguai
700 1 $aSIPPEL, S. J.
700 1 $aCALHEIROS, D. F.
700 1 $aMELACK, J. M.
773 $tLimnology and Oceanography$gv.42, n.2, p.257-272, mar., 1997.
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