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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
06/07/1998 |
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Data da última atualização: |
28/03/2017 |
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Autoria: |
GRAHAM, A. A. |
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Título: |
Siltation of stone-surface periphyton in rivers by clay-sized particles from low concentrations in suspension. |
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Ano de publicação: |
1990 |
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Fonte/Imprenta: |
Hydrobiologia, v.199, p.107-115, 1990. |
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Idioma: |
Inglês |
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Conteúdo: |
The observation that deposits of fine sediment are found on stream beds only in areas slower water velocity promotes a common misunderstanding of the depositional behaviour of fine suspensoids in flowing water and a disregard for the potential for siltation effects on the biota on the surface of stones in fast flowing water. A model for deposition from turbulent water, whereby particles are lost from suspension where water currents are slowed by boundary friction, provides an explanation for silt infiltration into epilithic periphyton. Theoretically calculated deposition rates of clay sized mineral particles at low suspended concentrations (2 to 5 g m-3) were found to account for observed rates of silt accumulation in epilithic periphyton in a braided river in the South Island of New Zealand. At concentrations between 1 and 10 g m-3 of suspendend mineral silt during normal flow, silt accumulation in epilithic periphyton accounted for about 50% of its dry weight. This caused reduction in the mean organic content of the periphyton to 22% of the dry weight compared to 52% in a reference stream where the concentration of suspended mineral particles was less than 1.0 g m-3 during non-freshet flow. This reduction in proportional organic content is discussed in terms of diminished food value of the periphyton and potential interactions between periphyton and invertebrate consumers. |
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Palavras-Chave: |
Turbider; Turbidy. |
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Thesagro: |
Argila; Perifiton; Rio. |
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Thesaurus Nal: |
periphyton; rivers; silt. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01958naa a2200217 a 4500
001 1792746
005 2017-03-28
008 1990 bl --- 0-- u #d
100 1 $aGRAHAM, A. A.
245 $aSiltation of stone-surface periphyton in rivers by clay-sized particles from low concentrations in suspension.
260 $c1990
520 $aThe observation that deposits of fine sediment are found on stream beds only in areas slower water velocity promotes a common misunderstanding of the depositional behaviour of fine suspensoids in flowing water and a disregard for the potential for siltation effects on the biota on the surface of stones in fast flowing water. A model for deposition from turbulent water, whereby particles are lost from suspension where water currents are slowed by boundary friction, provides an explanation for silt infiltration into epilithic periphyton. Theoretically calculated deposition rates of clay sized mineral particles at low suspended concentrations (2 to 5 g m-3) were found to account for observed rates of silt accumulation in epilithic periphyton in a braided river in the South Island of New Zealand. At concentrations between 1 and 10 g m-3 of suspendend mineral silt during normal flow, silt accumulation in epilithic periphyton accounted for about 50% of its dry weight. This caused reduction in the mean organic content of the periphyton to 22% of the dry weight compared to 52% in a reference stream where the concentration of suspended mineral particles was less than 1.0 g m-3 during non-freshet flow. This reduction in proportional organic content is discussed in terms of diminished food value of the periphyton and potential interactions between periphyton and invertebrate consumers.
650 $aperiphyton
650 $arivers
650 $asilt
650 $aArgila
650 $aPerifiton
650 $aRio
653 $aTurbider
653 $aTurbidy
773 $tHydrobiologia$gv.199, p.107-115, 1990.
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Florestas; Embrapa Solos. |
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Data corrente: |
05/02/2010 |
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Data da última atualização: |
22/03/2010 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
RESENDE, A. S. de; CURCIO, G. R.; BONNET, A.; CAPECHE, C. L.; MACEDO, J. R. de; CAMPELLO, E. F. C.; BALIEIRO, F. de C. |
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Afiliação: |
ALEXANDER SILVA DE RESENDE, CNPAB; GUSTAVO RIBAS CURCIO, CNPF; ANNETE BONNET, Bióloga autônoma; CLAUDIO LUCAS CAPECHE, CNPS; JOSE RONALDO DE MACEDO, CNPS; EDUARDO FRANCIA CARNEIRO CAMPELLO, CNPAB; FABIANO DE CARVALHO BALIEIRO, CNPS. |
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Título: |
Estratégias de plantio para o "Corredor Ecológico COMPERJ". |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: BONNET, A.; RESENDE, A. S. de; CURCIO, G. R. (Org.). Manual de plantio de espécies nativas para o "Corredor Ecológico COMPERJ". Seropédica: Embrapa Agrobiologia; Colombo: Embrapa Florestas; Rio de Janeiro: Embrapa Solos, 2009. |
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Páginas: |
p. 99-110. |
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Idioma: |
Português |
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Palavras-Chave: |
Comperj; Plantio florestal. |
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Thesagro: |
Plantio; Reflorestamento. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00837naa a2200241 a 4500
001 1661986
005 2010-03-22
008 2009 bl uuuu u00u1 u #d
100 1 $aRESENDE, A. S. de
245 $aEstratégias de plantio para o "Corredor Ecológico COMPERJ".
260 $c2009
300 $ap. 99-110.
650 $aPlantio
650 $aReflorestamento
653 $aComperj
653 $aPlantio florestal
700 1 $aCURCIO, G. R.
700 1 $aBONNET, A.
700 1 $aCAPECHE, C. L.
700 1 $aMACEDO, J. R. de
700 1 $aCAMPELLO, E. F. C.
700 1 $aBALIEIRO, F. de C.
773 $tIn: BONNET, A.; RESENDE, A. S. de; CURCIO, G. R. (Org.). Manual de plantio de espécies nativas para o "Corredor Ecológico COMPERJ". Seropédica: Embrapa Agrobiologia; Colombo: Embrapa Florestas; Rio de Janeiro: Embrapa Solos, 2009.
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Embrapa Florestas (CNPF) |
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