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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
03/07/1997 |
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Data da última atualização: |
31/03/2017 |
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Autoria: |
ARCHER, S.; GARRETT, M. G.; DETLING, J. K. |
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Título: |
Rates of vegetation change associated with prairie dog (Cynomys ludovicianus) grazing in North American mixed-grass prairie. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
Vegetatio, v.72, n.3, p.159-166, 1987. |
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Idioma: |
Inglês |
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Conteúdo: |
A prairie dog (Cynomys ludovicianus) colony with a known history of habitation was studied to quantify the effects of herbivory on plants species composition, dominance, stature and diversity in a North American mixedgrass prairie. Gradient analysis was used to quantify the relationship between plant community structure, prairie dog density, burrow density and habitation history and to document community-level response of plants subjected to heavy grazing pressure. The results quantify the type, rate and extent of change which plant populations and communities may undergo in response to the differential grazing of plants variously tolerant of defoliation. Detrended correspondence analysis indicated that 69% of the between-sample floristic variance on the site was attributable to prairie dog habitation. Perennial grasses were rapidly displanced from the site within 3 yr of colonization and were replaced by annual forbs. The net result was an increase in species richness and diversity on the prairie dog colony. Within the colony, however, the number of species was more a function of stand size than colonization history. Significant decreases in canopy stature after 2 yr of habitation resulkted from replacement of mid-height grass species by shortgrass species and forbs. In addition, there was a shift from tall growth forms of off-colony species to dwarf growth forms of the same species on the colony. Decreases in litter and increases in bare soil cover were substatial during the first 2 yr of habitation but changed little thereafter. MenosA prairie dog (Cynomys ludovicianus) colony with a known history of habitation was studied to quantify the effects of herbivory on plants species composition, dominance, stature and diversity in a North American mixedgrass prairie. Gradient analysis was used to quantify the relationship between plant community structure, prairie dog density, burrow density and habitation history and to document community-level response of plants subjected to heavy grazing pressure. The results quantify the type, rate and extent of change which plant populations and communities may undergo in response to the differential grazing of plants variously tolerant of defoliation. Detrended correspondence analysis indicated that 69% of the between-sample floristic variance on the site was attributable to prairie dog habitation. Perennial grasses were rapidly displanced from the site within 3 yr of colonization and were replaced by annual forbs. The net result was an increase in species richness and diversity on the prairie dog colony. Within the colony, however, the number of species was more a function of stand size than colonization history. Significant decreases in canopy stature after 2 yr of habitation resulkted from replacement of mid-height grass species by shortgrass species and forbs. In addition, there was a shift from tall growth forms of off-colony species to dwarf growth forms of the same species on the colony. Decreases in litter and increases in bare soil cover were substatial during t... Mostrar Tudo |
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Palavras-Chave: |
Buchloe; Diversidade; Diversity; Estrutura; Herbivoro; Herbivory; Structure. |
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Thesaurus Nal: |
Agropyron; Bouteloua; Cynomys ludovicianus; Stipa. |
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Categoria do assunto: |
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Marc: |
LEADER 02295naa a2200277 a 4500
001 1791268
005 2017-03-31
008 1987 bl --- 0-- u #d
100 1 $aARCHER, S.
245 $aRates of vegetation change associated with prairie dog (Cynomys ludovicianus) grazing in North American mixed-grass prairie.
260 $c1987
520 $aA prairie dog (Cynomys ludovicianus) colony with a known history of habitation was studied to quantify the effects of herbivory on plants species composition, dominance, stature and diversity in a North American mixedgrass prairie. Gradient analysis was used to quantify the relationship between plant community structure, prairie dog density, burrow density and habitation history and to document community-level response of plants subjected to heavy grazing pressure. The results quantify the type, rate and extent of change which plant populations and communities may undergo in response to the differential grazing of plants variously tolerant of defoliation. Detrended correspondence analysis indicated that 69% of the between-sample floristic variance on the site was attributable to prairie dog habitation. Perennial grasses were rapidly displanced from the site within 3 yr of colonization and were replaced by annual forbs. The net result was an increase in species richness and diversity on the prairie dog colony. Within the colony, however, the number of species was more a function of stand size than colonization history. Significant decreases in canopy stature after 2 yr of habitation resulkted from replacement of mid-height grass species by shortgrass species and forbs. In addition, there was a shift from tall growth forms of off-colony species to dwarf growth forms of the same species on the colony. Decreases in litter and increases in bare soil cover were substatial during the first 2 yr of habitation but changed little thereafter.
650 $aAgropyron
650 $aBouteloua
650 $aCynomys ludovicianus
650 $aStipa
653 $aBuchloe
653 $aDiversidade
653 $aDiversity
653 $aEstrutura
653 $aHerbivoro
653 $aHerbivory
653 $aStructure
700 1 $aGARRETT, M. G.
700 1 $aDETLING, J. K.
773 $tVegetatio$gv.72, n.3, p.159-166, 1987.
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
27/03/2008 |
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Data da última atualização: |
16/06/2008 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Nacional - C |
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Autoria: |
OLIVEIRA FILHO, E. C.; PARRON, L. M. |
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Afiliação: |
Eduardo Cyrino Oliveira Filho, CPAC; Lucília Maria Parron, CPAC. |
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Título: |
Avaliação de qualidade das águas no Brasil: o Rio Preto examinado. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Espaço e Geografia, Brasília, v. 10, n. 2, p. 279-294, 2007. |
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Idioma: |
Português |
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Palavras-Chave: |
Ecotoxicologia. |
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Thesagro: |
Qualidade da Água. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00442naa a2200145 a 4500
001 1572059
005 2008-06-16
008 2007 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA FILHO, E. C.
245 $aAvaliação de qualidade das águas no Brasil$bo Rio Preto examinado.
260 $c2007
650 $aQualidade da Água
653 $aEcotoxicologia
700 1 $aPARRON, L. M.
773 $tEspaço e Geografia, Brasília$gv. 10, n. 2, p. 279-294, 2007.
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