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Registro Completo |
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Biblioteca(s): |
Embrapa Agroindústria Tropical. |
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Data corrente: |
17/08/1993 |
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Data da última atualização: |
17/08/1993 |
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Autoria: |
BACH, C. E. |
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Título: |
Effects of plant density and diversity on the population dynamics of a specialist herbivore, the Stiped cucumber beetle, Acalymma vittata (Fab.). |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
Ecology, v.61, n.6, p.1515-1530, 1980. |
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Idioma: |
Inglês |
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Conteúdo: |
ABSTRACT - To determine the effects or plant density and diversity on the population dynamics of a specialist herbivore, the striped cucumber beetle (Acalymma vittata [Fab.]), cucumbers (Cucumis sativus L.) were planted in monocultures and in polycultures with corn (Zea mays L.) and broccoli (Brassica oleracea L.). Population densities of A. vittata and its insect predators, as well as cucumber growth, survivorship, and reproduction were monitored in these experimental plots. By controlling total plant density, host plant density, and plant diversity, it was possible to distinguish the effects of these three confounding variables. Densities of A. vittata were 10-30 times greater in monocultures than in polycultures, both per plot and per plant, even when total plant density and host plant density were held constant. The lack of any effect of plant density on per-plot beetle abundances emphasized the importance of diversity per se in influencing beetle populations. These differences in beetle abundances caused by diversity resulted from differences in tenure time and movement patterns among plots, rather than from differences in colonization, reproduction, or predation. In mark-recapture studies, a greater proportion of beetles marked in monocultures than in polycultures was later found, and of those marked in monocultures, a greater number were later found in monocultures than in polycultures. All measures of growth (leaf area, growth rate, and vine length) and reproduction (fruit production and number ..) ... MenosABSTRACT - To determine the effects or plant density and diversity on the population dynamics of a specialist herbivore, the striped cucumber beetle (Acalymma vittata [Fab.]), cucumbers (Cucumis sativus L.) were planted in monocultures and in polycultures with corn (Zea mays L.) and broccoli (Brassica oleracea L.). Population densities of A. vittata and its insect predators, as well as cucumber growth, survivorship, and reproduction were monitored in these experimental plots. By controlling total plant density, host plant density, and plant diversity, it was possible to distinguish the effects of these three confounding variables. Densities of A. vittata were 10-30 times greater in monocultures than in polycultures, both per plot and per plant, even when total plant density and host plant density were held constant. The lack of any effect of plant density on per-plot beetle abundances emphasized the importance of diversity per se in influencing beetle populations. These differences in beetle abundances caused by diversity resulted from differences in tenure time and movement patterns among plots, rather than from differences in colonization, reproduction, or predation. In mark-recapture studies, a greater proportion of beetles marked in monocultures than in polycultures was later found, and of those marked in monocultures, a greater number were later found in monocultures than in polycultures. All measures of growth (leaf area, growth rate, and vine length) and reproduction ... Mostrar Tudo |
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Palavras-Chave: |
Acalymma vittata; Herbivoro; Inseto - dinamica populacional; Inseto - planta - relacao; Planta - densidade; Planta - diversidade; Planta - praga; Planta - reservas - concentracao. |
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Thesagro: |
Cucumis Sativus; Ecologia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02297naa a2200241 a 4500
001 1417717
005 1993-08-17
008 1980 bl --- 0-- u #d
100 1 $aBACH, C. E.
245 $aEffects of plant density and diversity on the population dynamics of a specialist herbivore, the Stiped cucumber beetle, Acalymma vittata (Fab.).
260 $c1980
520 $aABSTRACT - To determine the effects or plant density and diversity on the population dynamics of a specialist herbivore, the striped cucumber beetle (Acalymma vittata [Fab.]), cucumbers (Cucumis sativus L.) were planted in monocultures and in polycultures with corn (Zea mays L.) and broccoli (Brassica oleracea L.). Population densities of A. vittata and its insect predators, as well as cucumber growth, survivorship, and reproduction were monitored in these experimental plots. By controlling total plant density, host plant density, and plant diversity, it was possible to distinguish the effects of these three confounding variables. Densities of A. vittata were 10-30 times greater in monocultures than in polycultures, both per plot and per plant, even when total plant density and host plant density were held constant. The lack of any effect of plant density on per-plot beetle abundances emphasized the importance of diversity per se in influencing beetle populations. These differences in beetle abundances caused by diversity resulted from differences in tenure time and movement patterns among plots, rather than from differences in colonization, reproduction, or predation. In mark-recapture studies, a greater proportion of beetles marked in monocultures than in polycultures was later found, and of those marked in monocultures, a greater number were later found in monocultures than in polycultures. All measures of growth (leaf area, growth rate, and vine length) and reproduction (fruit production and number ..) ...
650 $aCucumis Sativus
650 $aEcologia
653 $aAcalymma vittata
653 $aHerbivoro
653 $aInseto - dinamica populacional
653 $aInseto - planta - relacao
653 $aPlanta - densidade
653 $aPlanta - diversidade
653 $aPlanta - praga
653 $aPlanta - reservas - concentracao
773 $tEcology$gv.61, n.6, p.1515-1530, 1980.
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Registro original: |
Embrapa Agroindústria Tropical (CNPAT) |
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