Spatial distribution of seeds and juveniles of Enterolobium glaziovii Bentham (Leguminosae, Mimosoideae) in the Atlantic forest, Brazil
Os padrões de distribuição espacial de frutos e juvenis de Enterobium glaziovii Bentham foram avaliados em quatro parcelas circulares de 30 m de raio, centralizadas em uma árvore reprodutiva para determinar se o tamanho das copas das plantas parentais, topografia e cobertura de dossel influenciam es...
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| Veröffentlicht in: | Acta botânica brasilica Jg. 19; H. 3; S. 609 - 614 |
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Sociedade Botânica do Brasil
01.09.2005
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| Abstract | Os padrões de distribuição espacial de frutos e juvenis de Enterobium glaziovii Bentham foram avaliados em quatro parcelas circulares de 30 m de raio, centralizadas em uma árvore reprodutiva para determinar se o tamanho das copas das plantas parentais, topografia e cobertura de dossel influenciam esses padrões. Cada copa foi subdividida em oito triângulos irregulares e suas áreas calculadas. Cada parcela foi subdividida em quatro sub-parcelas, sendo duas nos terrenos inclinados para cima e duas nos inclinados para baixo. A cobertura de dossel de cada parcela foi estimada tanto na altura do peito (1,30 m), quanto na altura do chão, a cada três meses em 1998. O número de frutos e juvenis de E. glaziovii foi quantificado. Apesar de ter havido mais frutos debaixo da copa da arvore parental (F1,12 = 0.01; p = 0,92), não houve diferenças no número de juvenis embaixo ou fora da copa da planta parental (F1,12 = 0,88; p = 0,36). Houve correlação positiva entre a área das copas e o número de frutos e juvenis embaixo delas (r = 0,62; df = 14; p < 0,05). A maioria dos frutos e juvenis foi encontrada nos terrenos inclinados para baixo. A cobertura de dossel foi menor na primavera, porém maior embaixo da copa das plantas reprodutivas (apenas na altura do peito). Esses resultados indicam que a copa das plantas parentais, topografia e cobertura de dossel influenciam o padrão de distribuição espacial e provavelmente também a dinâmica de sementes e juvenis de E. glaziovii.
The spatial distribution of fruits and juveniles of Enterolobium glaziovii Bentham were evaluated in four circular plots of 30 m radius, centered around reproductive individuals to determine whether the size of the parental crowns, topography, and canopy coverage influence these patterns. Each crown was subdivided into eight irregular triangles and the area of each was calculated. Each plot was subdivided into four sub-plots, two of them in an up-slope direction, and the other two in a down-slope direction. The canopy coverage for each plot was estimated at breast height (1.30 m) and at ground level, every three months during 1998. The numbers of fruits and juveniles of E. glaziovii were recorded. Although there were more fruit under the parental crown (F1,12 = 0.01; p = 0.92), there was no difference in the number of juveniles under and beyond the reproductive trees (F1,12 = 0.88; p = 0.36). There was a positive correlation between the areas of the crowns and the numbers of fruits and juveniles under them (r = 0.62; df = 14; p < 0.05). Most of the fruits and juveniles were found in the down-slope directions. The canopy coverage was lower in spring, but higher under parental crowns (only at breast height). These results indicate that the parental crown, topography and canopy coverage influenced the pattern of spatial distribution and probably also the dynamics of E. glaziovii seeds and juveniles. |
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| AbstractList | The spatial distribution of fruits and juveniles of Enterolobium glaziovii Bentham were evaluated in four circular plots of 30 m radius, centered around reproductive individuals to determine whether the size of the parental crowns, topography, and canopy coverage influence these patterns. Each crown was subdivided into eight irregular triangles and the area of each was calculated. Each plot was subdivided into four sub-plots, two of them in an up-slope direction, and the other two in a down-slope direction. The canopy coverage for each plot was estimated at breast height (1.30 m) and at ground level, every three months during 1998. The numbers of fruits and juveniles of E. glaziovii were recorded. Although there were more fruit under the parental crown (F1,12 = 0.01; p = 0.92), there was no difference in the number of juveniles under and beyond the reproductive trees (F1,12 = 0.88; p = 0.36). There was a positive correlation between the areas of the crowns and the numbers of fruits and juveniles under them (r = 0.62; df = 14; p < 0.05). Most of the fruits and juveniles were found in the down-slope directions. The canopy coverage was lower in spring, but higher under parental crowns (only at breast height). These results indicate that the parental crown, topography and canopy coverage influenced the pattern of spatial distribution and probably also the dynamics of E. glaziovii seeds and juveniles.
Os padrões de distribuição espacial de frutos e juvenis de Enterobium glaziovii Bentham foram avaliados em quatro parcelas circulares de 30 m de raio, centralizadas em uma árvore reprodutiva para determinar se o tamanho das copas das plantas parentais, topografia e cobertura de dossel influenciam esses padrões. Cada copa foi subdividida em oito triângulos irregulares e suas áreas calculadas. Cada parcela foi subdividida em quatro sub-parcelas, sendo duas nos terrenos inclinados para cima e duas nos inclinados para baixo. A cobertura de dossel de cada parcela foi estimada tanto na altura do peito (1,30 m), quanto na altura do chão, a cada três meses em 1998. O número de frutos e juvenis de E. glaziovii foi quantificado. Apesar de ter havido mais frutos debaixo da copa da arvore parental (F1,12 = 0.01; p = 0,92), não houve diferenças no número de juvenis embaixo ou fora da copa da planta parental (F1,12 = 0,88; p = 0,36). Houve correlação positiva entre a área das copas e o número de frutos e juvenis embaixo delas (r = 0,62; df = 14; p < 0,05). A maioria dos frutos e juvenis foi encontrada nos terrenos inclinados para baixo. A cobertura de dossel foi menor na primavera, porém maior embaixo da copa das plantas reprodutivas (apenas na altura do peito). Esses resultados indicam que a copa das plantas parentais, topografia e cobertura de dossel influenciam o padrão de distribuição espacial e provavelmente também a dinâmica de sementes e juvenis de E. glaziovii. Os padrões de distribuição espacial de frutos e juvenis de Enterobium glaziovii Bentham foram avaliados em quatro parcelas circulares de 30 m de raio, centralizadas em uma árvore reprodutiva para determinar se o tamanho das copas das plantas parentais, topografia e cobertura de dossel influenciam esses padrões. Cada copa foi subdividida em oito triângulos irregulares e suas áreas calculadas. Cada parcela foi subdividida em quatro sub-parcelas, sendo duas nos terrenos inclinados para cima e duas nos inclinados para baixo. A cobertura de dossel de cada parcela foi estimada tanto na altura do peito (1,30 m), quanto na altura do chão, a cada três meses em 1998. O número de frutos e juvenis de E. glaziovii foi quantificado. Apesar de ter havido mais frutos debaixo da copa da arvore parental (F1,12 = 0.01; p = 0,92), não houve diferenças no número de juvenis embaixo ou fora da copa da planta parental (F1,12 = 0,88; p = 0,36). Houve correlação positiva entre a área das copas e o número de frutos e juvenis embaixo delas (r = 0,62; df = 14; p < 0,05). A maioria dos frutos e juvenis foi encontrada nos terrenos inclinados para baixo. A cobertura de dossel foi menor na primavera, porém maior embaixo da copa das plantas reprodutivas (apenas na altura do peito). Esses resultados indicam que a copa das plantas parentais, topografia e cobertura de dossel influenciam o padrão de distribuição espacial e provavelmente também a dinâmica de sementes e juvenis de E. glaziovii. The spatial distribution of fruits and juveniles of Enterolobium glaziovii Bentham were evaluated in four circular plots of 30 m radius, centered around reproductive individuals to determine whether the size of the parental crowns, topography, and canopy coverage influence these patterns. Each crown was subdivided into eight irregular triangles and the area of each was calculated. Each plot was subdivided into four sub-plots, two of them in an up-slope direction, and the other two in a down-slope direction. The canopy coverage for each plot was estimated at breast height (1.30 m) and at ground level, every three months during 1998. The numbers of fruits and juveniles of E. glaziovii were recorded. Although there were more fruit under the parental crown (F1,12 = 0.01; p = 0.92), there was no difference in the number of juveniles under and beyond the reproductive trees (F1,12 = 0.88; p = 0.36). There was a positive correlation between the areas of the crowns and the numbers of fruits and juveniles under them (r = 0.62; df = 14; p < 0.05). Most of the fruits and juveniles were found in the down-slope directions. The canopy coverage was lower in spring, but higher under parental crowns (only at breast height). These results indicate that the parental crown, topography and canopy coverage influenced the pattern of spatial distribution and probably also the dynamics of E. glaziovii seeds and juveniles. |
| Author | Santos, Flavio A.M.(Universidade de Campinas Instituto de Biologia Departamento de Botânica) Ramos, Flavio Nunes(Universidade de Campinas Instituto de Biologia Departamento de Botânica) Matos, Dalva M. Silva(UNIRIO Departamento de Ciências Naturais) |
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| References_xml | – volume: 28 start-page: 82 issn: 0006-3606 year: 1996 ident: ref12 article-title: Spatial and temporal variation of seed rain in a tropical lowland wet forest publication-title: Biotropica doi: 10.2307/2388773 – volume: 7 start-page: 559 year: 1996 ident: ref13 article-title: Establishment and growth of Quercus floribunda seedlings after a mast year publication-title: Journal of Vegetation Science doi: 10.2307/3236305 – volume: 70 start-page: 16031609 issn: 0012-9658 year: 1988 ident: ref17 article-title: Seed and early seedling predation in the forest understory and in treefall gaps publication-title: Ecology – volume: 24 start-page: 146 issn: 0006-3606 year: 1992 ident: ref4 article-title: Regeneration ecology of Eperua grandiflora (Caesalpinaceae), a large-seeded tree in French Guyana publication-title: Biotropica doi: 10.2307/2388668 – year: 1996 ident: ref21 – volume: 19 start-page: 32 issn: 0006-3606 year: 1987 ident: ref15 article-title: Variación espacial y temporal en la depredación de semillas de Copaifera pubiflora (Leguminosae: Caesalpinoideae) en Venezuela publication-title: Biotropica doi: 10.2307/2388457 – volume: 66 start-page: 781 issn: 0012-9658 year: 1985 ident: ref7 article-title: Early consequences of seed dispersal for a neotropical tree (Virola surinamensis) publication-title: Ecology doi: 10.2307/1940539 – year: 1981 ident: ref9 – volume: 1 start-page: 165 year: 1988 ident: ref14 article-title: Contaminação por chumbo na serrapilheira do Parque Nacional da Tijuca - RJ publication-title: Acta Botânica Brasílica doi: 10.1590/S0102-33061987000300016 – volume: 107 start-page: 347 issn: 0029-8549 year: 1996 ident: ref11 article-title: Ficus seed shadow in a Bornean rain forest publication-title: Oecologia doi: 10.1007/BF00328451 – year: 1996 ident: ref16 – volume: 82 start-page: 319 issn: 0022-0477 year: 1994 ident: ref20 article-title: Treefalls, crown asymmetry, and buttresses publication-title: Journal of Ecology doi: 10.2307/2261299 – volume: 12 start-page: 220222 issn: 0006-3606 year: 1980 ident: ref2 article-title: Notes on the seedling ecology of a large-seeded species of Bombacaceae publication-title: Biotropica doi: 10.2307/2387975 – volume: 64 start-page: 315 issn: 0012-9615 year: 1994 ident: ref6 article-title: Recruitment of a mast-fruiting, bird dispersed tree: bridging frugivore activity and seedling establishment publication-title: Ecological Monographs doi: 10.2307/2937165 – volume: 21 start-page: 115 issn: 0006-3606 year: 1989 ident: ref3 article-title: La regénération naturelle dúne espèce autochore de la forêt guyanaise: Eperua falcata Aublet (Caesalpinaceae) publication-title: Biotropica doi: 10.2307/2388702 – year: 1981 ident: ref8 – volume: 124 start-page: 769 issn: 0003-0147 year: 1984 ident: ref1 article-title: Spacing dynamics of a tropical rain forest tree: evaluation of the Janzen-Connell model publication-title: American Naturalist doi: 10.1086/284316 – volume: 24 start-page: 408 issn: 0006-3606 year: 1992 ident: ref5 article-title: Seed removal and seed fate in Gustavia superba (Lecythidaceae) publication-title: Biotropica doi: 10.2307/2388611 – volume: 104 start-page: 501 issn: 0003-0147 year: 1970 ident: ref10 article-title: Herbivores and the number of tree species in tropical forest publication-title: American Naturalist doi: 10.1086/282687 – volume: 24 start-page: 503511 issn: 0006-3606 year: 1992 ident: ref18 article-title: Spatial and temporal patterns of light and canopy structure in a lowland tropical moist forest publication-title: Biotropica doi: 10.2307/2389012 – year: 1991 ident: ref19 |
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| Snippet | Os padrões de distribuição espacial de frutos e juvenis de Enterobium glaziovii Bentham foram avaliados em quatro parcelas circulares de 30 m de raio,... The spatial distribution of fruits and juveniles of Enterolobium glaziovii Bentham were evaluated in four circular plots of 30 m radius, centered around... |
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| Title | Spatial distribution of seeds and juveniles of Enterolobium glaziovii Bentham (Leguminosae, Mimosoideae) in the Atlantic forest, Brazil |
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