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| Registros recuperados: 10 | |
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| Oliveira,Fabiola Ferreira; Batalha,Marco Antônio. |
| The lognormal distribution model is frequently found in communities, especially those which are rich in species and influenced by many environmental factors, as those of the cerrado. We tested the hypothesis that the abundance distribution of woody plant species in a cerrado fragment fits the lognormal model. We placed 20 lines in a cerrado fragment and sampled, with the point-quarter method, 800 individuals with stem perimeter equal or larger than 3 cm. We plotted the abundance-class histogram of the species, verified its normality with the Kolmogorov-Smirnov test, and estimated the expected number of woody species for this community. Of the 63 obtained species, Anadenanthera falcata (with 185 species), Eriotheca gracilipes (43), Stryphnodendron obovatum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abundance; Cerrado; Lognormal distribution; Savanna. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000100004 |
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| Batalha,Marco Antônio; Mantovani,Waldir. |
| We studied a 1225 ha area, composed mainly of cerrado, in Santa Rita do Passa Quatro, São Paulo State, southeastern Brazil (21°36-38'S, 47°36-39'W). In three cerrado physiognomies (campo cerrado -- a wooded savanna, cerrado sensu stricto -- a woodland, and cerradão -- a tall woodland), we collected all vascular plants in reproductive stage, and identified them to species level. We found 360 species, representing 236 genera and 69 families. The richest families were: Asteraceae, Fabaceae, Poaceae, and Rubiaceae. The savanna physiognomies were richer than the forest one. The ratio between herbaceous and woody species was approximately 2:1. We analysed the whole flora and its two components separately, woody and herbaceous, comparing them with other disjunct... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Savanna; Physiognomy; Floristics; Woody/herbaceous ratio. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062001000300001 |
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| Silva,Igor Aurélio; Cianciaruso,Marcus Vinicius; Batalha,Marco Antônio. |
| We examined the species abundance distribution (SAD) of plant communities in: (1) a wet grassland, waterlogged throughout most of the year; (2) a seasonal savanna, with an annual dry season; and (3) a hyperseasonal savanna, with alternating drought and waterlogging over the year. We searched for differences in the abundance distributions of all species, as well as of the common and rare species. We tested whether the SADs fitted the lognormal, log-series, power fraction, and random assortment models. We found that environmental constraints may reduce the evenness of plant communities and change the SADs in savannas. We observed a lognormal abundance distribution in the wet grassland and a random abundance distribution in the hyperseasonal cerrado. The SAD... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Assembly rules; Cerrado; Environmental filter; Evenness; Relative abundance distribution. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000200011 |
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| Batalha,Marco Antônio. |
| É importante definirmos corretamente um termo, porque pode haver implicações práticas e imediatas. Dois conceitos importantes para serem definidos acuradamente são os de "cerrado" e de "bioma". Da maneira como vem sendo usado no Brasil, o conceito de bioma adquiriu erroneamente uma conotação florística. Na verdade, o conceito de bioma é similar ao de formação vegetal, mas leva em conta a associação da vegetação com a fauna e com os microrganismos. Assim, por um lado, o conceito de bioma é fisionômico e funcional, isto é, levam-se em conta a aparência geral da vegetação e aspectos como os ritmos de crescimento e reprodução; por outro, o conceito não é florístico, isto é, a afinidade taxonômica das espécies que aparecem em várias unidades de um mesmo bioma é... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fisionomia; Savana; Terminologia; Formação vegetal. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000100001 |
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| Registros recuperados: 10 | |
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