"Workshop" diversidade taxonômica e padrões de distribuição das Angiospermas brasileiras: introdução

Giulietti, Ana María; Forero, Enrique

doi:10.1590/s0102-33061990000100001

Cited by 21 publications

(20 citation statements)

References 3 publications

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“…Nascimento, dados não publicados). Esta mata, assim como a Mata do Carvão, teve sua área bem reduzida no passado em função de desmatamentos para plantio de monocultura da cana-de-açúcar e de pastagens e outros impactos antrópicos, como a retirada de lenha e o corte seletivo, seguindo o padrão geral de degradação observado para as matas do domínio atlântico (Giulietti & Forero 1990). Assim, o alto número de árvores com DAP entre 10 e 20 cm e o baixo valor de área basal total por hectare, muito provavelmente, são reflexo destas perturbações.…”

Section: Resultsunclassified

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Fitossociologia de um remanescente de mata sobre tabuleiros no norte do estado do Rio de Janeiro (Mata do Carvão)

Silva¹,

Nascimento²

2001

Rev. bras. Bot.

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-(Phytosociological studies in a remnant lowland forest on tertiary "tabuleiros" in the north Rio de Janeiro State). The forests on Barreiras formations are located in fragmented areas extending from the Rio Grande do Norte State to north of Rio de Janeiro State. In the north of Rio de Janeiro State, the "Mata do Carvão" (1053 ha) is the largest remaining fragment. This study describes the structure and floristic composition of a remnant forest on tertiary tabuleiros and its main aim was to compare this forest with other "tabuleiro" and Atlantic forest remnants in the region. To carry out the inventory, four plots of 50 x 50 m were allocated in a selected area without vestiges of logging activities or fire. All trees ≥ 10 cm DBH were sampled and numbered with aluminium tags. Dead trees were measured but not tagged. A total of 564 trees was sampled being distributed within 34 families. The families with higher number of species were Leguminosae (18), Myrtaceae (8), and Euphorbiaceae (6). The most abundant families were Rutaceae (189), Leguminosae (97) and Euphorbiaceae (47). The species with higher cover index values were Metrodorea brevifolia, Paratecoma peroba and Pseudopiptadenia contorta. Although the "Mata do Carvão" showed lower tree diversity (H' = 3.21) than those found for other semi-deciduous seasonal forests, it has a high species similarity between the tabuleiro forests of South Bahia and North of Espírito Santo. In the "Mata do Carvão", the occurrence of rare species at risk of extinction (e.g. Paratecoma peroba) was observed. Furthermore, these are new occurrences for the Rio de Janeiro State (Centrolobium sclerophyllum and Polygala pulcherrima).RESUMO -(Fitossociologia de um remanescente de mata sobre tabuleiros no norte do Estado do Rio de Janeiro). As formações florestais sobre tabuleiros terciários ocorrem hoje na forma de pequenos fragmentos desde o Rio Grande do Norte até o Rio de Janeiro. No norte fluminense, a Mata do Carvão (1.053 ha) é o maior remanescente. Este trabalho descreve a estrutura e a composição florística desta mata, tendo por objetivo compará-la com outras matas da região. Foram estabelecidas quatro parcelas de 50 m x 50 m em uma área selecionada, sem vestígios de corte e de fogo. Todas as árvores com DAP ≥ 10 cm foram amostradas e plaqueadas. Árvores mortas foram medidas mas não plaqueadas. Um total de 564 árvores foram amostradas. Foram encontradas 34 famílias, sendo as de maior número de espécies Leguminosae (18), Myrtaceae (8) e Euphorbiaceae (6). As famílias mais abundantes foram Rutaceae (189), Leguminosae (97) e Euphorbiaceae (47). As espécies com maior índice de valor de cobertura (IVC) foram Metrodorea brevifolia, Paratecoma peroba e Pseudopiptadenia contorta. Embora a Mata do Carvão tenha uma diversidade (H' = 3,21 nats) menor que outras matas estacionais semidecíduas (ex. mata de tabuleiro de Linhares), ela possui uma alta similaridade de espécies arbóreas com as matas de tabuleiro do sul da Bahia e do norte do Espírito Santo. Na Mata do Carvão foi observad...

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Section: Resultsunclassified

“…As matas sobre tabuleiros terciários sofreram uma intensa fragmentação, com o processo de desmatamento na costa brasileira durante a colonização e, mais recentemente ) com a agricultura e com a industrialização (Rizzini 1979, Giulietti & Forero 1990). Ainda hoje podem-se encontrar áreas de retirada ilegal de madeiras nestas formações.…”

Section: Introductionunclassified

Fitossociologia de um remanescente de mata sobre tabuleiros no norte do estado do Rio de Janeiro (Mata do Carvão)

Silva¹,

Nascimento²

2001

Rev. bras. Bot.

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“…We compared these estimates with thresholds of 'collection density' (numbers of herbarium specimens per 100 km 2 ) commonly cited for sampling sufficiency in tropical countries (Campbell 1989) and (Shepherd 2003), and with equivalent figures at global level and for other tropical countries where national flora initiatives are already in progress. We also compared the totals for Brazilian herbaria to equivalent figures reported by Sobral & Stehmann (2009) for 1990and 2006 to provide an estimate of rates of growth in specimen numbers over the past 25 years. We analysed the totals for Brazilian herbaria by region to estimate collection densities for areas of scale more comparable to those of other national Flora projects and compared the resulting totals to equivalent data compiled from Index Herbariorum by Barbosa & Peixoto (2003).…”

Section: Sampling Sufficiencymentioning

confidence: 99%

Flora of Brazil Online: Can Brazil's botanists achieve their 2020 vision?

Morim

Lughadha

2015

Rodriguésia

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This paper seeks to provide an assessment of the prospects of delivering an online Flora of Brazil by 2020. Our approach is to evaluate the nature and extent of documentation of the Brazilian flora over the past 15 years before exploring whether existing botanical documentation and capacity is sufficient to support the production of a complete Flora over a five-year period. We address the following 'headline' questions: Has a high proportion of Brazilian species been described? Are collection densities sufficient to underpin a national Flora? Is there sufficient botanical expertise available to execute such a big project over a five-year period? Are there current taxonomic treatments that support the development of a national Flora? The results obtained show that the proportion of the flora estimated to have been described is high enough to be confident that those preparing Flora treatments will not be overwhelmed by the numbers of species new to science requiring description; the national average of 1.08 specimens per km2 is significant; relevant taxonomic treatments with a variety of different scopes and geographic scales are available; and, finally the botanical expertise available is demonstrated by the results presented in the List of Species of the Flora of Brasil.

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“…The biota of the isolated, humid brejo forests of north‐east Brazil have interested biologists for many years and have played a part in the continuing effort to understand the historical biogeography and possible migration routes between the major forest biomes of Amazonia and Atlantic Brazil (for example, Andrade‐Lima, 1953, 1966, 1982; Ducke, 1959; Prance, 1973; Vanzolini, 1973; Ab'Sáber, 1982; Bigarella & Andrade‐Lima, 1982; Lourenço, 1988; Giulietti & Forero, 1990; Ledru, 1991, 1993; Oliveira‐Filho & Ratter, 1995; Behling, 1998; Oliveira, Barreto & Suguio, 1999; Barreto, Pessenda & Suguio, 2002; Borges‐Nojosa & Caramaschi, 2003; Costa, 2003; Cavalcanti & Tabarelli, 2004; Pôrto, Cabral & Tabarelli, 2004; Vasconcelos, Almeida & Costa, 2004). Despite the destructive impact of human activity, these two large forest regions are dominating features of South American biogeography, and continue to be the focus of baseline botanical exploration.…”

Section: Introductionmentioning

confidence: 99%

Genetic variation in natural populations ofAnthurium sinuatumandA. pentaphyllumvar.pentaphyllum(Araceae) from north-east Brazil using AFLP molecular markers

Andrade¹,

Mayo²,

Berg³

et al. 2009

Botanical Journal of the Linnean Society

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Genetic variation was investigated using AFLP markers in 12 populations of Anthurium sinuatum and A. pentaphyllum var. pentaphyllum (Araceae) in north-east Brazil, Amazonia and the Brazilian Atlantic forest. Two unique genetic patterns characterized the populations of A. sinuatum as a group, but no correlation between genetic and geographical interpopulation distance was found; the Amazonian population was not separated from that in Ceará. The isolated Ceará brejo populations of A. sinuatum were genetically distinct, but genetic diversity levels were similar to populations elsewhere, with no evidence of genetic erosion. Anthurium pentaphyllum populations were significantly different from each other; Bayesian genetic structural analysis found no common genetic pattern, but revealed genetic clusters unique to subgroups and individual populations in the Atlantic forest and French Guiana. Anthurium pentaphyllum and A. sinuatum can be distinguished genetically, but individuals of both species formed intermediate genetic clusters that blurred their distinction. We suggest that genetic mixing of A. sinuatum and A. pentaphyllum has occurred in north-east Brazil, possibly connected with cycles of humid forest expansion. The weak genetic structure in A. sinuatum is consistent with the natural fragmentation of continuous forest areas, possibly during the Holocene. This study highlights the scientific importance of the highly threatened brejo forests for tropical American biogeography.

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"Workshop" diversidade taxonômica e padrões de distribuição das Angiospermas brasileiras: introdução

Cited by 21 publications

References 3 publications

Fitossociologia de um remanescente de mata sobre tabuleiros no norte do estado do Rio de Janeiro (Mata do Carvão)

Fitossociologia de um remanescente de mata sobre tabuleiros no norte do estado do Rio de Janeiro (Mata do Carvão)

Flora of Brazil Online: Can Brazil's botanists achieve their 2020 vision?

Genetic variation in natural populations ofAnthurium sinuatumandA. pentaphyllumvar.pentaphyllum(Araceae) from north-east Brazil using AFLP molecular markers

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