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Search Results: 1 - 10 of 16319 matches for " Cogliatti-Carvalho "
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Spatial distribution and preferential substrate of Neoregelia johannis (Carriére) L.B. Smith (Bromeliaceae) in a disturbed area of Atlantic Rainforest at Ilha Grande, RJ, Brazil
COGLIATTI-CARVALHO, LUCIANA;ROCHA, CARLOS F.D.;
Brazilian Journal of Botany , 2001, DOI: 10.1590/S0100-84042001000400004
Abstract: in bromeliad populations, amount of light and available substrates influence individuals spatial organization. in atlantic rainforest of ilha grande, the heliophylous bromeliad neoregelia johannis is a large and abundant species. in this forest, it would be expected that n. johannis would occupy stable substrates, as large trunks, large branches, rock boulders or ground, with high sunlight, enough for the bromeliad survivor. in the present work, we analyzed the distribution and most used substrates of n. johannis in secondary forest. we analyzed the frequency of reproductive modes (sexual and vegetative) used by the bromeliad shoots, registering if the shoots were originated from seeds or by vegetative reproduction. the results indicated an aggregated distribution pattern (ip = 0.052). the preferred substrate was boulders (91%), whereas tree trunks (6%) and the ground (3%) were rarely used. small and fragile substrates are unstable to support large adults of this species, which may explain the predominant pattern of establishment over boulders within the secondary forest, as the presence of this substrate also results in more opened canopy cover. approximately 50% of young individuals entered the population by vegetative reproduction. we conclude that the preferential habit and the aggregated distribution of n. johannis are due to the conjunction of preferred substrate with higher amount of light resulting from breaks in tree canopy over areas with rock blocks, and high frequency of recruitment by vegetative reproduction.
Spatial distribution and preferential substrate of Neoregelia johannis (Carriére) L.B. Smith (Bromeliaceae) in a disturbed area of Atlantic Rainforest at Ilha Grande, RJ, Brazil
COGLIATTI-CARVALHO LUCIANA,ROCHA CARLOS F.D.
Brazilian Journal of Botany , 2001,
Abstract: In bromeliad populations, amount of light and available substrates influence individuals spatial organization. In Atlantic Rainforest of Ilha Grande, the heliophylous bromeliad Neoregelia johannis is a large and abundant species. In this forest, it would be expected that N. johannis would occupy stable substrates, as large trunks, large branches, rock boulders or ground, with high sunlight, enough for the bromeliad survivor. In the present work, we analyzed the distribution and most used substrates of N. johannis in secondary forest. We analyzed the frequency of reproductive modes (sexual and vegetative) used by the bromeliad shoots, registering if the shoots were originated from seeds or by vegetative reproduction. The results indicated an aggregated distribution pattern (Ip = 0.052). The preferred substrate was boulders (91%), whereas tree trunks (6%) and the ground (3%) were rarely used. Small and fragile substrates are unstable to support large adults of this species, which may explain the predominant pattern of establishment over boulders within the secondary forest, as the presence of this substrate also results in more opened canopy cover. Approximately 50% of young individuals entered the population by vegetative reproduction. We conclude that the preferential habit and the aggregated distribution of N. johannis are due to the conjunction of preferred substrate with higher amount of light resulting from breaks in tree canopy over areas with rock blocks, and high frequency of recruitment by vegetative reproduction.
Distribui??o espacial de bromélias na restinga de jurubatiba, Macaé, RJ
Freitas, André F. N.;Cogliatti-Carvalho, Luciana;Van Sluys, Monique;Rocha, Carlos Frederico D.;
Acta Botanica Brasilica , 2000, DOI: 10.1590/S0102-33062000000200005
Abstract: in "restingas", because favorable microhábitats have patchy distribution, and due to the high vegetative reproduction rate in bromeliads, we tested the hypothesis that the pattern of spatial distribution of bromeliads in a "restinga" habitat would be aggregated. we used the "restinga" of the parque nacional da restinga de jurubatiba as our hypothesis test area. we analyzed the spatial distribution pattern of each studied species using morisita dispersion index (id). we found 10 bromeliad species, with 10179 individuals in the 0,98 ha sampled. in the study area, nine species had an aggregated distribution pattern (id > 1). we suggest that the aggregated distribution pattern of bromeliads may be explained by the rate of vegetative reproduction, distribution of the favorable abiotic conditions and availability substrates in clumps, which occur in patches in the study area, favoring the bromeliads occurrence.
Species composition of Bromeliaceae and their distribution at the Massambaba restinga in Arraial do Cabo, Rio de Janeiro, Brazil
Rocha-Pess?a, TC.;Nunes-Freitas, AF.;Cogliatti-Carvalho, L.;Rocha, CFD.;
Brazilian Journal of Biology , 2008, DOI: 10.1590/S1519-69842008000200005
Abstract: we studied some ecological parameters such as richness, abundance, density, biomass and variation in species composition in four vegetation zones and in a zone with anthropic disturbance in the massambaba restinga in arraial do cabo, rio de janeiro state. we sampled 100 plots of 100 m2 (10 x 10 m) recording the bromeliad species and their abundance. we found a total of seven bromeliad species, with vriesea neoglutinosa (5647 ramets) and tillandsia stricta (1277 ramets) being the most abundant. the vegetation zone called clusia shrubs had the highest richness (s = 5) and density (6360 ramets.ha-1) of bromeliads. the differences found in abundance and variation in species composition among vegetation zones seems to be related to the vegetation structure of each zone.
Volume de água armazenado no tanque de bromélias, em restingas da costa brasileira
Cogliatti-Carvalho, Luciana;Rocha-Pess?a, Thereza Christina;Nunes-Freitas, André Felippe;Rocha, Carlos Frederico Duarte;
Acta Botanica Brasilica , 2010, DOI: 10.1590/S0102-33062010000100009
Abstract: many bromeliad species store rain water in tanks, as a result of the spiraled distribution of their leaves. the aim of this study was to evaluate how much water is stored and what is the maximum volume of water possible to be stored in different tank-bromeliad species in 13 different brazilian restingas. the species were recorded in 100 plots of 100 m2, in each restinga habitat. for each bromeliad species, the effective and the maximum water stored in the tanks were measured. we found 32 tank-bromeliad species and 59,007 bromeliad rosettes, with a maximum volume estimated in 44,388 liters, and approximately 17,000 liters of effective water stored. we found interspecific difference in effective and maximum volume of water stored. aechmea aquilega, a. blanchetiana and hohenbergia castelanosii had the highest effective water volume stored in their tanks. only a. nudicaulis and billbergia amoena showed differences among their populations in all analyzed parameters. the restingas of maricá, prado, trancoso and jurubatiba had the highest volumes.ha-1 of water stored inside bromeliad tanks. the maximum water volume stored in the bromeliad tanks varied among species due to morphological differences in shape and size parameters.
Bromeliaceae da restinga da Reserva Biológica Estadual da Praia do Sul: composi??o, abundancia e similaridade da comunidade
Nunes-Freitas, André Felippe;Rocha-Pess?a, Thereza Christina;Cogliatti-Carvalho, Luciana;Rocha, Carlos Frederico Duarte;
Acta Botanica Brasilica , 2006, DOI: 10.1590/S0102-33062006000300020
Abstract: the praia do sul state biological reserve (ilha grande, rj) is an important remnant of restinga habitat in rio de janeiro state. restinga vegetation is not homogeneous and it is distributed in different vegetation zones, each zone having different topography, physiognomy and flora. we analyzed ecological parameters of the bromeliad community such as richness, abundance, density, biomass and variation in species composition in four vegetation zones. we sampled 150 plots of 100 m2 (10×10 m), distributed in the four vegetation zones, recording the bromeliad species and their abundance, and measuring the height, dbh, and density of the trees. we tested differences in ramet abundance and vegetation complexity between the four vegetation zones with anova followed by tukey's test. we found a total of 16 bromeliad species, with different abundances and distribution patterns between the four vegetation zones, and with significant differences in abundance between species. the data indicate that the high species richness found in the biological reserve is related to local heterogeneity and complexity. the differences found between vegetation zones seem to be related to the vegetation structure of each zone.
Varia??o na estrutura e na composi??o de Bromeliaceae em cinco zonas de restinga no Parque Nacional da Restinga de Jurubatiba, Macaé, RJ
COGLIATTI-CARVALHO, LUCIANA;FREITAS, ANDRé FELIPPE NUNES DE;ROCHA, CARLOS FREDERICO DUARTE DA;VAN SLUYS, MONIQUE;
Brazilian Journal of Botany , 2001, DOI: 10.1590/S0100-84042001000100001
Abstract: we studied the bromeliads at the jurubatiba national park in five vegetation zones: psamophilous halophilous creeper vegetation (phr); closed rear beach (fpp); open shrubby clusia (aac); open shrubby ericaceae (aae) and temporarily flooded forest (mpi). we sampled 98 plots of 100 m2 (10 x 10 m) recording the bromeliad species and abundance, density, mass, richness, species diversity, evenness, and similarity among the zones. we estimated the amount of water reserved inside the bromeliads in each zone and by bromeliad species. we found a total of ten bromeliad species at the jurubatiba national park that occurred differently along the vegetation zones, with a total density of 10386 ind.ha-1. no bromeliads were found in the phr zone. the fpp zone had the highest total mass (7721.2 kg.ha-1) and bromelia antiacantha was the most abundant, having the highest mass (1366.5 kg.ha-1). the aae zone had the highest total bromeliad density (15725 ind.ha-1), the highest bromeliad diversity (h?= 2.358), evenness (0.786) and amount of water reserved inside bromeliads (3294.8 l.ha-1). in the mpi zone, aechmea bromeliifolia was the most abundant, being found exclusively in this zone. the highest similarity occurred between zones aac and aae (88.9%). we conclude that the structure and composition of the bromeliads at the jurubatiba national park varied consistently among the vegetation zones of the restinga, and each zone is characterised by a different set of dominant bromeliads and different abundance distribution.
Varia o na estrutura e na composi o de Bromeliaceae em cinco zonas de restinga no Parque Nacional da Restinga de Jurubatiba, Macaé, RJ
COGLIATTI-CARVALHO LUCIANA,FREITAS ANDRé FELIPPE NUNES DE,ROCHA CARLOS FREDERICO DUARTE DA,VAN SLUYS MONIQUE
Brazilian Journal of Botany , 2001,
Abstract: Estudamos as bromeliáceas do Parque Nacional da Restinga de Jurubatiba, Macaé, RJ, nas cinco diferentes zonas de vegeta o: psamófila halófila reptante (PHR), fechada pós-praia (FPP), arbustiva aberta de Clusia (AAC), arbustiva aberta de ericácea (AAE) e mata periodicamente inundada (MPI). Analisamos abundancia, densidade, biomassa, riqueza, diversidade, equitabilidade e similaridade de espécies entre as zonas. Estimamos a quantidade de água reservada no interior das bromélias por zona de restinga e por espécie de bromélia. Em 98 parcelas de 100 m2 (10 X 10 m) cada, registramos as espécies de bromélias, a abundancia de cada espécie e a zona amostrada. A quantidade de água armazenada e a biomassa das bromélias foram estimadas medindo-se o volume de água reservada no vaso e pesando 10 indivíduos por espécie. Encontramos 10 espécies na restinga de Jurubatiba, com densidade total estimada de 10386 ind.ha-1. Na zona PHR, n o ocorreu nenhuma espécie de bromélia. Na FPP, ocorreu a maior biomassa total (7721,2 kg.ha-1), sendo Bromelia antiacantha a mais abundante e com maior biomassa (1366,5 kg.ha-1). Na AAE, ocorreu a maior densidade total (15725 ind.ha-1), diversidade (H' = 2,358), equitabilidade (0,786) e quantidade de água reservada no interior de bromélias (3294,8 L.ha-1). Na MPI, Aechmea bromeliifolia foi a mais abundante, sendo exclusiva desta zona. A maior similaridade ocorreu entre AAC e AAE (88,9%). Concluímos que a estrutura e a composi o de Bromeliaceae da restinga de Jurubatiba variam fortemente entre as zonas estudadas, com cada zona possuindo um conjunto particular de espécies com diferentes distribui es de abundancia.
Bromeliaceae species from coastal restinga habitats, Brazilian states of Rio de Janeiro, Espírito Santo, and Bahia.
Cogliatti-Carvalho, L.,Rocha-Pess?a, T. C.,Nunes-Freitas, A. F.,Rocha, C. F. D.
Check List , 2008,
Abstract: Bromeliaceae is one of the most representative plant families in restinga habitats. We analyzed the speciesrichness and composition of Bromeliaceae in 13 restinga habitats along the Brazilian coast. We found a total of 41species distributed along the restinga habitats studied. The restinga of Praia do Sul, in the state of Rio de Janeiro, hadthe highest number of species (15), whereas the restinga of Abaeté, in the state of Bahia, had the lowest (4). Our dataare suggestive that the Doce River may represent the limit of distribution for some bromeliad species, with some speciesoccurring only south of that river and others occurring only to the north of it. The differences in Bromeliaceae speciescomposition among restinga habitats probably are not only due to differences in local environmental conditions, butalso due to the geographic distribution pattern of each species and to the present degree of disturbance at each restinga.
Una escala alternativa para cuantificar la intensidad de la deficiencia de P en trigo
Manfreda,V.T.; Cogliatti,D.H.;
Agriscientia , 2006,
Abstract: the response of sixteen growth variables to internal p concentration were examined in wheat plants with the aim to establish the basis for an objetive qualification of p-deficiency intensity. two experiments were carried out with wheat plants grown in pots under outdoor and greenhouse conditions. in a first experiment, two wheat genotypes were used and the variables were determined at two harvest times (27 and 32 days after germination, ddg). in a second, only one genotype was used and 18 harvests were performed between 14 and 30 ddg. crítical p levels (nc) were estimated by mathematical fitting of each variable to the whole plant p-concentration. variables were ordered by 1) standarized nc, calculated as the variable nc divided by nc for whole plant biomass (ncrel), and 2) dry biomass obtained at each nc as the percentage of the dry biomass achieved at non limiting p doses (bsp%). both criteria arrived at similar variable ranks in terms of sensibility to p-stress, supporting a proposed p-stress intensity scale.
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