Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2018-08-21T13:03:26Z No. of bitstreams: 1 2010 - Wagner Francisco de Oliveira.pdf: 15558282 bytes, checksum: 81e96e77a201d54d5d633b2f7bd0354f (MD5) / Made available in DSpace on 2018-08-21T13:03:26Z (GMT). No. of bitstreams: 1 2010 - Wagner Francisco de Oliveira.pdf: 15558282 bytes, checksum: 81e96e77a201d54d5d633b2f7bd0354f (MD5) Previous issue date: 2010-03-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior, CAPES, Brasil. / Habitats characteristic of the Brazilian coast, the restingas are ecosystems associated with the Atlantic Forest Domain and are characterized by having mesoclimatic conditions considered extreme, and suffer from intense human pressure. Nevertheless, they have great biological diversity, the Bromeliaceae being one of the most representative of these habitats. This study aimed to evaluate the composition, richness and assemblage structure of Bromeliaceae in two areas of restinga located on the island of Marambaia, Mangaratiba, RJ. We established 50 plots of 100 m2 on each of two areas: the Restinga of Praia da Arma??o (RPA) and the Restinga da Praia Grande (RPG). These plots were placed in lines parallel to the beach with 10 meters apart. In each plot were recorded richness and abundance of epiphytic and terrestrial bromeliads and measured the morphometric characteristics of the host tree, as well as vertical and horizontal distributions of epiphytic species. We sampled 11 species of bromeliads and three new records for Marambaia, bringing the richness of this locality for 21 species of Bromeliaceae, considered a high value of wealth. Most of the species is included on some level of threat according to IUCN, which characterizes the Marambaia Island as an important conservation site for the family. The Island had low similarity with other areas of restinga of Rio de Janeiro and this can be attributed to its geographical location in relation to these areas and the fact it is an island region. Neoregelia cruenta and Tillandsia stricta are the most abundant and are the ones with the highest frequency of occurrence, which is directly related to different reproductive strategies of these species. The specific physiological needs, like dispersion and structural complexity of habitat caused if there were differences in the occupation of phorophytes by epiphytic species. Already aggregated distribution of all species is related to the mechanism of occupation of the environment used by plants and the quality of different substrates provided by the environment and the host tree. In general, the species tend to avoid the sampling units in accordance mainly with the heterogeneity of the habitat but, however, tend to co-exist in phorophytes once occupied the height classes differently. In this study, none of the morphometric parameters of the host tree explained the variations in the parameters of assemblage richness and abundance of bromeliads, indicating that other variables should better explain these relationships. / H?bitats caracter?sticos do litoral brasileiro, as restingas s?o ecossistemas associados ao Dom?nio da Floresta Atl?ntica e caracterizam-se por apresentar condi??es mesoclim?ticas consideradas extremas, al?m de sofrer com intensa a??o antr?pica. Apesar disso, possuem grande diversidade biol?gica, sendo a fam?lia Bromeliaceae uma das mais representativas nestes habitats. Este estudo visou avaliar a composi??o, riqueza e a estrutura da taxocenose de Bromeliaceae em duas ?reas de restinga localizadas na Ilha da Marambaia, Mangaratiba, RJ. Foram estabelecidas 50 parcelas de 100 m2 em cada uma das duas ?reas: a restinga da Praia da Arma??o (RPA) e a restinga da Praia Grande (RPG). Estas parcelas foram alocadas em linhas paralelas ? praia distando 10 m entre si. Em cada parcela foram registradas a riqueza e a abund?ncia de brom?lias terrestres e ep?fitas e mensuradas as caracter?sticas morfom?tricas dos for?fitos, e bem como as distribui??es vertical e horizontal das esp?cies ep?fitas. Foram amostradas 11 esp?cies de brom?lias e tr?s novas ocorr?ncias para a Marambaia, elevando a riqueza desta localidade para 21 esp?cies de Bromeliaceae, considerado um valor alto de riqueza. A maior parte das esp?cies amostradas est? inclu?da em algum n?vel de amea?a segundo a UICN, o que caracteriza a Ilha da Marambaia como um importante s?tio de conserva??o para a fam?lia. A Ilha apresentou baixa similaridade com outras ?reas de restinga do RJ e isto pode ser atribu?do a sua localiza??o geogr?fica em rela??o a estas ?reas e ao fato de se tratar de uma regi?o insular. Neoregelia cruenta e Tillandsia stricta s?o as mais abundantes e s?o as que possuem os maiores valores de freq??ncia de ocorr?ncia, fato que est? diretamente relacionado ?s estrat?gias reprodutivas diferenciadas destas esp?cies. As necessidades fisiol?gicas espec?ficas, forma de dispers?o e a complexidade estrutural do h?bitat fizeram com que houvesse diferen?as na ocupa??o dos for?fitos pelas esp?cies ep?fitas. J? a distribui??o agregada de todas as esp?cies est? relacionada ao mecanismo de ocupa??o do ambiente utilizado pelas plantas e pela qualidade diferenciada dos substratos oferecidos pelo ambiente e pelos for?fitos. De uma forma geral, as esp?cies tendem a se evitar nas unidades amostrais de acordo, principalmente, com a heterogeneidade do h?bitat mas, no entanto, tendem a co-existir nos for?fitos uma vez que ocupam as classes de altura de forma diferenciada. Neste estudo, nenhum dos par?metros morfom?tricos do for?fito explicou as varia??es dos par?metros de riqueza e abund?ncia da taxocenose de Bromeliaceae, indicando que outras vari?veis devem explicar melhor essas rela??es.