As zonas costeiras acolhem quadros de alta riqueza e relevância ecológica que as qualificam como importante ecossistema para conservação. O objetivo deste estudo foi listar as espécies que compõem a restinga da praia do Paiva e descrever a sua fisionomia. A área de restinga compreende 147 ha, situa-se no Município do Cabo de Santo Agostinho, PE, sob as coordenadas 08º07'30"S e 35º00'55"W. As coletas florísticas foram realizadas durante 28 meses, em todos os estratos. O solo foi classificado como Neossolo Quartzarênico; foram determinadas duas fisionomias: a floresta não-inundável e o fruticeto aberto não-inundável. Foram listadas 124 espécies, distribuídas em 103 gêneros e 55 famílias. As famílias com maior número de espécies foram Myrtaceae, com 11 espécies, Cyperaceae (10), Fabaceae (8), Euphorbiaceae (7), Rubiaceae (6) e Asteraceae (5). As espécies Anacardium occidentale, Tapirira guianensis, Chamaecrista ramosa, Protium heptaphyllum, Byrsonima sericea, Myrcia rotundifolia e Marlierea schotti são encontradas na maioria das restingas do Nordeste. No entanto, devido à incipiência dos estudos na Região não foram verificadas espécies endêmicas.
Whether aging forest fragments are able to recover original assemblages or progressively move toward impoverished successional stages remains as an open question. This study tested the hypothesis that seedling assemblages in forest fragments differ from those across mature forest stands and examined to what extent the uncovered patterns supported the notion that edge‐affected habitats tend to support impoverished tree assemblages dominated by pioneer species. We contrasted a series of small forest remnants (3–91 ha) to old‐growth stands located in the largest (ca 3500 ha) and best preserved forest remnant in northeastern Brazil and found that tree seedling assemblages inhabiting forest fragments exhibited reduced species richness (up to 50%) at different spatial scales in comparison to seedling assemblages in mature forest and adult assemblages in both fragments and mature forest stands. Moreover, ordination analyses clearly segregated fragment seedling assemblages in taxonomic/functional terms and segregation correlated to the richness of pioneer species. Seedlings of pioneer species and those bearing medium‐sized seeds (0.6–1.5 cm) increased in fragments, whereas large‐seeded species (1.5–3.0 cm) were reduced by more than a half. Such a multiple‐scale replacement of the old‐growth flora by pioneers was also confirmed by an indicator species analysis and the resulting pioneer indicator species. Our results suggest that small forest fragments support impoverished and distorted seedling assemblages. This floristic/functional drift implies that forest remnants or edge‐affected habitats tend to be dominated by a small set of pioneer tree species rather than supporting a substantial portion of the old‐growth flora as do mature forest stands.
RESUMO -(Flora vascular e perfil fisionômico de uma restinga no litoral sul de Pernambuco, Brasil). Este estudo apresenta um levantamento florístico e a caracterização dos diferentes tipos fisionômicos de uma restinga localizada no município de Tamandaré, em Pernambuco, além de analisar a similaridade de sua flora com outras restingas ao longo do litoral nordestino.
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