1 research outputs found
PROPAGULES DISPERSAL SYNDROMES AND THE INFLUENCE OF THE AMAZON FOREST IN THE COMPOSITION OF WOODY SPECIES IN A COASTAL SANDBANK IN THE NORTHERN BRAZILIAN COAST
Este estudo teve o objetivo de caracterizar as sĂndromes de dispersĂŁo da vegetação lenhosa de uma floresta de restinga na AmazĂ´nia (APA de Algodoal-Maiandeua, Pará) e estabelecer relações fitogeográficas sobre a origem desta flora a partir do compartilhamento de espĂ©cies com outras restingas do litoral brasileiro e a floresta amazĂ´nica. Com base na distribuição em classes de altura dos indivĂduos as espĂ©cies foram classificadas em dois estratos, inferior (abaixo de 5 m) e superior (igual ou acima de 5 m). Foram registradas 84 espĂ©cies em 35 famĂlias botânicas, com diversidade (H´) de 3,78 nat ind-1 . A principal sĂndrome de dispersĂŁo corresponde Ă zoocoria com 89% das espĂ©cies (74), seguida de autocoria, 6% (5) e anemocoria com 5% (4) das espĂ©cies. A análise de similaridade florĂstica com outras restingas ao longo do litoral brasileiro aponta a um padrĂŁo de proximidade geográfica, sendo mais similar com as restingas do nordeste, sudeste e sul. Em relação Ă floresta amazĂ´nica, mais da metade (60%) das espĂ©cies foram comuns as duas tipologias de vegetação. EspĂ©cies com ampla ocorrĂŞncia no Brasil foi o padrĂŁo de distribuição geográfico mais expressivo, agrupando 45 espĂ©cies, que correspondeu a mais da metade da flora analisada (54%). As demais espĂ©cies apresentam um padrĂŁo disjunto-nordeste (27%) e restrito Ă AmazĂ´nia (18%), respectivamente 23 e 15 espĂ©cies.Palavras-chave: AmazĂ´nia, dispersĂŁo, fitogeografia, restinga.This study aimed to characterize the dispersal syndromes of woody vegetation in a forest sandbanks Amazon (APA Algodoal-Maiandeua, Pará) phytogeographical relationships and establish about the origin of this flora from species sharing with other sandbanks off the Brazilian coast and the Amazon rainforest. The species were classified according to the strata they occupy in the forest, considered in this study: understory (below 5 m) and upper stratum (greater than 5 m). 84 species were recorded in 35 botanical families, with diversity (H') of 3.78nat ind-1. The primary dispersion syndrome zoochory corresponds to 89% of species (74) followed by autocory, 6% (5) 5% anemochory (4). The analysis of species sharing with other sandbanks along the Brazilian coast points to a pattern of geographical proximity, with greater similarity to the sandbanks Northeast (37%), Southeast (20%) and South (19%). Regarding the Amazon forest, more than half (60%) of the species were common to the types of vegetation. Species with wide occurrence in Brazil were the most significant geographical pattern of distribution, gathering 45 species, which is over half the flora analyzed (54%). Others species show a pattern disjoint-northeast (27%) and restricted to the Amazon (18%), respectively 23 and 15species.Keywords: Amazonian, dispersion, phytogeography, coastal sandbank