Diversidade florística de ilhas em vegetação de um inselberg no Sertão Paraibano, Nordeste do Brasil.

Abstract

Islands of vegetation were studied in a Inselberg in the town of Patos , Paraiba backwoods mesoregion called saw Peter Augustine ( 7 ° 4 ' 14.0 " S and 37 ° 13' 57.7 " W ) . The islands of vegetation were assumed for this work as vegetable grouping of one or more species of vascular plants delimited by a surface of rock. The aim of this study was to catalog the floristic and structural diversity of islands of vegetation and verify the relationship area and species richness of the vegetation islands. The study sample included 12 parcels and 168 vegetation islands of different sizes along a strand of Inselberg . 22 vascular plant species, distributed in 12 families were recorded. The floristic diversity presented Fabaceae richest family Apocynaceae and five species, Bromeliaceae Burseraceae , Cactaceae , Euphorbiacea , Malvaceae , Molluginaceae, Poacea , Rubiaceae , Cyperaceae Velloziaceae and with one or two species each . The possible relationship between area and species richness of vegetation islands was tested using the Spearman correlation with the PAST software tools, this analysis showed that larger islands have more species. In the islands of vegetation, distinct assemblages found in different altitudinal zones. The study found that outcrops act as a refuge of endemic, pioneering and enabling plants, besides hosting animal species.