Inventário da diversidade de musgos (BRYOPHYTA) do município de Barcarena (PA), Brasil.

Abstract

It was made an inventory about the mosses diversity at Barcarena municipality in order to increase the knowledge about the bryoflora in the State of Pará. Since the 80's the municipal ity has had its natural forests almost entirely replaced due to the unplanned occupation in the area, with the settling of the industrial complex ALBRAS-ALUNORTE for aluminium production. The municipality physiognomy has as its characteristics várzea forests in areas under floods influence, also beach areas by the rivers, igapós, campinas, terra firme forests fragments and the secondary forests (capoeiras) in great extensions. The material of study has its origin in two sources: samples deposited at the Museu Paraense Emílio Goeldi Herbarium collected in 1984 and 1985 in várzeas ecosystems, and samples collected in 2001 and 2002 during excursions in diverse ecosystems in Barcarena city and Trambioca island The results are presented in two articles. The fírst refers to the floristic and taxonomic aspects from the species at Barcarena, the seat of the municipality. The second article is about the mosses diversity at Trambioca Island, which is characterized by several ecosystems not signifícantly disturbed, as a fragment of dense forest on terra firme. 51 species distributed in 26 genera and 16 families were identifíed. Calymperaceae, Sematophyllaceae, Fissidentaceae, Elypnaceae, Leucobryaceae e Pilotrichaceae were the most representatives families. The occurrence of species Hyophila involuta (Hook.) A. Jaeger, Hyophiladelphus agrarius (Eledw.) R. H Zander, Meioíhecium boryanum (Müll. Hal.) Mitt,, Sematophyllum suhpimiatum (Brid.) E. Britton e Calymperespalisotii Schwàgr., considered as characteristic of disturbed areas, point the interference of antropic action changing the municipality original mosses ecosystems. The specie Philonoíis gracil/ima Ângstr. e Isopterygium acutifoUum Ireland are new records for State of Pará. The replacement of the native forests for secondary vegetation as the result of the increasing population in the region has influenced the mosses diversity at the municipality.