Composition and structure of the bryophyte community of Park Savanna in Marajó Island, Pará, Brazil.

Aiming to enrich the knowledge about the flora of savannas, this paper studied the composition and structure of the bryophyte community of Park Savanna areas in Marajó Island - PA. Biological material was collected within 60 100-m2 plots equally distributed in the dry season of 2016 and the rainy season of 2017 in five Park Savanna areas (SP-I to SP-V). The composition, density, richness and diversity of species and presence of indicator species were compared between the sampled areas and seasons. The species were classified according to the substrates colonized and ecological groups of light tolerance. Significant differences in SP-V indicated that the area was the main factor influencing the composition of bryophytes (p: 0.0001), with five indicator species. There were also significant differences in density (p = 0.0001168) and richness (p = 0.0001317) of bryophytes between seasons (p-value = 0.3393; p-value = 0.04065; p: 0.1081). There was a predominance of generalist (25 spp.) and corticolous (728 individuals) species, which were widely distributed in the sampled areas. Therefore, the structure of the bryophyte communities was not influenced by seasonality, and this indicates that these plants are adapted to the environmental conditions.

Helicophyllaceae (Bryophyta), nova ocorrência para o Estado do Pará, Brasil / Helicophyllaceae (Bryophyta), a new record to Pará State, Brazil

Helicophyllaceae, família monotípica neotropical, é registrada pela primeira vez no Estado do Pará. Sua única espécie, Helicophyllum torquatum (Hook.) Brid., registrada anteriormente no Estado do Amazonas e que recentemente havia sido excluída da lista de musgos amazônicos, é apresentada como nova ocorrência para toda a Amazônia brasileira.

Musgos (Bryophita) do nordeste Paranaense, Brasil -1. Zona Bragantina, microrregião do Salgado e município de Viseu / Mosses (Bryophyta) of northeast Pará, Brazil -1. Zona Bragantina Salgado microregion and Viseu municipality

Neste trabalho foram inventariadas as espécies de musgos que ocorrem nos diferentes tipos de vegetação dos municípios da Zona Bragantina, da Microrregião do Salgado e município de Viseu, todos localizados no Nordeste Paraense. Coletaram-se 632 amostras, que resultaram em 60 espécies e uma variedade, distribuídas em 30 gêneros e 16 famílias. Sematophyllaceae, Calymperaceae e Leucobryaceae destacaram-se em diversidade de espécies e número de ocorrências. Sematophyllum subsimplex (Hedw.) Mitt. e Calymperes lonchophyllum Schwaegr. são as espécies mais abundantes. Os resultados referentes à Microrregião do Salgado são comparados aos encontrados na Zona Bragantina e município de Viseu. Ocorre maior diversidade nas matas primárias, indicando que a substituição delas por vegetação secundária resulta no empobrecimento da diversidade das espécies de musgos.

This paper is an inventory of moss species occuring in diferent types of vegetation in the Zona Bragantina, Salgado microregion and Viseu municipalities, all located in the northeast of Pará. The results found 60 species and one variety in 632 moss samples, distributed in 30 genera and 16 families. Sematophyllaceae, Calymperaceae e Leucobryaceae were prominent in diversity of species and number of occurrencies. Sematophyllum subsimplex (Hedw.) Mitt. and Calymperes lonchophyllum Schwaegr. are the most abundant species. The results found at Salgado Microregion were compared to the results found at Zona Bragantina and Viseu municipalities. There is a higher diversity in primary vegetation, indicating that the replacement by the secondary vegetation results in the impoverishment of moss species diversity.