masterThesis
Riqueza de fungos micorrízicos arbusculares em remanescente de Mata Atlântica de tabuleiro costeiro do Rio Grande do Norte
Fecha
2016-08-17Registro en:
VISTA, Xochitl Margarito. Riqueza de fungos micorrízicos arbusculares em remanescente de Mata Atlântica de tabuleiro costeiro do Rio Grande do Norte. 2016. 86f. Dissertação (Mestrado em Ciências Biológicas) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2016.
Autor
Vista, Xochitl Margarito
Resumen
The Coastal tablelands constitute a geoenvironmental unit distributed throughout the Brazilian
coast, whose main vegetation is the Atlantic Forest. Arbuscular Mycorrhizal Fungi (AMF) are
obligatory symbionts of plants, which represent an important component of the soil
microbiota in natural and agricultural ecosystems. Study of diversity in coastal environments
are relevant, presenting biotic and abiotic peculiarities. In addition, inventories of AMF in
coastal systems conducted in Brazil are limited. Protected areas are needed to ensure the
conservation of habitats where the AMF occur naturally and have evolved, representing an
appropriate place for in situ conservation. The objective of this study was to evaluate the
diversity of a coastal tablelands complex of the Atlantic Forest domain of Rio Grande do
Norte, in order to increase knowledge about the composition and distribution of this group of
organisms. For this, nine soil samples were studied for taxonomic identification, three
samples of the rainy period and six of dry. We found 47 species of AMF (30 in the rainy
season and 26 in the dry season), distributed in nine families: Acaulosporaceae (9 spp),
Ambisporaceae (3 spp.), Dentiscutataceae (4 spp.), Diversisporaceae (4 spp.),
Entrophosporaceae (4 spp.), Gigasporaceae (3 spp.), Glomeraceae (14 spp.), Racocetraceae (2
sp.), Scutellosporaceae (3 spp.) and 17 genera. Of the 138 species, recorded in the Atlantic
Forest biome, 35% correspond to the AMF in coastal tablelands of Atlantic Forest remnants
studied. This represents 16% of species known for Phyllum. For Brazil it represents 30% of
the species. For the Northeast, it represents 38%. For the RN there were only 41 registered
species, however this number was increased to 55 with the data obtained in this present study.
In addition, the area presents 37% of the species reported in globally protected areas.
However, species composition changed between the periods, with the highest number of
species in the rainy season. In addition, species richness was more representative in the rainy
period than in the dry season, even though the sample strength was lower in the rainy season.
The genera Acaulospora and Glomus were the most representative, in addition, the
registration of Glomus spinuliferum Sieverd & Oehl, was increased for Brazil and for the
Atlantic Forest biome. The results obtained demonstrate the diversity potential of AMF
present in coastal tablelands areas in remnants of Atlantic Forest.