First Record of Fungi and Actinobacteria Isolated from the Marine Sediment Collected in the Intertidal Region from an Island Located in the South of Brazil

Mel Island is considered a Natural Historic Site of Paraná State, South Brazil, with approximately 2,760 ha, of which about 95% are protected as the Ecological Station and State Park. This is the first record that evaluates the presence of actinobacteria and fungi in this environment. This research studied the spatial variability of fungi and actinobacteria in the surface of fifteen intertidal stations in Mel Island, Brazil. The number of organisms was compared in relation to physical-chemical factors. We isolated 332 microorganisms. The results showed significance in the temperature of the sediments related to the time of the day on which sample was collected. There were significant differences in the amount of cultivated fungi and actinobacteria. The Principal Component Analysis (PCA) showed that there was an inverse correlation between the number of microorganisms and the temperature. The grain size and organic matter sediment did not interfere in the amount of fungi and actinobacteria. The results show the expansion of the knowledge about the microbiology in the regions between tides furthermore, this microorganisms collected from marine sediment can hold great promise as biological control agents and they might show ability to produce undescribed bioactive compounds yet.