Floristic and phytosociology of the tree-shrub component of riparian forest in early successional stage in the Xaxim river microbasin (Western Paraná, Brazil): subsidies for ecological restoration.
The existing megabiodiversity in Brazil is represented a variety of biomes, such as the Atlantic Forest, which is considered one of the most biodiverse biomes in the world. However, this biodiversity has been threatened by human activities, resulting in habitat fragmentation and environmental degradation. Techniques recommended by ecological restoration science have been applied to reverse environmental deg-radation and promote the restoration of vegetation. Qualitative and quantitative information on the vegetation of areas in the process of secondary succession consti-tutes important subsidies for the application of active restoration techniques based on the planting of seedlings. This work presents a floristic and phytosociological study of the tree-shrub component of 12-year-old riparian vegetation that spontane-ously regenerated in an area of abandoned pasture (passive restoration). Information regarding species abundance, dispersal syndrome (zoochory, anemochory and auto-chory), successional category (pioneer and non-pioneer) and extinction threaten was compiled. A total of 856 individuals were sampled, where 60 native species and four exotic ones were identified, distributed in 31 families. The most abundant families were Myrtaceae, Euphorbiaceae and Fabaceae, with 431, 175 and 60 individuals, respectively. The richest families were Myrtaceae and Fabaceae with 11 and seven species, respectively. The most abundant and frequent species were Myrcia selloi, Gymnanthes klotzschiana, Myrcia subcordata, Sebastiania brasiliensis, Myrcia glomerata and Eugenia involucrata. The zoochoric dispersal syndrome was the most common with 38 species and 547 individuals. The non-pioneer successional category pre-dominated with 33 species and 533 individuals. No endangered species were found in the area. The information available in this study may support projects for the active restoration of riparian forests in the region.