Abstract
Environmental Protection Area Guariroba is an area to protect the headwaters of a creek formed by streams of Veredas, generating the main water supply of municipality of Campo Grande, state of Mato Grosso do Sul, Brazil. Some degraded areas have to be restored; thus, it is important to investigate species composition and variations of the vegetation. Our objective was to evaluate the seasonal variation of the vegetation structure of Veredas within the hydrographic sub-basin. We estimated species cover in five points, each one with 0.5 x 0.5 m plots along 50 m transects on the five stream banks in two seasonal periods. We found 134 species from 95 genera and 49 families. In both seasons, Poaceae, Cyperaceae and Asteraceae were the richest families and the richest genera were Eleocharis (N = 6), Rhynchospora and Utricularia (N = 4). Species richness varied between Veredas, from 31 to 70. We found 41 species exclusive to the rainy season and 38 to the dry season. The analyses identified seven indicator species for the dry season and ten for the rainy season. There are seasonal differences in floristic composition and vegetation cover. Thus, the dynamics of water availability in Veredas, which is related to seasonality, is necessary for the maintenance and functioning of these habitats, which have an important role in local flora, fauna and water availability for the municipality.
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