12 research outputs found
Study of the Cu, Mn, Pb and Zn dynamics in soil, plants and bee pollen from the region of Teresina (PI), Brazil
The conservation of native priority medicinal plants in a Caatinga area in Ceará, northeastern Brazil
Spatial variation in the structure and composition of the herbaceous community in a semiarid region of northeastern Brazil
Patterns of species richness and abundance among cactus communities receiving different rainfall levels in the semiarid region of Brazil
Riparian Vegetation Structure in a Conservation Unit in the Semi-Arid Region of Paraíba, Brazil
Do the seasonal forests in northeastern Brazil represent a single floristic unit?
Floristic analyses (Principal Component Analysis and Analysis of Group Indicators) at the genus level were employed to characterize and compare seasonal forest formations in northeastern Brazil. The presence - absence of 248 genera of woody plants occurring in 24 floristic surveys was correlated with geomorphology and climatic variables. The analyses were consistent and point to the existence of two floristic groups of seasonal forests in the region, one more closely related to the Atlantic Coastal Forest (mata atlântica) and the other to the xerophytic formations (caatinga) of the region. The driest seasonal forest group experiences more than 8 dry months per year and/or a total annual rainfall of <1000 mm, and is found on the ancient eroded peaks in the semi-arid core and on the western slopes of the Borborema Plateau