Abstract
Floristic surveys are the basis of phytodiversity knowledge and when carried out in protected areas add value because they can generate incentives for conservation and subsidies for management plans. With the objective to contribute to flora knowledge in Piaui State, Brazil, a floristic study was developed in the riparian forest Uruçuí-Una Ecological Station. This station has a 135.122,29 ha area and is in Baixa Grande do Ribeiro municipality, Piauí, in Northeast of Brazil. The area is in Cerrado’s phytogeographical domain, with riparian forest along the river Uruçuí-Preto, which borders part of its area. The survey was conducted from samples collected of woody vascular plants in an area of approximately 4.5 ha on the left bank of Uruçuí-Preto River. The samples collected were properly herborized, taxonomically identified, and stored in herbaria Graziela Barroso (TEPB) and Delta do Parnaíba (HDELTA). The study resulted in 90 species, 71 genus, and 37 families. Except for Tilesia baccata species, Asteraceae naturalized, all species are native to Brazil, and 21.50% are also endemic in Brazil and 6.45% endemic in Cerrado. Most species, i.e 78.49% were not evaluated for the extinction risk, while 15.05% are classified in the Little Worrying category and only, Bowdichia virgilioides is in the condition of Near Threatened. This study contributes significantly to the scientific literature as it is the second floristic survey presented for this conservation unit since 1984, and the first study carried out in the riparian forest in this protected area of the Brazilian Cerrado.
Highlights
The Cerrado is considered to be a biodiversity richest savannah in the world and a global critical point on conservation priorities (Franke, et al, 2018) and is the second major phytogeographical domain Brazil, occupying an area of about two million square kilometers which corresponds to 25% of the national territory and has strong dynamics that varies with seasonal and anthropism, the latter mainly due to the production of grain (Resende & Guimarães, 2007; Sano, et al, 2007; Dias, 2008)
In Piauí and Maranhão the Cerrado sensu lato is presented in the form of the following phytophysiognomies: dirty field cerrado, field cerrado, cerrado sensu stricto and cerradão (Castro & Martins, 1999)
The cerrado sensu stricto can be divided into four subtypes depending on the density of the tree-shrub component and local environmental conditions: dense cerrado, typical cerrado locally called cerrado típico, thin cerrado, and rocky outcrop cerrado locally called “cerrado rupestre” (Ribeiro & Walter, 2008)
Summary
The Cerrado is considered to be a biodiversity richest savannah in the world and a global critical point on conservation priorities (Franke, et al, 2018) and is the second major phytogeographical domain Brazil, occupying an area of about two million square kilometers which corresponds to 25% of the national territory and has strong dynamics that varies with seasonal and anthropism, the latter mainly due to the production of grain (Resende & Guimarães, 2007; Sano, et al, 2007; Dias, 2008).In addition, it is one of the Brazilian domains most anthropized by human activity (Beuchle, et al, 2015). The Cerrado is considered to be a biodiversity richest savannah in the world and a global critical point on conservation priorities (Franke, et al, 2018) and is the second major phytogeographical domain Brazil, occupying an area of about two million square kilometers which corresponds to 25% of the national territory and has strong dynamics that varies with seasonal and anthropism, the latter mainly due to the production of grain (Resende & Guimarães, 2007; Sano, et al, 2007; Dias, 2008). The cerrado sensu stricto can be divided into four subtypes depending on the density of the tree-shrub component and local environmental conditions: dense cerrado, typical cerrado locally called cerrado típico, thin cerrado, and rocky outcrop cerrado locally called “cerrado rupestre” (Ribeiro & Walter, 2008)
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