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Characterization of the natural vegetation in Ribeirão Preto, SP: Bases for conservation

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Author(s):
Henriques, Olga Kotchetkoff
Total Authors: 1
Document type: Doctoral Thesis
Press: Ribeirão Preto. [2003]. 208 f., ilustrações.
Institution: Universidade de São Paulo (USP). Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto
Defense date:
Examining board members:
Joly, Carlos Alfredo; Bernacci, Luis Carlos; Metzger, Jean Paul Walter; Oliveira, Alexandre Adalardo de; Rodrigues, Ricardo Ribeiro
Advisor: Joly, Carlos Alfredo
Field of knowledge: Biological Sciences - Ecology
Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP
Location: Universidade de São Paulo. Biblioteca Central do Campus de Ribeirão Preto; FFCLRP/Henriques, Olga Kotchetkoff
Abstract

In a search to establish a solid base for conservation of forest fragments in Ribeirão Preto, SP, a diagnosis of the natural vegetation of the municipality was done. There are 102 forest remnants and in 99 of them an expeditious floristic survey was carried out. In this survey, 494 tree species were found belonging to 74 botanic families along with 31 exotic species. Based on the species composition of each fragment, a Detrended Correspondence Analysis (DCA) was conducted using the soil class where the fragment is found as categorical variable. This analysis indicates the existence of four vegetation groups: mesophytic forests, deciduous forests, swampy forests and cerrado, that occur respectively in purple latosol, lithosol, hydromorphic soil and dark red latossol or yellow red latossol. Each group presents its own floristic composition and typical vegetation physiognomy. The richness of species found in each fragment was from 13 to 134 species. There is a very large number of species that are very difficult to find - 275 species (52,38%) that occur in less than 5% of the fragments and 9 species (1,71%) occur in more than 50% of the remnants. There are species with rare occurrences in all fragments, but they tend to occur in larger number in the bigger ones. Each fragment presents a small percentage of the total of species, which indicates that to preserve the species diversity all the fragments are important. Generally, the initial secondary and animal dispersed species predominate in the fragments with the tendency to increase the proportion of the pioneer and wind dispersed species with the increase of the human disturbance. The majority of the fragments are small and isolated... (AU)

FAPESP's process: 99/11347-2 - Characterization of the remnants of vegetation in Ribeirão Preto, SP
Grantee:Olga Kotchetkoff Henriques
Support type: Scholarships in Brazil - Doctorate