Banca de DEFESA: ANA PAULA ALVES DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANA PAULA ALVES DA SILVA
DATE: 31/08/2022
TIME: 08:00
LOCAL: https://meet.google.com/yui-efxz-whd
TITLE:

PHYLOGENETIC SYSTEMATIC AND BIOGEOGRAPHY OF RHIPSALIDEAE DC. (CACTACEAE JUSS.)

KEY WORDS:

Bioregionalization, Evolutionary Biogeography, Distribution Patterns, Phylogenetic Reconstruction, Time of Divergence

PAGES: 200
BIG AREA: Ciências Biológicas
AREA: Botânica
SUBÁREA: Botânica Aplicada
SUMMARY:

Rhipsalideae includes the majority of epiphytic cacti, distributed mostly in South America. Currently, it comprises 62 species distributed in five genera, with a center of diversity in eastern Brazil, inhabiting mainly the Brazilian Atlantic Forest. However, the generic and subgeneric delimitations of the group and the knowledge of divergence times and about the diversification of the tribe is still incipient. Thus, this work aimed to present a consensual hypothesis for the phylogeny of Rhipsalideae and to investigate the biogeographic history and evolutionary aspects of the tribe. In the first chapter, biodiversity patterns were investigated and a bioregionalization scheme was proposed for Cactaceae in the Neotropical region based on occurrence data from public databases to produce a comparative framework for subsequent biogeographic analyses carried out in the other chapters. We concluded that the three main centers of diversity of the family are in Mexico, in the Andean region and in Eastern Brazil. Our analyses produced an original bioregionalization scheme for cacti, which was used as a backbone for exploring aspects of patterns and processes underlying the biogeographic history and diversification of Rhipsalideae (chapter 3). In the second chapter, the dated phylogeny of Rhipsalideae was reconstructed using DNA sequence data available in Genbank. The tribe was confirmed as monophyletic and two main clades were recovered, the first including Rhipsalis and the second including Hatiora, Lepismium, Rhipsalidopsis and Schlumbergera. The origin of the tribe dates back to the Miocene, as well as for the genera Schlumbergera, Hatiora and Lepismium. Rhipsalis dates from the Pliocene and the extant species diversified more recently, during the Pleistocene. Finally, patterns of distribution, richness and endemism of Rhipsalideae were identified and the evolutionary biogeography of the tribe was investigated in chapter 3. Three patterns of geographic distribution were outlined: intercontinental disjunct, restricted to the humid forests of southern Central America and northern South America and restricted to South America. The areas with the greatest richness, phylogenetic diversity and endemism of the tribe are in the Atlantic Forest, in eastern Brazil, where the tribe originated.

COMMITTEE MEMBERS:
Presidente - 1813882 - ALICE DE MORAES CALVENTE VERSIEUX
Interno - 1755074 - LEONARDO DE MELO VERSIEUX
Externo ao Programa - 3232315 - GABRIEL DAMASCO DO VALE - UFRNExterno à Instituição - DIEGO RAFAEL GONZAGA
Externa à Instituição - LUIZA FONSECA AMORIM E PAULA