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Diversification patterns in the tribe Sauvagesieae (Ochnaceae), a species-rich group in the highly diverse non-Andean montane floras of South America

Grant number: 20/09442-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): February 01, 2021
Effective date (End): April 30, 2023
Field of knowledge:Biological Sciences - Botany
Principal Investigator:José Rubens Pirani
Grantee:Sandra Patricia Reinales Ladino
Home Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The tribe Sauvagesieae (Ochnaceae) is a predominantly-Neotropical clade comprising ca. 90 species and 16 genera. The greatest number of species in this region are found along the Brazilian Espinhaço Range, the Amazon-Guyana region, and some species in the northernmost Andean mountains, areas considered biodiversity hotspots with high endemism. Although several studies have been developed concerning the floristic composition and phytogeographical patterns of these areas, the understanding of the correlation between morphological evolution and geological-environmental changes with diversification dynamics across lineages, is still incipient. Currently, phylogenomic approaches allow to have more completely-sampled phylogenies, to assess the macroevolutionary patterns of the Neotropical flora in a phylogenetic context. Hence, the species richness and endemism rates of the tribe Sauvagesieae on highland regions of South America, make the tribe a good model for testing hypotheses of the recent radiation of mountain floras and the biotic or abiotic factors that explain the unbalanced species richness among lineages, and across geographical distribution. The main goals of this study are to reconstruct the phylogenetic relationships of the tribe Sauvagesieae using a phylogenomic approach, in order to characterize the diversification dynamics across lineages, and to test hypotheses about the correlation between the evolution of some morphological and environmental traits such as growth habit and types of seeds, with the diversification dynamics in this group. (AU)