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Abstract Detail

Systematics Section/ASPT

Michelangeli, Fabian [1], Reginato, Marcelo [2], Caddah, Mayara K. [3], Goldenberg, Renato [4].

Biogeographical patterns of the Melastomataceae of the Atlantic Forest.

The family Melastomataceae has ca. 3500 species in the Neotropics (ca. 70% of its entire diversity). Of these, ca. 580 are present in the Atlantic Forest along eastern Brazil, with over 470 of them endemic to this biogeographic hotspot. This makes the Melastomataceae an ideal model group to study biogeographic patterns between the Atlantic Forest and other areas of the Neotropics, especially the Amazonia, the Andes, and Cerrado, and also to study patterns within the Atlantic Forest (AF). The AF species are not evenly distributed throughout the family, with most of them concentrated in nine clades in which the vast majority (or all) the species are endemic. Three clades are derived within the tribe Miconieae (Leandra s.str. [ca. 200 spp.], Miconia discolor clade [31 spp] and Miconia section Chaenanthera [ca. 25 spp.]), one within Meriania [14 spp.], two within the genus Tibouchina in the tribe Melastomeae (Tibouchina clinopodifolia clade [ca. 25 spp] and section Pleroma [ca. 75 spp]) the entire Physeterostemon-Eriocnema clade (7 spp), the genus Bertolonia (ca. 25 spp) and a clade composed of Merianthera, Huberia, Behuria and Dolichoura (25 spp.). Biogeographic analyses show that the Amazon is the source area for the three Miconieae clades and Tibouchina section Pleroma. The Guiana shield and/or the Amazon are reconstructed as the origin of the endemic Meriania clade, the Andes are reconstructed as the origin of the Tibouchina clinopodifolia clade and the Cerrado as the origin of the Merianthera and allies clade. Reconstructions are ambiguous for the Bertolonia and Phyterostemon clades. Small groups of species have repeatedly enter the Cerrado from Atlantic Forest in most clades, small groups of Andean species are derived from within the AF, and local radiations are also observed inside the AF. Using biogeographical models we investigate common patterns across the nine clades at a neotropical level scheme, while patterns inside the AF are focused on four clades densely sampled (the three Miconieae clades and Merianthera). An overview of climatic niche evolution is also presented and we discuss the establishment of the dry diagonal in South America as a factor in maintaining high levels of endemicity, as well putative pulsated patterns of incursions across biogeographical areas between and within the AF.

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1 - The New York Botanical Garden, Institute Of Systematic Botany, 2900 Southern Blvd., Bronx, NY, 10458, USA
2 - The New York Botanical Garden, 2900 Southern Blvd, Bronx, NY, 10458-5126, United States
3 - Universidade Federal de Santa Catarina, Florianopolis, SC, Brazil
4 - Universidade Federal do Parana, Curitiba, PR, Brazil

Atlantic Forest

Presentation Type: Oral Paper:Papers for Sections
Session: 19
Location: Salon 9/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 2:45 PM
Number: 19006
Abstract ID:1016
Candidate for Awards:None

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