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Phylogeny and biogeography of Tynanthus Miers (Bignonieae, Bignoniaceae)

Texto completo
de Medeiros, Maria Claudia M. P. [1] ; Lohmann, Lucia G. [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05508090 Sao Paulo, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Molecular Phylogenetics and Evolution; v. 85, p. 32-40, APR 2015.
Citações Web of Science: 4

The origin of Neotropical biodiversity represents a key question in evolutionary biology. Despite the attempts to decipher the role of ecological and historical factors to present-day distribution patterns, robust phylogenetic studies of Neotropical clades are still needed before a comprehensive picture of the origin of Neotropical biodiversity can be achieved. Tynanthus Miers (Bignonieae, Bignoniaceae) is a well-circumscribed genus of Neotropical lianas with species that are narrowly distributed, except from a few taxa. The genus is characterized by a clove odor, small bilabiate flowers with the two upper lobes almost fused, and fruits with raised margins, all of which represent morphological synapomorphies for this clade. Other distinctive characters are the thecae reflexed forward, the densely pubescent ovaries and the poorly-developed nectariferous disk. The circumscription of the genus has remained constant over the years, despite the problematic limits of most genera of tribe Bignonieae. In this study, we reconstruct the phylogeny of Tynanthus based on two plastid (ndhF and rpl32-trnL) and one nuclear (pepC) markers and use this phylogenetic framework to investigate the biogeographical history of the genus. Our phylogenetic hypothesis provides further support for the monophyly of Tynanthus, and strongly supports a series of infra-generic clades. Most species are reconstructed as monophyletic, while T. cognatus and T. polyanthus are paraphyletic. Biogeographic reconstructions suggest that Tynanthus originated between 9.4 and 21.5 Mya, most likely at approximately 15.3 Mya. The MRCA of the genus was likely broadly distributed through lowland Amazonia, Western South America and Central America and diversified in the Neotropics during the Miocene. Closely related species are generally distributed within the same biogeographic area, suggesting that niche conservatism has played an important role in the diversification history of the group. (C) 2015 Elsevier Inc. All rights reserved. (AU)

Processo FAPESP: 12/50260-6 - Estruturação e evolução da biota amazônica e seu ambiente: uma abordagem integrativa
Beneficiário:Lúcia Garcez Lohmann
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático
Processo FAPESP: 11/50859-2 - Sistemática da tribo Bignonieae (Bignoniaceae)
Beneficiário:Lúcia Garcez Lohmann
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/51579-0 - Revisão taxonômica, filogenia e evolução do nicho ecológico de Tynanthus Miers (Bignonieae, Bignoniaceae)
Beneficiário:Maria Cláudia Melo Pacheco de Medeiros
Linha de fomento: Bolsas no Brasil - Doutorado