Revisiting phylogeny, systematics, and biogeography of a Pleistocene radiation

Autor(es)

Romeiro-Brito, Monique ; Khan, Gulzar ; Perez, Manolo F. ; Zappi, Daniela C. ; Taylor, Nigel P. ; Olsthoorn, Gerardus ; Franco, Fernando F. ; Moraes, Evandro M.

• Tipo de documento: Artigo Científico
• Fonte: AMERICAN JOURNAL OF BOTANY; v. 110, n. 3, p. 17-pg., 2023-03-07.

Resumo

PremisePilosocereus (Cactaceae) is an important dry forest element in all subregions and transitional zones of the neotropics, with the highest diversity in eastern Brazil. The genus is subdivided into informal taxonomic groups; however, most of these are not supported by recent molecular phylogenetic inferences. This lack of confidence is probably due to the use of an insufficient number of loci and the complexity of cactus diversification. Here, we explored the species relationships in Pilosocereus in more detail, integrating multilocus phylogenetic approaches with the assessment of the ancestral range and the effect of geography on diversification shifts. MethodsWe used 28 nuclear, plastid, and mitochondrial loci from 54 plant samples of 31 Pilosocereus species for phylogenetic analyses. We used concatenated and coalescent phylogenetic trees and Bayesian models to estimate the most likely ancestral range and diversification shifts. ResultsAll Pilosocereus species were clustered in the same branch, except P. bohlei. The phylogenetic relationships were more associated with the geographic distribution than taxonomic affinities among taxa. The genus began diversifying during the Plio-Pleistocene transition in the Caatinga domain and experienced an increased diversification rate during the Calabrian age. ConclusionsWe recovered a well-supported multispecies coalescent phylogeny. Our results refine the pattern of rapid diversification of Pilosocereus species across neotropical drylands during the Pleistocene and highlight the need for taxonomic rearrangements in the genus. We recovered a pulse of diversification during the Pleistocene that was likely driven by multiple dispersal and vicariance events within and among the Caatinga, Cerrado, and Atlantic Forest domains. (AU)

• Processo FAPESP: 15/06160-5 - Filogenia de Pilosocereus (Cactaceae) e delimitação de espécies no grupo Pilosocereus aurisetus baseado em modelos de coalescência e dados multiloco
• Beneficiário: Evandro Marsola de Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/25227-0 - Análises Filogenéticas Multilocos aplicadas ao entendimento de relações evolutivas entre espécies de Cereus (Cactaceae; Cereeae)
• Beneficiário: Fernando de Faria Franco
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/22943-1 - Filogeografia multilocos do grupo PILOSOCEREUS AURISETUS (Cactaceae)
• Beneficiário: Manolo Fernandez Perez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/22477-0 - Filogeografia de nova geração do grupo de cactáceas Pilosocereus aurisetus: teste de hipóteses e desenvolvimento de marcadores nucleares
• Beneficiário: Evandro Marsola de Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Regular