Banca de QUALIFICAÇÃO: MATHEUS BENTO MEDEIROS
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.STUDENT : MATHEUS BENTO MEDEIROS
DATE: 20/07/2024
TIME: 14:00
LOCAL: Google Meet
TITLE:
KEY WORDS:
Convergence; Ferns; Long-Distance Dispersal; Speciation; Vicariance.
PAGES: 65
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:
Several groups of vascular plants exhibit morphologically similar species living on both sides of the tropical Atlantic, which has been attributed to vicariance and dispersal processes. A previous study by Moran & Smith documented this pattern of floristic relationships for ferns and lycophytes, highlighting Polypodiaceae as one of the families with the highest occurrence of these relationships of morphological similarity. However, the phylogenetic relationship between these species pairs and the biogeographical processes involved have not been fully understood yet. Therefore, the aim of this study was to determine the evolutionary history and biogeographical relationships involved in the existence of Polypodiaceae species pairs between the Neotropics and the Afrotropics. To achieve this goal, the floristic relationships proposed by Moran & Smith for the Polypodiaceae family were used. A maximum credibility topology was constructed, using 110 species distributed in 18 genera and dated through secondary calibration. Moreover, more than 50,000 occurrence records were obtained from GBIF to define bioregions to be included in subsequent analyses. A presence-absence matrix of each species per bioregion was created. Based on this data, biogeographical inferences were made using the BioGeoBEARS package in the R software. Three models (DEC, DIVA, BayArea) were tested, each with the addition of a founder-effect test. The six models were compared using the Akaike Information Criterion (AIC) to select the model that best explained the data. Stochastic Biogeographic Mapping (BSM) was also conducted to estimate the number and mode of biogeographic events. Out of the 15 floristic relationships proposed by Moran & Smith, seven relationships were retrieved as closely related and corroborated by previous topologies. The species pair Microgramma lycopodioides and M. mauritiana was the only one explained by evolutionary convergence. The most frequent events were sympatric speciation, followed by dispersal, with South America as the major source of dispersal events. The morphological similarity between disjuncted Polypodiaceae species is possibly explained by occasional long-distance dispersal events between continents during their geological history. These results contribute to the understanding of fern biodiversity and evolution, providing valuable insights into floristic relationships between the Neotropics and the Afrotropic region.
COMMITTEE MEMBERS:
Interno - 1782412 - ALFREDO PEDROSO DOS SANTOS JUNIOR
Externo à Instituição - LUCAS VIEIRA LIMA
Presidente - 2143049 - THAIS ELIAS ALMEIDA
Externo à Instituição - THIAGO JOSE DE CARVALHO ANDRE