Banca de QUALIFICAÇÃO: TAYNÁ BARBOZA FERRARI

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : TAYNÁ BARBOZA FERRARI
DATA : 14/02/2020
HORA: 08:30
LOCAL: Departamento de Zoologia, Universidade de BRasília
TÍTULO:

Determinants of the genetic diversity of lizards in the Brazilian Cerrado

PALAVRAS-CHAVES:

bGMYC, biogeography, machine learning, population genetics.

PÁGINAS: 40
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia Teórica
RESUMO:

Diversity, at the molecular level, can be investigated through the average number of nucleotide differences observed among individuals in a population, and the determining factors of these differences in Neotropical lizards are still poorly understood. In this work, we tested the influence of historical, ecological and environmental predictors determining the genetic diversity of lizard populations in the Brazilian Cerrado. We investigated different patterns of populations located at the center vs. periphery, plateau regions vs. depressions, and areas defined as historically stable vs. unstable for the biome. We hypothesized that central populations, those located at plateaus and in historically stable areas would have higher genetic diversity. The data consisted of previously published mitochondrial DNA sequences from 34 lizards species collected throughout the Brazilian Cerrado. After alignment, populations were defined using the bGMYC algorithm and their localities. For each population, nucleotide diversity was calculated. The snout-vent length, altitude, number of lineages per species, historical stability and distances to the center and margins of the Cerrado were used as predictors of genetic diversity in a machine learning multivariate analysis. The preliminary analyses indicate that populations farther from the Cerrado limits, with smaller body sizes and few lineages exhibit higher genetic diversity. In addition, populations at intermediate altitudes showed lower genetic diversity compared to populations of high and low altitudes. Finally, the distance of the populations to the center of the biome do not explain the genetic diversity values. Being so, the evolutionary patterns related to the environmental characteristics and ecological differences of the species provide a better understanding of the processes that shaped the genetic diversity of the region.

MEMBROS DA BANCA:
Presidente - 005.506.021-86 - FABRÍCIUS MAIA CHAVES BICALHO DOMINGOS - NENHUMA
Interno - 132029001 - EDDIE LENZA DE OLIVEIRA
Externo à Instituição - ROSANE GARCIA COLLEVATTI - UFG
Externo à Instituição - RICARDO RODRIGUES DA SILVEIRA FILHO - UFRN