Banca de DEFESA: GABRIELA SCHMAEDECKE

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : GABRIELA SCHMAEDECKE
DATA : 15/12/2021
HORA: 14:00
LOCAL: por participação remota
TÍTULO:

Genetic diversity of white-lipped peccaries (Tayassu pecari) in different landscapes from Atlantic Forest, Pantanal, and Cerrado

PÁGINAS: 100
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Anthropogenic activities cause habitat loss and fragmentation, reducing the size and causing isolation of populations of different species. Small and isolated populations suffer from higher genetic drift and inbreeding and, consequently, with the loss of genetic diversity and adaptive capacity, which increases the risk of extinction. However, such problems are minimized when the effective population size is high, and the connectivity between populations is maintained, favoring gene flow between them. Therefore, population genetic variability and their long-term survival are maintained. The maintenance of viable population sizes and gene flow between populations depends on the composition and configuration of the landscape where these populations are located. The objective of this work was to study not only genetic population status of white-lipped peccary (Tayassu pecari), but also the relationship between genetic variables from studied populations and the landscape features where these populations occur. Regarding genetic population status of white-lipped peccaries, a high degree of genetic differentiation was found among three populations from the Atlantic Forest, contrasting with high historical migration rates, estimated using a coalescence method. Low current genetic diversity and low effective population sizes compared to those estimated in the past were detected for these three populations, which was consistent with evidence of recent population bottlenecks and inbreeding. Furthermore, studied populations are losing genetic diversity compared to the population from a better preserved area of the Pantanal. Landscape genetics analyzes for populations from the Atlantic Forest, Pantanal and Cerrado, revealed that effective population size was smaller in areas with a high density of paved roads. Population isolation, measured by the number of private alleles, was greater in areas with low hydrographic density and high human population density. Higher inbreeding coefficients were associated with agricultural expansion. Thus, paved roads, human presence and agriculture are anthropogenic impacts that compromise long-term genetic viability of white-lipped peccary populations, increasing the chances of extinction. Therefore, mitigation actions to minimize the effect of human structures and activities on white-lipped peccary populations are extremely necessary to ensure the species' viability.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1908726 - CIBELE BIONDO
Membro Titular - Examinador(a) Externo ao Programa - 1247586 - ANGELA TERUMI FUSHITA
Membro Titular - Examinador(a) Externo à Instituição - FLAVIA TORRES PRESTI
Membro Titular - Examinador(a) Externo à Instituição - BRUNO HENRIQUE SARANHOLI - UFSCAR
Membro Titular - Examinador(a) Externo à Instituição - MARINA CORRÊA CÔRTES - UNESP
Membro Suplente - Examinador(a) Interno ao Programa - 1658925 - SIMONE RODRIGUES DE FREITAS
Membro Suplente - Examinador(a) Externo à Instituição - JULIA EMI DE FARIA OSHIMA - USP
Membro Suplente - Examinador(a) Externo à Instituição - ALEXANDRA SANCHES - UFSCAR