Banca de DEFESA: LUCAS MENEZES SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LUCAS MENEZES SILVA
DATA : 30/06/2021
HORA: 14:00
LOCAL: O Pleistoceno no Nordeste do Brasil: filogeografia comparada de anuros associados a enclaves de Flor
TÍTULO:

The Pleistocene in Northeastern Brazil: comparative phylogeography of anurans associated with Atlantic Forest enclaves in the Brazilian semiarid

PALAVRAS-CHAVES:

Neotropics, Highlands, Brejos de altitude, Divergence, Anura

PÁGINAS: 120
GRANDE ÁREA: Ciências Biológicas
ÁREA: Zoologia
SUBÁREA: Taxonomia dos Grupos Recentes
RESUMO:

Wet and dry cyclical periods through the Pleistocene have been suggested as drivers of isolation and, consequently, divergence and expansions of populations associated with forest environments in the Neotropics. In northeastern Brazil, forests patches restricted to high altitudes led to the formation of regionally distinct ecosystems, known as “Atlantic Forest enclaves” or “brejos de altitude”. The enclaves are present in plateaus and mountains between 500-1100 meters of altitude such as in the regions of Serra da Borborema, Chapada do Araripe, Chapada do Ibiapaba and Chapada Diamantina. Amphibians represents a good model for unraveling the biographical history and identifying processes of diversification of enclaves in the Northeast region of Brazil. In this context, this thesis investigated populations of three edemic anuran amphibians of  the Atlantic Forest distributed in areas of enclaves and in lowlands: Dendropsophus oliveirai, Odontophrynus carvalhoi and Rhinella crucifer. In chapter 1, the results for D. oliveirai revealed three clusters involving areas of enclaves and lowlands above the São Francisco River; enclaves of Chapada Diamantina and lowlands between the São Francisco and Contas rivers; and below the Contas river. Temporal estimates revealed that the diversification for the group occurred during the Pleistocene. This work provides supports for a scenario of recent contact and recolonization between enclaves and lowlands during the wet phases of the Pleistocene. In chapter 2, the species O. carvalhoi and R. crucifer were used on a genomic approach using more areas of enclaves included to those north of the State of Ceará. O. carvalhoi shows population structure between enclaves associated with the Ibiapaba, Baturité, Borborema and Chapada Diamantina mountains and absence of structure between enclaves and lowland areas. R. crucifer also shows population structure between enclaves associated with the Serras da Borborema and Chapada Diamantina and absence of structure between enclaves and lowland areas. Demographic and temporal analyzes suggest population reduction and diversification events between the groups founded for the Pleistocene. Migration analyzes suggest migration scenarios between altitude areas (enclaves) split by the São Francisco River: Borborema plateau and Chapada Diamantina enclaves (including lowland areas) that have shown to have genetic similarity and historical genetic flow between them. The results for the studied species reveal a hypothetical scenario about the diversification of amphibian populations in enclaves for the Pleistocene: presence of population structure in areas associated with wetland enclaves; absence of population structure between lowland areas and enclaves except for D. oliveirai, where a genetically structured population was found below the Contas river.

MEMBROS DA BANCA:
Presidente - 1349793 - MARCELO FELGUEIRAS NAPOLI
Interno - 2133310 - DOMINGOS BENICIO OLIVEIRA SILVA CARDOSO
Interna - 3062387 - PRISCILA CAMELIER DE ASSIS CARDOSO
Externo à Instituição - MARCELO COELHO MIGUEL GEHARA
Externo à Instituição - MIRCO SOLÉ KIENLE - UESC