Banca de DEFESA: IZABELA SANTOS DIAS DE JESUS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : IZABELA SANTOS DIAS DE JESUS
DATA : 28/05/2021
HORA: 10:00
LOCAL: Salvador, Bahia, Brasil
TÍTULO:

Unraveling relationships and inferring the biogeographic history of a group of herbaceous bamboos from the
Northeast Atlantic Forest (Piresia: Olyreae: Bambusoideae)

PALAVRAS-CHAVES:

climatic changes, homoplasy, incomplete lineage sorting, Olyrinae, topological incongruence.

PÁGINAS: 120
GRANDE ÁREA: Ciências Biológicas
ÁREA: Zoologia
RESUMO:

Phylogenies with incongruent topologies commonly reflect different evolutionary processes that genes and species
may undergo, especially within low-resolution groups, such as Piresia, a South American herbaceous bamboo
genus. Diversification in Piresia is likely recent and associated with hybridization, polyploidization, sympatric
speciation and tropical forest dynamics; likely creating intricate phylogenetic relationships with paraphyletic/cryptic
species. This study explored phylogenetic reconstructions, using gene and species trees from different molecular
markers to better estimate relationships within the genus, especially in the Atlantic Forest (AF), the most
problematic lineage. We applied a biogeographic approach to understand the processes influencing the
evolutionary history of the genus. We recovered the disjunction between species from the Amazonia (AM) and AF,
and the low taxonomic resolution within the latter. However, our analyses indicated that divergence between
datasets may be associated with plastidial DNA homoplasy. Therefore, we suggest the non-inclusion of certain
markers in future studies. Moreover, the incongruence between gene and species trees confirms the
paraphyletism of a well-defined species, P. leptophylla, probably by incomplete lineage sorting or differential
selective pressures associated with climatic adaptation, suggesting this species need recircumscription. The
biogeographic analyses indicate that Piresia originated during the Pliocene, diversified in the Pleistocene, probably
influenced by climatic fluctuations.

MEMBROS DA BANCA:
Externo(a) à Instituição - LYNN G. CLARK
Externo(a) ao Programa - 1396643 - MARIA LUIZA SILVEIRA DE CARVALHO
Externo(a) ao Programa - 717.292.675-72 - REYJANE PATRICIA DE OLIVEIRA - NENHUMA