Banca de DEFESA: NADINNI OLIVEIRA DE MATOS SOUSA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : NADINNI OLIVEIRA DE MATOS SOUSA
DATE: 28/10/2022
TIME: 14:00
LOCAL: Videoconferência
TITLE:

"Bird migration in South America: ecological factors determining the distribution and reproduction of tyrant flycatchers migrating in the region".

KEY WORDS:

austral migration, clutch size, egg size, green wave hypothesis, inter-specific competition, intra-specific competition, life history, seasonal bird migration, Tyrannidae.

PAGES: 107
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Bird migrations are a phenomenon that has long been subject of great interest in the scientific community. Mostly, research has been focused on a limited set of migratory and species systems, with an emphasis on the migratory systems from the temperate climates of the Northern Hemisphere. Only at the end of the 20th century, the diversity of migratory patterns and behaviors among species that breed and migrate in the Neotropical region was evidenced. However, significant knowledge gaps on the migration ecology of these species still remain. The comparison of migratory strategies among species derived from the same common ancestor holds a unique opportunity to assess the adaptive value of migrations. The Tyrannidae family is a suitable model for studies on migration ecology. They are largely distributed and abundant in New World and represents the family with the greatest diversity of migratory species in the Neotropical region, in addition to presenting varied and complex migratory patterns. In this context, this thesis aims to deepen the scientific knowledge about the factors that determine the migration of birds in the Neotropical region, focusing on the Tyrannidae family and on species that breed in South America. The thesis defended here is that the migration of tyrant flycatchers in South America is primary driven by seasonality in competition, not by seasonality in climate, and that species benefit from the surplus in the resources available at the breeding grounds, even when they invest more in the migration (i.e., migratory distance). In this context, this thesis is based on the following chapters: 1) Seasonal variation in competition and not ecological productivity drives the austral migration of tyrant flycatchers; 2) Clutch size associates with migration distance in South American land birds; e 3) Seasonal variation in competition affects clutch and egg size in migratory South American land birds.

BANKING MEMBERS:
Externo à Instituição - ALEJANDRO EDWARD JAHN
Interno - 1653455 - EMERSON MONTEIRO VIEIRA
Interno - 1123181 - GUARINO RINALDI COLLI
Externo à Instituição - MARCO AURELIO PIZO FERREIRA - UNESP
Presidente - 1143936 - MIGUEL ANGELO MARINI