Banca de DEFESA: PRISCILLA EVELYN DE SOUZA SILVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PRISCILLA EVELYN DE SOUZA SILVEIRA
DATE: 21/02/2022
TIME: 09:00
LOCAL: Google Meet
TITLE:

Factors affecting the molt patterns of feathers in Passerines in the far northern Atlantic Rainforest.

KEY WORDS:

molting; reprodiction; productivity; rainfall; diet.

PAGES: 51
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Feather molt in birds is a naturally occurring process due to the wearing down of old feathers. For it to occur, a large amount of energy is required, so it does not usually coincide with other events in the bird's life cycle such as breeding and migration. It is common for the moulting period to occur at a time of year when there is a greater supply of food. Factors such as primary productivity of the region and rainfall can directly affect resource availability. The Passerine order is the largest order of the bird group, and several ornithological studies are carried out with representatives of this group due to its great diversity. Our study was carried out with passerines from a restinga area, typical vegetation of the Atlantic Rainforest, which houses peculiar vegetation formations and little is known about its avifauna. Based on this, we sought to understand whether there is overlap between the moulting period and breeding, and whether there are differences in the moulting patterns due to differences in the diets of these passerines. We used a database of bird captures at CLBI, Parnamirim, RN formed between 2010 and 2014. We counted presence or absence of wing, tail, body and simultaneous wing, tail and body moulting. We also counted presence or absence of brood patch. We separated the species into four diet groups: fruit, invertebrate, invertebrate/fruit, and omnivorous. We ran GLM models to analyze which variable best explained the variation in moult frequency, and simple linear regressions to analyze the relationship between moulting and the variables studied. Our results showed that the best variable that explained the variation in moult frequency was NDVI, as a temporal variable, and the moult frequency was different between flight feathers (rems and retrizes) and body feathers, with these types of moults configuring the most explanatory biological variable. We also saw that the different diets did not influence the frequency of moulting, and that the weak overlap found between the moulting period and reproduction occurs only as a temporal coincidence, since the peak of reproduction occurs in February and the peak of the moulting period occurs in May.

BANKING MEMBERS:
Externo à Instituição - MÁRCIO AMORIM EFE - UFAL
Externo à Instituição - JOÃO PAULO TAVARES DAMASCENO
Interno - 1439088 - MAURO PICHORIM
Interna - 1914239 - MIRIAM PLAZA PINTO