Banca de QUALIFICAÇÃO: PHOEVE MACARIO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : PHOEVE MACARIO
DATA : 08/11/2018
HORA: 14:00
LOCAL: Sala de Reuniões - Administração do CB
TÍTULO:

Influence of dry years on the survival, density and reproduction of granivorous birds in the Caatinga

PALAVRAS-CHAVES:

Avian life history, population parameters, reproductive biology, robust design, seasonally dry tropical forest.

PÁGINAS: 56
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Despite the establishment of patterns that explain the latitudinal variations in avian life history, little is known about the evolution of its traits on seasonal tropical environments. The strong seasonality of these environments is related to rainfall, implying in annual drought periods. In addition, seasonal tropical environments have atypical climate variations, being possible cycles with extremely dry years. As a result, limiting the availability of food, shelter and nesting sites, changing the bird population dynamics. An example of seasonally dry tropical ecosystem little studied is the Caatinga. This biome is exclusively from Brazil and presents a variable and stressful rainfall regime, where in many regions the annual rainfall does not exceed 500 mm. Thus, our objective was estimate population and reproductive parameters of granivourous birds in a Caatinga area in Rio Grande do Norte, Brazil, assessing the hypothesis that these parameters are influenced by seasonality, rainfall or severe drought happened in Northeastern in 2012. We choose three bird species as models: the passerine Grassland Sparrow (Ammodramus humeralis), the Plain-breasted Ground-dove (Columbina minuta) and the Picui dove (Columbina picui). We used MARK program to data analyses, which orders the generated models based on Akaike information criterion (AIC). In Chapter 1 we estimate the survival and population size of Grassland Sparrow. The ranked highest model was that one considered constant survival, with 39% weight (AICw). Therefore, we quit the hypothesis there would be less chance of surviving during the 2012 severe drought. We attribute this result to a trade-off between survival and reproduction, since environmental conditions generated during the severe drought period have changed the environment and, possibly, compromised reproduction of the species in the study area. Due to the absence of reproductive cost, the population kept constant survival even in extreme drought conditions. In Chapter 2 we estimate the population density of C. picui and C. minuta doves in two Caatinga physiognomys. There were greater estimates in shrubby area than in arboreal area. The peak was checked in the 2013 rain season, when the rainfall in the region reached a level close to expected. The high density rates observed after the dry period can be related to a high recruitment of juvenile to the adult population. In Chapter 3 we carried out a study of reproduction biology of two Columbidae species. We estimate the daily nest survival and reproductive success by assessing the influence of height, support plant and camouflage level.

MEMBROS DA BANCA:
Presidente - 1439088 - MAURO PICHORIM
Interno - 1718346 - EDUARDO MARTINS VENTICINQUE
Interno - 1545394 - FULVIO AURELIO DE MORAIS FREIRE