Banca de QUALIFICAÇÃO: ISABELA FREITAS OLIVEIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ISABELA FREITAS OLIVEIRA
DATA : 26/10/2016
HORA: 14:00
LOCAL: Sala Didático I do Departamento de Ecologia da UFRN
TÍTULO:

Living in the city: Fruit-feeding butterflies in an urban landscape


PALAVRAS-CHAVES:

Urbanization, Lepidoptera, Public Plazas, Community.


PÁGINAS: 50
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

With population growth and city expansion, the influence of the urbanization process on biodiversity has become an inportant topic of ecological studies. Green areas among the buildings and streets tend to behave like islands, serving as refugia for many species. This study aimed to understand the factors that determine the structure of fruit-feeding butterflies assemblages in public squares and the influence of large areas preserved (the Dunes Park and City Park) in the dynamics of butterflies in public plazas. Eighteen plazas were selected within three distance categories to Dunes Park: Layer 1 (0-1000 m), Layer 2 (1001-2000 m) and Layer 3 (2001-3000 m). Within each distance layer, we selected, two small (1000-3000 m2), two medium (3001-5001 m2) and two large (> 5001 m2) plazas. Three sampling sites in Dunes Park were chosen as control. We capture 617 individuals of 13 species of fruit-feeding butterflies. We collected 475 individuals of 9 species in the plazas and 142 individuals of 12 species in the State Park. Rarefaction curves showed that the State Park supports more species than the plazas. Species richness was not significantly different between plazas located at diferente distances from the Park nor among plazas of diferente sizes. Using the AIC method it was possible to select the best models which predicts richness and abundance of species in public squares. For richness, the best model that explained the number of species in public plazas was the null model, followed by a model that included number of fruit trees and distance to City Park. For species abundance, the model that best explained the number of individuals in plazas included number of fruit trees, percent vegetation cover and distance to Dunes Park. Significant differences were recorded in species composition between plazas and park, showing species habitat preference. The Mantel test showed no significant correlation between similarity of species and geographical distance between plazas. These results indicate that the number of fruit trees and proximity to a potential source are the most important factors for butterflies presence, given that fermented fruits are resources for adults and that species may be associated with protected areas. The low number of species found in the city is a reflection of a consistent local homogeneity of a nearly impervious matrix. We found that during the rainy season, the abundance and species richness was higher in plazas, revealing that when rainfall increases, the matrix becomes more permeable, allowing individuals movement and even the appearance of species classified as "forest".


MEMBROS DA BANCA:
Presidente - 1451741 - MARCIO ZIKAN CARDOSO
Interno - 1837921 - ALEXANDRE FADIGAS DE SOUZA
Interno - 1914239 - MIRIAM PLAZA PINTO
Notícia cadastrada em: 19/10/2016 14:48
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