Banca de DEFESA: BRUNO DO NASCIMENTO SOARES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : BRUNO DO NASCIMENTO SOARES
DATA : 26/02/2019
HORA: 09:00
LOCAL: sala 34 do ICBS
TÍTULO:

Assemblage of mosquitoes associated with Aquatic Macrophytes in a coastal lagoon: a spatio-temporal approach

PALAVRAS-CHAVES:

Chironomidae, Imboassica lagoon, aquatic macrophytes, Eichhornia crassipes

PÁGINAS: 50
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

Aquatic macrophytes usually proliferate in aquatic ecosystems with favorable conditions. Under such scenario, macrophytes may occupy great areas of the water surface and water column of lentic systems, playing an important ecological role in the structure and distribution of animal communities that inhabit there. In adittion,
macrophytes are sensitive to human activities . For this reason, the aim of this study was to determine the composition, species richness and abundance of mosquito larvae associated to the roots of floating macrophytes (Eichhornia crassipes), in spatio-temporal approach at Imboassica lagoon, located in Macaé city, RJ. Sampling was performed in six points with permanent stands of E. crassipes in August (winter) andDecember (summer), 2015. Chironomid larvae were collected through the sweeping method, using a "D" type net followed by a entomological scoop. Additionally, sediment samples were collected under the stands, Sampling stations were also sampled for granulometric composition and content of organic matter in the sediment in addition to total nitrogen, dissolved organic carbon, total phosphorus, orthophospates, temperature, pH, electric conductivity, dissolved oxygen, turbidity, total solids in suspension and chlorophyll a content. Abiotic variables were used to group sampling stations in winter and summer with Principal Component Analysis (PCA). Abundance was The abundance of chironomids was compared between seasons with Paired sample t-tests and species richness was compared with rarefaction curves. Permutational multivariate analysis of variance (PERMANOVA) was used to compare species composition. Finally, Analysis of Canonical Correspondence (ACC) was performed to describe which environmental variables best explained the patterns of species distribution. By the end of the study 1.539 specimens associated to the root of E. crassipes were collected(1.292 in winter and 247 in summer). Goeldichironomus, Chironomus, Culicoide, and Polypedium were the most abundant taxa. Disease vector species were not registered. No difference in abundance was detected between winter and summer. However, more species were observed in summer. Species composition did not differ between winter and summer. Finally, a positive correlation of the most abundant taxa was observed with lower temperature, and high concentrations of dissolved oxygen, total solids in suspension and chlorophyll a content. Only Chironomus displayed a positive correlation with smaller values of dissolved oxygen. Permanent stands of the macrophyte E. crassipes harbor high densities of chironomid larvae, which present high tolerance to eutrophic systems such as Imboassica lagoon.

MEMBROS DA BANCA:
Externo ao Programa - 3020848 - ALBERT LUIZ SUHETT
Presidente - 387200 - FRANCISCO GERSON ARAUJO
Interno - 1728466 - JAYME MAGALHAES SANTANGELO
Externo à Instituição - RONALDO FIGUEIRÓ PORTELLA PEREIRA