Banca de QUALIFICAÇÃO: CÁSSIO LÁZARO SILVA INÁCIO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : CÁSSIO LÁZARO SILVA INÁCIO
DATE: 19/10/2020
TIME: 14:00
LOCAL: Vídeo conferência
TITLE:

VECTOR MOSQUITOES (DIPTERA: CULICIDAE) AND THEIR RELATIONSHIP WITH THE ENVIRONMENT AND SOCIETY IN THE SEMIARID OF RIO GRANDE DO NORTE STATE

KEY WORDS:

Culicidae; tropical dry forest; ecological relationships; insect-specific virus; Haemagogus.

PAGES: 138
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Mosquitoes are insects widespread in the whole world. Currently, proximally 3.578 species are known. In Brazil, it has been recorded 530 mosquito species and among them some are considered vectors of pathogenic diseases. It is estimated the occurrence of 80 species in Caatinga, an exclusive Brazilian tropical dry forest biome. In the state of Rio Grande do Norte there are 76 recorded species. Mosquitoes are holometabolous insect, which means they present a full metamorphosis development, going through egg, larva, pupa and adults stages. The immature mosquitoes inhabit aquatic environment and their breeding grounds are diverse, from either natural or artificial, seasonal or permanents. Adults present a free-living form off water and are responsible for reproduction; they feed on carbohydrates of vegetable origin, although females are also adapted to feed on blood. Such blood feeding leads to infection and transmission of pathogenic agents. The state of Rio Grande do Norte has been dealing with of Dengue, Zika and Chikungunya epidemics, diseases which have Aedes aegypti as a vector. Studies on mosquitos’ fauna are still scarce locally, needing further researches for a broader understanding of these insects’ relationships on pathogen transmissions within their environments. Therefore, this work aimed to analyze the Culicidae fauna at the municipality of Currais Novos in urban and preserved dry forest environments. In urban environment, it was conducted monthly the monitoring of the Aedes aegypti population using ovitraps. The traps were installed weekly in household sampling sites and replaced every seven days. The ovitraps were placed 300 m distance from each other. It was calculated OPI (Ovitrap positivity index), AEI (Average egg index) indexes for each studied period. A total of 92.340 eggs were collected throughout this study, from May/2018 to March/2020.  The Ovitrap Positivity Index presented positive correlation with the rainy season. The viral research on adult insects bred from eggs, revealed evidences of a possible new insect-specific virus by phylogenetic inference: Maximum Likelihood, Maximum Parsimony, Neighbor-Joining. In the dry forest environment, specifically at the site of Cânion dos Apertados, samplings took place monthly using ovitraps, active searching for immature insects in natural breeding grounds and Shannon trap for adults. It was found a total of 15 taxa, accounting for 14 immature and 13 adult mosquitoes. It was observed the correlation of the insects and the local climatic variables. For mature insects, it was recorded 14 types of breeding grounds. It was collected 2.342 adult mosquitoes between 17h-20h interval. Haemagogus spegazzinii was the only wild species found naturally infected by the Virus DENV-2. It was also observed the species cycle takes around 14 days, from hatch to adult stage. Therefore, this work contributes to the understanding of human implications over the arboviral epidemiology in urban and dry forest environments. In addition, monitoring mosquito populations allows political actions towards controlling and mitigating these insects by knowing the relationships between existing mosquitoes in the Semiarid of Brazil, and also by understanding their niches, bioecology, frequency, abundance and seasonality.

BANKING MEMBERS:
Externa ao Programa - 1121066 - ELIZA MARIA XAVIER FREIRE
Externo ao Programa - 1161844 - HERBET TADEU DE ALMEIDA ANDRADE
Presidente - 350500 - MARIA DE FATIMA FREIRE DE MELO XIMENES
Externo à Instituição - MARÍLIA GABRIELA DOS SANTOS CAVALCANTI - UFPB