Banca de DEFESA: CÁSSIO LÁZARO SILVA INÁCIO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : CÁSSIO LÁZARO SILVA INÁCIO
DATE: 31/08/2021
TIME: 14:30
LOCAL: Videoconferência
TITLE:

MOSQUITO VECTORS (DIPTERA: CULICIDAE) IN THE BRAZILIAN SEMIARID REGION: SOCIOENVIRONMENTAL, EPIDEMIOLOGICAL AND BIOECOLOGICAL FACTORS

KEY WORDS:

Culicidae; seasonally dry tropical forest; ecological relationships; Aedes aegypti; Haemagogus.

PAGES: 215
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Mosquitoes are insects present all over the planet. Currently, about 3,578 species are known. In Brazil, about 530 mosquito species are reported, and among these, some are considered vectors of disease-causing pathogens. It is estimated that about 80 species occur in Caatinga, an exclusively Brazilian biome. In the Brazilian state of Rio Grande do Norte, 76 species have already been recorded. Mosquitoes are holometabolic insects, i.e., they have complete metamorphosis, passing through the stages of egg, larva, pupa and adult. The immatures inhabit the aquatic environment, and their breeding sites are diverse, and can be natural or artificial, temporary or permanent. Adults live freely outside the water and are responsible for reproduction; they feed on carbohydrates of plant origin, however, only the females are adapted to also feed on blood. They feed on carbohydrates of vegetable origin; however, only the females are adapted to also feed on blood. This blood feeding ends up favoring the infection and transmission of pathogens. Rio Grande do Norte has been suffering over the years with epidemics of Dengue, Zika, and Chikungunya, diseases whose main vector is the Aedes aegypti. Studies on the mosquito fauna in the state are still scarce, thus requiring further research for a better understanding of the relationships of these insects in the transmission of pathogens and with the environment. In this sense, the present work sought to analyze the fauna of Culicidae in the municipality of Currais Novos in urban and preserved natural areas. In the urban area, the monthly monitoring of the Aedes aegypti population was performed with the use of ovitraps. The traps were installed weekly in the household, equidistant about 300m, and replaced every seven days. We calculated the indexes Ovitrap Positivity Index (OVI), Egg Density Index (EDI), and Mean Egg Index (MSI) for each period studied, which are important for understanding the population dynamics and reproductive period of mosquitoes. A total of 92,340 eggs were collected during the study, between May/2018 March/2020. The ovitrap positivity index showed a positive correlation with rainfall. Viral research in adult insects from eggs revealed evidence of a possible new insect-specific virus by phylogenetic inference methods: Maximum Likelihood, Maximum Parsimony, and Neighbor-Joining. In the natural area, collections were made monthly using ovitraps, active search for immatures in natural breeding sites, and Shannon traps for adult insects in the Apertados Canyon. A total of 15 taxa were found, 14 immature and 13 adult mosquitoes. The correlation of the insects with local climatic variables was observed. For immature mosquitoes, 14 breeding sites were recorded. A total of 2,342 adult mosquitoes were collected between 5pm-8pm. Haemagogus spegazzinii was the only wild species found naturally infected with arbovirus, dengue virus type 2. It was also observed that the species' cycle lasts about 14 days from hatching to adulthood. Eggs of this species can resist desiccation for 380 days, and the adults of the species can have 4 morphotypes. Thus, the present work contributes to the understanding of the human implications facing the epidemiology of arboviroses in urban and natural environments. In this aspect, the monitoring of mosquito populations helps in policies for the control and combat of these insects and with the knowledge of the relationships between mosquitoes in the semiarid region of Brazil, about the niches, bioecology, frequency, abundance, and seasonality of mosquitoes.

BANKING MEMBERS:
Externa ao Programa - 1549705 - ADRIANA FERREIRA UCHOA
Interna - 1279472 - ELIANE MARINHO SORIANO
Presidente - 350500 - MARIA DE FATIMA FREIRE DE MELO XIMENES
Externa à Instituição - MARÍLIA GABRIELA DOS SANTOS CAVALCANTI - UFPB
Externa à Instituição - PATRICIA BATISTA BARRA MEDEIROS BARBOSA - UERN