Depuis 2007, le Gabon est régulièrement confronté à des infections par les virus Chikungunya (CHIKV) et Dengue (DENV). Au total, près de 4300 prélèvements provenant de patients se présentant avec un syndrome fébrile algique, en phase clinique aiguë, ont pu être collectés et analysés pour la période de 2007 à 2010. En effet, deux importantes épidémies concomitantes de CHIKV et de DENV ont sévi au Gabon (i.e. Libreville en 2007 et Franceville en 2010). Entre ces deux flambées épidémiques, de nombreux cas sporadiques d'infection à CHIKV ou à DENV ont continué à être enregistrés à travers le pays. Des cas de co-infection à CHIKV/DENV ont également été diagnostiqués lors des deux flambées épidémiques. Ces deux arbovirus se sont ainsi propagés en quelques années dans un mouvement de nord-ouest à sud-est à travers le pays. L’étude plus avancée des cas de co-infection à CHIKV/DENV a pu démontrer que ce phénomène pouvait survenir soit de manière simultanée soit séquentielle au cours du repas sanguin d'Aedes albopictus, principal vecteur du CHIKV et du DENV au Gabon.(…)En conclusion, ce travail de thèse décrit précisément la survenue brutale d’épidémies imputables à plusieurs arbovirus circulant simultanément au Gabon et responsables de nombreux cas cliniques se présentant sous la forme d'un syndrome fébrile algique. La co-circulation de ces virus suggère l’apparition d’une dynamique de type épidémique/endémique et implique un problème de santé publique latent dans cette région d’Afrique, voire dans l’ensemble de la sous-région d’Afrique Centrale. / Following to the first simultaneous Chikungunya (CHIKV) and Dengue (DENV) viruses outbreak in 2007, an active surveillance of febrile syndromes was set up in Gabon, a central African country. During a three-year period, we observed a rapid spread of CHIKV and DENV in a southward movement from north-west to south-east of the country. Indeed, CHIKV and DENV have disseminated within a non-immune population, widely favored by the extraordinary capacity of Aedes albopictus vector to colonize diverse environments and to replace local mosquito’s species. In 2010, a second outbreak occurred in Gabon with further CHIKV/DENV co-infections in both human and mosquito. This is the first documented evidence of co-infection in a wild-caught Aedes albopictus. Additionally, an underlying Zika (ZIKV) virus epidemic transmission by the same invasive vector was retrospectively recorded during the outbreak in 2007. These data reveal an unusual ZIKV natural life cycle, occurring in an urban environment and potentially representing a new arboviral emerging threat from Aedes albopictus.(…)In conclusion, these data highlighted the recent introduction and rapid dissemination of CHIKV and DENV in Gabon. The Aedes albopictus vector has shown its extraordinary capacity to sustain epidemic transmissions, leading to arboviral co-circulations (i.e. CHIKV, DENV-2, DENV-1, DENV-3, ZIKV) and notably to some CHIKV/DENV-2 co-infection cases. This multiple arboviral circulation suggests an epidemic/endemic dynamic in Gabon, involving a latent public health problem in this region of Africa.

Objectives: To evaluate the efficacy of commercially used insect repellents against Aedes aegypti stings. Material and Methods: Was used method standard the World Health Organization to evaluate the sensitivity of the mosquito by estimating the total protection time (TPT) of the repellent. The test consists of application of the product and introduction of the volunteer arm into cages containing 50 female mosquitoes, aged between five and seven days. The initial product was 10% technical grade N, N diethylbenzamine (DEET) and four formulations with different concentrations of DEET, OFF Family (7,125%), Baruel (9,5%), Expert Total : 1612043 and 16144314, Super Repelex Aerosol (11%), product based on IR3535 (Repeden Spray 12%, Jonsons Baby Lotion 12.5%), and the ICARIDINE base (Exposis Extreme Tetra 25%), by the median of each product in 6 volunteers, being three men and three women. Results: The OFF Family brand (DEET 7,125%), Baruel (DEET 9,5) and analytical DEET (10%) demonstrated a median of 30 minutes, even presenting different concentrations; Super Repelex Aerosol (DEET 11%) among the products containing DEET was the one that presented a higher median, with a TPT of 90 minutes; Expert Total (DEET 15%) (1st batch) and Expert Total (DEET 15%) (2nd batch) are shown with medians equal with a time of 60 minutes; Repeden Spray (IR3535 12%) and Johnsons baby (IR3535 12.5%) presented a median TPT of 60 and 30 minutes respectively, differing only in the degree of concentration of the active principle; Exposis Extreme (25% Icaridina) presented a median of 120 minutes, showing a superiority in relation to the other products. Conclusion: The products had a complete protection time lower than the one specified in their labels, and may leave the population that use them as a control measure against several unprotected diseases, requiring a greater number of reapplications of the products. / Objetivos: Avaliar a eficácia de repelentes utilizados comercialmente contra picadas de Aedes aegypti. Material e Métodos: Foi utilizado o método padrão da Organização Mundial da Saúde para avaliar a sensibilidade do mosquito através da estimativa de tempo de proteção completa (TPC) do repelente. O teste consiste na aplicação do produto e introdução do braço de voluntário em gaiolas contendo 50 mosquitos fêmeas, com idade entre cinco a sete dias. Foi avaliado inicialmente produto a base de N,N dietilbenzamina (DEET) grau técnico a 10% e quatro formulações com diferentes concentrações de DEET, OFF Family (7,125%), Baruel (9,5%), Expert Total (15%) lotes: 1612043 e 16144314, Super Repelex Aerossol (11%), produto a base de IR3535 (Repeden Spray 12%, Loção Jonsons Baby 12,5%,) e a base de ICARIDINA (Exposis Extreme Tetra 25%), e estimado o TPC pela mediana de cada produto em 6 voluntários, sendo três homens e três mulheres. Resultados: A marca OFF Family (DEET 7,125%), Baruel (DEET 9,5) e DEET analítico (10%) demostraram uma mediana de 30 minutos, mesmo apresentando diferentes concentrações; Super Repelex Aerossol (DEET a 11%), dentre os produtos contendo DEET, foi o que apresentou uma maior mediana, com TPC de 90 minutos; Expert total (DEET 15%) (1º lote) e o Expert Total (DEET 15%) (2º lote) mostram-se com medianas iguais com um tempo de 60 minutos; Repeden Spray (IR3535 12%) e Johnsons baby (IR3535 12,5%) apresentaram uma mediana com TPC de 60 e 30 minutos respectivamente, diferindo apenas no grau da concentração do princípio ativo; Exposis Extreme (Icaridina a 25%) apresentou uma mediana de 120 minutos, mostrando uma superioridade em relação aos outros produtos. Conclusão: Os produtos apresentaram tempo de proteção completa inferior a especificada em seus rótulos, podendo deixar a população que os utilizam como medida de controle contra diversas doenças desprotegida, sendo necessário maior número de reaplicações dos produtos para atingir a o período de proteção desejado. / São Cristóvão, SE

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Le moustique Aedes aegypti représente un problème de santé publique majeur, car il est le principal vecteur des virus de la Fièvre Jaune, de la Dengue, du Chikungunya et du Zika à l’échelle mondiale. Dans la région des Amériques, ce moustique a été introduit, depuis le continent africain au cours du XVIIème siècle. À la Martinique, entre 2013 et 2016, cette espèce a transmis de façon active les virus de le Dengue, du Chikungunya et du Zika, plaçant l’île en situation épidémique. Sur l’île, la Dengue est devenue endémique depuis près de 20 ans, avec 7 grandes épidémies (1995, 1997, 2001, 2005, 2007, 2010, 2013) ; celle de 2010 a touché près de 40 000 personnes et causé 18 décès. Le Chikungunya est apparue en Décembre 2013 et l’épidémie qui a duré jusqu’en Janvier 2015 a touché 72 520 personnes (dont 83 décès). Le Zika est apparu en Décembre 2015 et l’épidémie a duré toute l’année 2016 (36 000 cas estimés au 30 Septembre). C’est dans ce contexte de circulation active des arbovirus, et dans la volonté d’améliorer les connaissances actuelles sur la bioécologie du vecteur Ae. aegypti, qu’a été initié ce travail sur le thème « Aedes aegypti à la Martinique : écologie et transmission des arbovirus ». La détection puis la caractérisation des virus dengue et chikungunya dans les populations naturelles du moustique ont confirmé le rôle vectoriel d’Ae. aegypti. Ces résultats permettent d’envisager la mise en place d’une veille entomo-virologique dans le cadre de la surveillance des virus circulant sur l’île ; cette veille entomo-virologique pouvant avoir une application opérationnelle (contrôle de foyers émergents). Ensuite, des études portant sur l’écologie larvaire du moustique ont été initiées. L’étude physicochimique des eaux des gîtes larvaires, les retombées de deltaméthrine suite à un traitement spatial et leurs impacts sur le développement larvaire et les traits de vie du moustique ont permis de confirmé que le phénomène de résistance aux insecticides des populations locales d’Ae. aegypti est un frein dans la stratégie de lutte contre le vecteur, dans la mesure où le développement de ce dernier n’était pas affecté. À l’échelle locale, ces études combinées, visent à compléter les données et connaissances sur le moustique, en vue d’une gestion plus efficace de ce dernier et des risques sanitaires et épidémiologiques qui lui sont associés. / Aedes aegypti mosquito is a major public health problem because it is the main vector of Yellow Fever, Dengue, Chikungunya and Zika viruses worldwide. In the Americas, the mosquito was introduced from Africa during the seventeenth century. In Martinique, between 2013 and 2016, the species has actively transmitted Dengue, Chikungunya and Zika viruses, placing the island in an epidemic situation. On the island, Dengue has become endemic in nearly 20 years, with 7 major epidemics (1995, 1997, 2001, 2005, 2007, 2010, 2013); the 2010 epidemic affected almost 40,000 people and caused 18 deaths. Chikungunya virus was introduced in December 2013 and the epidemic lasted until January 2015 and affected 72,520 people (including 83 deaths). Zika virus was introduced in December 2015 and the epidemic lasted throughout 2016 (36,000 cases estimated up to September 30th). In this context of active circulation of arboviruses, and the will to improve the current knowledge on the bioecology of the vector Ae. aegypti, we initiated the work on "Aedes aegypti in Martinique : ecology and transmission of arboviruses."Detection and characterization of Dengue and Chikungunya viruses in natural populations of the mosquito have first confirmed the role of Ae. aegypti as the main vector of these arboviruses on the island. These results allow to consider the establishment of a virological monitoring tool for surveillance of viruses circulating on the island; this can have an operational application such as the control of emerging households.Then, studies of larval mosquito ecology have been initiated. Physicochemical studies of breeding sites waters, impact of deltamethrin after spatial spray and their impacts on larval development and mosquito life traits showed no effect on the general reserves of emerging adults confirmed that the phenomenon of insecticide resistance of local populations of Ae. aegypti is an obstacle in the strategy against the vector. Locally, these studies are intended to supplement data and knowledge about the mosquito, for a more efficient management of the sanitary and epidemiological risks associated.

Thesis (Ph.D.) - University of Queensland, 2004. / Program shared between two schools. Includes bibliography.

Submitted by (edna.saturno@ufrpe.br) on 2016-07-19T14:48:33Z No. of bitstreams: 1 Cristiane Maia da Silva.pdf: 1998511 bytes, checksum: 58b33e4aff3f932a9eed5c8296403044 (MD5) / Made available in DSpace on 2016-07-19T14:48:33Z (GMT). No. of bitstreams: 1 Cristiane Maia da Silva.pdf: 1998511 bytes, checksum: 58b33e4aff3f932a9eed5c8296403044 (MD5) Previous issue date: 2014-02-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The insects from culicidae family are present in different habitats since homes until places of habitation of domestics animals. The State of Pernambuco is considered endemic for various diseases transmitted by Culicidae. This is the first survey about culicids in the Municipality of Cabo de Santo Agostinho. The aim of this study was to evaluate the occurrence of different species of Culicidae in the Cabo de Santo Agostinho county located in Rainforest Zone of Pernambuco, Brazil. For this purpose, the larvae of culicidae from 3rd and 4th instars were collected weekly during the period from October 2012 to September 2013. Twenty-three artificial traps were distributed and installed in domiciliary environments, peridomiciliary and within the forest, 20 meters away between them. The larvae were collected and transported in plastic containers containing water. When the larvae arrived in the laboratory were identified. A total of 12,718 culicids larvae (average of 1059.83 specimens / month) were collected during study period. The largest number of specimens was detected in September 2013 (n = 4,084) and lowest in December 2012 (n = 86). Notably, 2,441 (19.2%), 7,098 (55.9%) and 3,179 (24.9%) larvae were collected in domiciliary, peridomiciliary environments and at forest, respectively. In relation to the placement of traps (peridomicile and forest) 8,585 (67.5%) specimens were collected on the floor and 1,692 (13.3%) in the treetop. Ten different species of Culicidae were identified, the more often was Aedes albopictus (46.45%; 5,908/12,718), Culex maxi (35.56%; 4,523/12,718) and Limatus durhami (12.58%; 1,600/12,718). Interestingly, Ae. albopictus was the only species detected throughout all the study period (average of 492 specimens / month). In distributed traps in domicile environments Ae. albopictus was responsible for 95.58% (2,333/2,441) of the samples, while the predominance in around peridomicile (floor) traps were Cx maxi (73.22%; 4,523/6,177) species and (treetop) Ae. albopictus (97.94%, 902/921). The presence of Oc. scapularis was exclusively observed in the peridomicile floor traps, demonstrating the preference of this species in this local. This is very worrying, because this specie is epidemiologically important as vector in filariasis and arboviruses transmission. Thus, there is a need of evaluate the vector competence of the Oc. scapularis population of Cabo de Santo Agostinho, Pernambuco for D. immitis, W. bancrofti and arboviruses, considering epidemiologics aspects and public health importance. Although Ae. albopictus, the most common specie in the studied area, has presented two population peaks from February to April and from June to September, it is also possible to conclude that the human and animal populations who live in studied area are exposed to culicids and pathogenics agents, especially, after the rains. Therefore, control and prevention measures of culicids should be adopted in the studied area in order to reduce the health impact of endemic species here reported. / Os culicídeos estão presentes em diferentes habitats frequentando domicílios humanos e locais de permanência de animais domésticos. O Estado de Pernambuco é considerado endêmico para diversas doenças transmitidas por culicídeos. Trata-se do primeiro levantamento de culicideos realizado na região do Cabo de Santo Agostinho, PE. O objetivo do presente estudo foi avaliar a ocorrência de diferentes espécies de culicídeos no município do Cabo de Santo Agostinho, na zona da Mata do estado de Pernambuco. Para tanto, larvas de culicídeos de 3º e 4º estádios foram coletadas, semanalmente, em criadouros artificiais no período de outubro de 2012 a setembro de 2013. Foram instaladas 23 armadilhas artificiais do tipo larvitrampa distribuídas em ambientes domiciliar, peridomiciliar e dentro da mata distando 20 metros entre elas. As larvas coletadas foram transportadas em recipientes plásticos contendo água e no laboratório foram identificadas. Um total de 12.718 larvas de culicídeos (média de 1.059,83 espécimes/mês) foi coletado durante o período de estudo. O maior número de espécimes foi detectado em Setembro de 2013 (n = 4.084) e o menor em Dezembro de 2012 (n = 86). Particularmente, 2.441 (19,2%), 7.098 (55,9%) e 3.179 (24,9%) larvas foram coletados nos ambientes domiciliar, peridomiciliar e de mata, respectivamente. Em relação ao posicionamento das armadilhas (peridomicílio e mata) 8.585 (67,5%) espécimes foram coletados no solo e 1.692 (13,3%) na copa. Dez diferentes espécies de culicídeos foram identificadas sendo Aedes albopictus (46,45%; 5.908/12.718), Culex maxi (35,56%; 4.523/12.718) e Limatus durhami (12,58%; 1.600/12.718) as mais frequentes. Curiosamente Ae. albopictus foi a única espécie detectada durante todo o período de estudo (média 492 espécimes/mês). Nas armadilhas distribuídas nos ambientes domiciliares houve predominância da espécie Ae. albopictus (95,58%; 2.333/2.441) enquanto nas posicionadas no peridomicílio (solo) predominou a espécie Cx. (Cx.) maxi (73,22%; 4.523/6.177) e (copa) Ae. albopictus (97,94%; 902/921). Nas armadilhas localizadas na mata várias espécies foram encontradas sendo Li. durhami (50,33%; 1.212/2.408) predominante no solo e Ae. albopictus no solo (38,12%; 918/2.408) e copa (55,71%; 430/771). Foi observada também a presença de Oc. scapularis, com frequência nas armadilhas instaladas no solo do peridomicílio demonstrando a domiciliação dessa espécie na área estudada, o que é muito preocupante, uma vez que essa espécie tem importância epidemiológica, pois possui competência vetorial para a transmissão de diversas arboviroses e filarioses. Conclui-se que há a necessidade, então, de avaliar o potencial vetorial da população de Oc. scapularis do Cabo de Santo Agostinho, PE para D. immitis, W. bancrofti e arboviroses considerando os aspectos epidemiológicos e a importância para saúde pública. Embora Ae. albopictus, a espécie mais frequente na área estudada, tenha apresentando dois picos populacionais, de Fevereiro a Abril e de Junho a Setembro, é possível concluir também que a população humana e animal residente na área de estudo está exposta aos culicídeos e aos agentes por eles veículados durante todo o ano, sobretudo após o período de chuvas. Portanto, medidas de controle e prevenção dos culicídeos devem ser adotadas na área estudada visando a redução do impacto sanitário causado pela endemicidade das espécies aqui reportadas.

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La Fièvre catarrhale ovine (FCO) est une arbovirose émergente en Europe depuis la fin desannées 90. Elle affecte principalement les ruminants par la piqûre de petits moucheronshématophages, les Culicoides (Diptera : Ceratopogonidae). Pendant l’été 2006, l’introductiondu sérotype 8 de la FCO, dans la région de Maastricht (Pays-Bas) a rapidement diffusé dansles Ardennes, générant de lourdes pertes pour les éleveurs de bovins et d’ovins. Cesévènements interrogent sur la capacité des Culicoides de la région paléarctique à transmettrela FCO. Ils révèlent la nécessité de mieux connaître la biologie de ces diptères.Nous avons développé successivement dans ce travail, trois axes de recherche qui se sontappuyés sur un travail de terrain réalisé principalement au sein de deux élevages situés dansles Ardennes françaises.Dans un premier temps, nous avons réalisé une expérimentation de gorgement de Culicoidesde captures et d’émergences, provenant des Ardennes, sur petits ruminants virémiques pour leBTV8. A l’issue des expérimentations, une femelle gorgée de l’espèce Culicoides obsoletus apondu et a été retrouvée faiblement positive lors de la recherche du génome du virus de laFCO. Les résultats obtenus ainsi que les difficultés rencontrées lors de la réalisation de cetype d’expérimentation sont discutés.Le deuxième travail exposé s’est intéressé au comportement trophique des Culicoides parl’étude de l’origine du repas sanguin de femelles de Culicoides piégées dans des biotopesvariés. A cette fin, nous avons utilisé des marqueurs moléculaires pour amplifier l’ADN devertébré présent dans les estomacs de femelles gorgées. Ces analyses ont permis de mettre enévidence que des espèces appartenant aux complexes Obsoletus, Pulicaris, ou encore,Culicoides dewulfi, avaient un spectre d’hôte large. Certaines d’entre elles peuvent se gorger àla fois sur les ruminants domestiques et sur la faune sauvage. De plus, ce type d’étuderenseigne sur l’écologie des différentes espèces de Culicoides.Enfin, nous présentons les résultats d’une étude faunistique fondée sur des captures avec despièges lumineux, mais aussi, des prélèvements de boue pour la recherche des gîtes larvaires.Les résultats de piégeages entre les deux exploitations ont été comparés, notamment en termesde biodiversité, et sont discutés en regard des différences de pratiques d’élevage entre lesdeux exploitations choisies d’une part, et la mise en évidence des gîtes larvaires d’autre part.De nombreuses espèces de Culicoides ont émergé au laboratoire à partir des prélèvements deboues, qui ont été caractérisés macroscopiquement. Les gîtes larvaires de C. obsoletus, peuconnus jusqu’alors, ont été mis en évidence dans les deux fermes. Ils ont fait l’objet d’un suivisur plusieurs mois.L’ensemble de ces études contribue à la meilleure connaissance des Culicoides présents dansles Ardennes et de leur biologie, elles permettent de rendre compte des espèces qui semblenttrès inféodées à l’élevage de bovins, et celles qui sont plus ubiquistes. Certains travauxprésentés pourraient être poursuivis pour mettre en évidence les espèces ou populations deCulicoides plutôt sylvatiques, et pour mettre en place de nouvelles expérimentations sur lacompétence et la capacité vectorielle des Culicoides. / Since the late 90’s, Bluetongue disease (BT) can be considered as an emerging arbovirose inEurope. This disease is mainly transmitted to ruminants by the bites of minute size midges,the Culicoides (Diptera: Ceratopogonidae), also known as biting midges. An outbreak of BTserotype 8 occurred during summer 2006, in the region of Maastricht (Netherlands) andspread quickly to the Ardennes region. The epizooty lead to severe losses in cattle and sheepholdings. These events highlighted the lack of knowledge on the vectorial capacity ofpaleartic Culicoides species, and more generally on their biology.Three approaches are successively treated in this document. They are all based on field workconducted mainly in two holdings located in the Ardennes region.First, an experiment to assess oral susceptibility of Culicoides to Bluetongue virus (BTV) 8was undertaken. Field collected and emerging Culicoides coming from the Ardennes wereengorged on viremic small ruminants. At the end of the experiments, one Culicoides obsoletusfemale was found bloodfed and laid eggs. She was tested for BTV and was found weaklypositive for BTV genome. This result and the difficulties met during the experiment havebeen discussed.The second study focused on the bloodmeal origin of engorged females of Culicoides. Thesewere collected by light traps set in different kinds of environment. Molecular markers wereused in order to amplify the DNA of vertebrates present in the stomach of bloodfed females.Some of the species processed belonging to the Obsoletus or the Pulicaris complex, andCulicoides dewulfi fed on a wide variety of hosts, including domestic ruminants and wildanimals. Moreover, this kind of study brings information on the ecology of different speciesof Culicoides.Finally, a faunistic survey is presented. It was achieved through light trap collections ofmidges and also thanks to the sampling of potential breeding sites. Biodiversity in thecollection of midges captured by light traps between the two holdings were compared.Differences observed are discussed taking into account the differences in breeding practicesbetween the two holdings and the breeding sites investigations. Numerous species ofCulicoides emerged in the laboratory from soil samples which were macroscopicallydescribed. Breeding sites of C. obsoletus, which were not well documentated in the literature,were found in both farms. These were monitored over some months.This work contributes to a better knowledge of the Culicoides present in the Ardennes andtheir biology. It highlights the species which are closely related to the cattle holdingenvironment, and those which are ubiquist. Some of these studies could be continued in orderto highlight the species more related to the forested areas, and to set new experiments onvectorial competence and capacity.

Made available in DSpace on 2014-12-17T15:54:57Z (GMT). No. of bitstreams: 1 GlauciaOF_DISSERT.pdf: 4217190 bytes, checksum: 41f7567f8c73fdeb4a77a570f0e13c41 (MD5) Previous issue date: 2011-02-24 / The scarcity of occurrence records of culicid species, transmitting insects of etiologic agents for arboviruses, protozoan diseases and philarioses, and lack of information about their interactions with the forest environment make the Caatinga one of the most unknown biomes in Brazil. The aim of this study was to identify culicid species in a conservation unit located in a preserved area of the Caatinga and the possible associations with local abiotic factors, as well as characterize the natural and artificial ecotopes present in the Caatinga of Rio Grande do Norte state. The Ecological Station of Serido (ESEC-Serid?) is a Caatinga Conservation Unit located in a rural area of Rio Grande do Norte. The hot and dry climate of the Caatinga, along with a short rainy season, favor the adaptation and resistance of plants, resulting in completely distinct landscapes over the course of the year. The study took place over the course of one year, with monthly collections between 10h-12h, 14h-16h and 18h-20h. Adult mosquitoes were collected in a forest area using a manual suction trap with human bait as attractant at the three times and a Shannon trap for night collections. During the rainy season ovitraps were randomly distributed at different sites. The different capture sites were observed and photographed. Immature and adult insects captured were taken to the laboratory for identification. Of the 5081 insects collected in human-bait and Shannon traps, 75% were Mansonia wilsoni. In addition, Aedeomyia, Aedes, Anopheles, Coquillettidia, Culex, Haemagogus, Mansonia and Psorophora were identified. Of the 92 Haemagogus eggs found, 71 were collected on the banks of a reservoir. Mosquito larvae were found and photographed in an artificial breeding site of a neighboring rural area. Humidity had the greatest influence on culicid density in the Caatinga. Rain was important in the appearance of Haemagogus, Anopheles, Aedes and Psorophora. Temperature had a negative influence on Anopheles triannulatus. The occurence of important vector species of diseases in a little known preserved area of the Caatinga as well as environmental and sociocultural questions are factors that favor the emergence of transmitting insects, making these areas potential subject to the resurgence of diseases / A raridade de registro de ocorr?ncia de esp?cies de culic?deos, insetos veiculadores de agentes etiol?gicos de arboviroses, protozooses e filarioses, aliada ? inexist?ncia de informa??es sobre as intera??es destes com o ambiente silvestre contribui para tornar a Caatinga um dos Biomas mais desconhecidos do Brasil. Este estudo teve como objetivo identificar esp?cies de culic?deos em uma ?rea preservada de Caatinga, as poss?veis associa??es destes com fatores abi?ticos locais e a caracteriza??o dos ec?topos naturais e artificiais existentes na Caatinga do Serid? potiguar. A Esta??o Ecol?gica do Serid? (ESEC-Serid?) ? uma Unidade de Conserva??o da Caatinga situada em uma ?rea rural no interior do Estado do Rio Grande do Norte. O clima quente e seco com um curto per?odo chuvoso favorece a adapta??o de vegetais, resultando em paisagens distintas ao longo do ano. O estudo ocorreu ao longo de um ano, com coletas mensais, nos intervalos entre 10h-12h, 14h-16h e 18h-20h. Os mosquitos adultos foram coletados em ?rea de mata com um sugador manual com atrativo humano nos tr?s hor?rios, uma armadilha Shannon tamb?m foi utilizada nas coletas noturnas. Durante o per?odo chuvoso ovitrampas foram distribu?das aleatoriamente em diferentes pontos. Os diferentes locais de captura foram observados e fotografados. Os imaturos e adultos capturados foram levados ao laborat?rio para identifica??o. De 5081 f?meas coletadas em isca-humana e armadilha Shannon, 75% pertencem a esp?cie Mansonia wilsoni e foram identificados 8 g?neros Aedeomyia, Aedes, Anopheles, Coquillettidia, Culex, Haemagogus, Mansonia e Psorophora. Dos 92 ovos de Haemagogus encontrados, 71 foram ? margem do a?ude. Larvas de mosquitos foram encontradas e fotografadas em criadouro artificial de uma ?rea rural vizinha. O fator que mais influenciou na densidade de culic?deos na Caatinga foi a umidade. A chuva foi importante no aparecimento dos g?neros Haemagogus, Anopheles, Aedes e Psorophora. A temperatura influenciou negativamente Anopheles albitarsis. A ocorr?ncia de importantes esp?cies vetoras de doen?as em uma ?rea preservada e pouco conhecida da Caatinga associada ?s quest?es ambientais e socioculturais s?o fatores que favorecem o aparecimento de insetos transmissores, tornando essas ?reas potencialmente sujeitas ao ressurgimento de doen?as