scholarly journals Aedes (Stegomyia) aegypti L. e a culicideofauna associada em área urbana da região sul, Brasil

1993 ◽  
Vol 27 (5) ◽  
pp. 326-333 ◽  
Author(s):  
José Lopes ◽  
Mario A.N. da Silva ◽  
Angela M. Borsato ◽  
Vania D.R.B. de Oliveira ◽  
Francisco J. de A. Oliveira
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Aedes Fluviatilis

Foram mostrados alguns aspectos sobre a ecologia de 11 espécies de Culicidae que procriam em recipientes, em uma área urbana do Sul do Brasil. Os mais variados tipos de recipientes foram listados como eficientes criadouros para larvas de culicídeos. Aedes aegypti apareceu como espécie recém-introduzida e limitada somente a duas áreas da cidade. As espécies predominantes foram: Culex quinquefasciatus, Culex coronator, Aedes aegypti, Aedes fluviatilis e Limatus durhamii.

ESTRUTURA DE COMUNIDADES E ESPÉCIES INDICADORAS DE CULICÍDEOS (DIPTERA: NEMATOCERA) EM AMBIENTES COM DIFERENTES GRAUS DE IMPACTO AMBIENTAL

2020 ◽  
Vol 24 (04) ◽  
pp. 856-868
Author(s):  
Daiana Aparecida Dias ◽  
◽  
Fernando Emmanuel Gonçalves Vieira ◽  
Dyego Leonardo Ferraz Caetano ◽  
Rubens Massafera ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Culex Quinquefasciatus ◽  
Aedes Fluviatilis

Os culicídeos são insetos hematófagos chamados de mosquitos. Eles são vetores responsáveis pela transmissão de diversos patógenos aos animais e ao homem. As fêmeas destes dípteros fazem oviposição em recipientes introduzidos pelo humano no ambiente natural. Estes reservatórios de água transformam-se em novos criadouros. Desta forma, o objetivo desta pesquisa é descrever a diversidade de espécies de culicídeos no município de Ribeirão Claro, Paraná, encontradas em criadouros artificiais instalados em ambientes com diferentes níveis de impacto antrópico. Foram instaladas armadilhas em quatro pontos da cidade com características urbanas, periurbanas, rurais e silvestres respectivamente e em cada ponto distribuíram-se três recipientes artificiais para servir de criadouros. A captura das larvas nestes recipientes foi realizada quinzenalmente, sendo o período de coleta desenvolvido de fevereiro a setembro de 2018. As métricas de comunidade realizadas foram: riqueza, abundância total e relativa, diversidade, equitabilidade, dominância e a similaridade. Também foi analisada a presença de espécies indicadoras para cada ambiente avaliado. Foram coletados 472 culicídeos imaturos, distribuídos nos taxa: Aedes aegypti (Linnaeus, 1762), Aedes albopictus (Skuse, 1894), Culex quinquefasciatus Say, 1823, Culex coronator Dyar & Knab, 1906, Toxorhynchites sp., Anopheles argyritarsis Robineau-Desvoidy, 1827, Aedes fluviatilis (Lutz, 1904) e Uranotaenia sp. A maior abundância ocorreu na área periurbana sendo a espécie Aedes aegypti a de maior ocorrência. Foram apontados como bioindicadores o Aedes aegypti para o ambiente periurbano, o Aedes albopictus para a área rural e o Toxorhynchites sp. para o ambiente silvestre. A maior riqueza e diversidade foram observadas no ambiente silvestre mostrando que alterações nestes locais podem favorecer a presença de insetos de importância para a saúde pública.

scholarly journals Temporal and Spatial Blood Feeding Patterns of Urban Mosquitoes in the San Juan Metropolitan Area, Puerto Rico

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 129
Author(s):  
Matthew W. Hopken ◽  
Limarie J. Reyes-Torres ◽  
Nicole Scavo ◽  
Antoinette J. Piaggio ◽  
Zaid Abdo ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Aedes Aegypti ◽  
Metropolitan Area ◽  
Culex Quinquefasciatus ◽  
Urban Ecosystems ◽  
Life Cycles ◽  
Pathogen Transmission ◽  
San Juan ◽  
Vertebrate Species ◽  
Blood Meals

Urban ecosystems are a patchwork of habitats that host a broad diversity of animal species. Insects comprise a large portion of urban biodiversity which includes many pest species, including those that transmit pathogens. Mosquitoes (Diptera: Culicidae) inhabit urban environments and rely on sympatric vertebrate species to complete their life cycles, and in this process transmit pathogens to animals and humans. Given that mosquitoes feed upon vertebrates, they can also act as efficient samplers that facilitate detection of vertebrate species that utilize urban ecosystems. In this study, we analyzed DNA extracted from mosquito blood meals collected temporally in multiple neighborhoods of the San Juan Metropolitan Area, Puerto Rico to evaluate the presence of vertebrate fauna. DNA was collected from 604 individual mosquitoes that represented two common urban species, Culex quinquefasciatus (n = 586) and Aedes aegypti (n = 18). Culex quinquefasciatus fed on 17 avian taxa (81.2% of blood meals), seven mammalian taxa (17.9%), and one reptilian taxon (0.85%). Domestic chickens dominated these blood meals both temporally and spatially, and no statistically significant shift from birds to mammals was detected. Aedes aegypti blood meals were from a less diverse group, with two avian taxa (11.1%) and three mammalian taxa (88.9%) identified. The blood meals we identified provided a snapshot of the vertebrate community in the San Juan Metropolitan Area and have potential implications for vector-borne pathogen transmission.

scholarly journals Ligusticum sinense Nanoemulsion Gel as Potential Repellent against Aedes aegypti, Anopheles minimus, and Culex quinquefasciatus (Diptera: Culicidae)

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 596
Author(s):  
Anuluck Junkum ◽  
Wanchai Maleewong ◽  
Atiporn Saeung ◽  
Danita Champakaew ◽  
Arpaporn Chansang ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Disease Transmission ◽  
Skin Irritation ◽  
Mosquito Vectors ◽  
Plant Family ◽  
Anopheles Minimus ◽  
Human Volunteers ◽  
Nanoemulsion Gel ◽  
Fresh Preparation

Ligusticum sinense Oliv. cv. is a species of Umbelliferae (Apiaceae), a large plant family in the order Apiales. In this study, L. sinense hexane extract nanoemulsion gel (LHE-NEG) was investigated for mosquito repellency and compared to the standard chemical, N,N-diethyl-3-methylbenzamide (DEET), with the goal of developing a natural alternative to synthetic repellents in protecting against mosquito vectors. The results demonstrated that LHE-NEG afforded remarkable repellency against Aedes aegypti, Anopheles minimus, and Culex quinquefasciatus, with median protection times (MPTs) of 5.5 (4.5–6.0), 11.5 (8.5–12.5), and 11.25 (8.5–12.5) h, respectively, which was comparable to those of DEET-nanoemulsion gel (DEET-NEG: 8.5 (7.0–9.0), 12.0 (10.0–12.5), and 12.5 (10.0–13.5) h, respectively). Evaluation of skin irritation in 30 human volunteers revealed no potential irritant from LHE-NEG. The physical and biological stability of LHE-NEG were determined after being kept under heating/cooling cycle conditions. The stored samples of LHE-NEG exhibited some changes in appearance and differing degrees of repellency between those kept for 3 and 6 heating/cooling cycles, thus providing slightly shorter MPTs of 4.25 (4.0–4.5) and 3.25 (2.5–3.5) h, respectively, when compared to those of 5.0 (4.5–6.0) h in fresh preparation. These findings encourage commercially developed LHE-based products as an alternative to conventional synthetic repellents in preventing mosquito bites and helping to interrupt mosquito-borne disease transmission.

scholarly journals Behavioural response of mosquito vectors Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus to synthetic pyrethroid and organophosphorus-based slow-release insecticidal paint

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Sunil Dhiman ◽  
Kavita Yadav ◽  
B. N. Acharya ◽  
Raj Kumar Ahirwar ◽  
D. Sukumaran
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Anopheles Stephensi ◽  
Slow Release ◽  
Disease Risk ◽  
Mosquito Species ◽  
Escape Time ◽  
Behavioural Avoidance ◽  
Vector Mosquito ◽  
Contact Exposure

Abstract Background The direct toxicological impact of insecticides on vector mosquitoes has been well emphasized; however, behavioural responses such as excito-repellency and physical avoidance as a result of insecticide exposure have not been much studied. We have demonstrated the excito-repellency and behavioural avoidance in certain vector mosquito species on exposure to a slow-release insecticidal paint (SRIP) formulation in addition to direct toxicity. Methods A SRIP formulation developed by the Defence Research and Development Establishment, Gwalior, contains chlorpyriphos, deltamethrin and pyriproxyfen as active insecticides. Anopheles stephensi, Culex quinquefasciatus and Aedes aegypti mosquitoes were used to study the excito-repellency response of the formulation. The experiments were performed in a specially designed dual-choice exposure and escape chamber made of transparent polymethyl methacrylate. For the experiments, the SRIP formulation was applied undiluted at a rate of 8 m2 per kg on 15 cm2 metallic surfaces. Mosquitoes were introduced into the exposure chamber, and observations of the movement of mosquitoes into the escape chamber through the exit portal were taken at 1-min intervals for up to 30 min. Results The evaluated formulation displayed strong excito-repellency against all three tested vector mosquito species. Results showed that the ET50 (escape time 50%) for Ae. aegypti, An. stephensi and Cx. quinquefasciatus was 20.9 min, 14.5 min and 17.9 min for contact exposure (CE) respectively. Altogether in CE, the escape rates were stronger in An. stephensi mosquitoes at different time intervals compared to Ae. aegypti and Cx. quinquefasciatus mosquitoes. The probit analysis revealed that the determined ET did not deviate from linearity for both non-contact exposure (NCE) and placebo exposure (PE) (χ2 ≤ 7.9; p = 1.0) for Ae. aegypti mosquitoes and for NCE (χ2 = 8.3; p = 1.0) and PE (χ2 = 1.7; p = 1.0) treatments in Cx. quinquefasciatus. Mortality (24 h) was found to be statistically higher (F = 6.4; p = 0.02) in An. stephensi for CE but did not vary for NCE (p ≥ 0.3) and PE (p = 0.6) treatments among the tested mosquito species. Survival probability response suggested that all the three tested species displayed similar survival responses for similar exposures (χ2 ≤ 2.3; p ≥ 0.1). Conclusion The study demonstrates the toxicity and strong behavioural avoidance in known vector mosquito species on exposure to an insecticide-based paint formulation. The combination of insecticides in the present formulation will broaden the overall impact spectrum for protecting users from mosquito bites. The efficacy data generated in the study provide crucial information on the effectiveness of the tested formulation and could be useful in reducing the transmission intensity and disease risk in endemic countries.

Larvicidal and ovicidal activities of phenyl acetic acid isolated from Streptomyces collinus against Culex quinquefasciatus Say and Aedes aegypti L. (Diptera: Culicidae)

2021 ◽  
pp. 108120
Author(s):  
Appadurai Daniel Reegan ◽  
Pachaiyappan Saravana Kumar ◽  
Antony Cruz Asharaja ◽  
Chitra Devi ◽  
Sithi Jameela ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Phenyl Acetic Acid ◽  
Streptomyces Collinus

scholarly journals Registro de Culicidae de importância epidemiológica na área rural de Manaus, Amazonas

2008 ◽  
Vol 41 (6) ◽  
pp. 658-663 ◽  
Author(s):  
Maria das Graças Vale Barbosa ◽  
Nelson Ferreira Fé ◽  
Alexandre Herculano Ribera Marcião ◽  
Ana Paula Thomé da Silva ◽  
Wuelton Marcelo Monteiro ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Anopheles Darlingi

A biodiversidade da Região Amazônica inclui diversas espécies de vetores artrópodes em seus diferentes ecótopos, possibilitando o surgimento de doenças como malária, filarioses e arboviroses. De agosto de 2001 a julho de 2002, realizou-se coletas de culicídeos no domicílio, peridomicílio e nas matas da Comunidade São João, área rural de Manaus, Amazonas. Foram capturados 1.240 culicídeos, pertencentes às subfamílias Culicinae (99%) e Anophelinae (1%), somando 50 espécies. O predomínio entre as tribos foi nitidamente de Culicini, com 904 (72,9%) exemplares, destacando-se as espécies Culex usquatus (22,6%) e Culex quinquefasciatus (17,7%). Do total de culicídeos, 1.077 (86,9%) exemplares foram capturados no interior das matas, 101 (8,1%) no peridomicílio e 62 (5%) no intradomicílio. O ecótopo com maior diversidade de espécies foi a mata. Assinalou-se a presença de Anopheles darlingi, Anopheles triannulatus, Aedes aegypti, Haemagogus janthinomys e outros vetores comprovados ou potenciais.

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