scholarly journals Suppression of allatotropin simulates reproductive diapause in the mosquito Culex pipiens

2014 ◽  
Vol 64 ◽  
pp. 48-53 ◽  
Author(s):  
David S. Kang ◽  
David L. Denlinger ◽  
Cheolho Sim
Keyword(s):  
Culex Pipiens ◽  
Reproductive Diapause

Ecological and geographical variations in the siphonal index of Culex pipiens larvae (Diptera: Culicidae)

1996 ◽  
Vol 86 (3) ◽  
pp. 281-287 ◽  
Author(s):  
E.B. Vinogradova ◽  
S.Ya. Reznik ◽  
E.S. Kuprijanova
Keyword(s):  
Water Body ◽  
Culex Pipiens ◽  
Open Water ◽  
Published Data ◽  
Strongly Correlated ◽  
Reproductive Diapause ◽  
Body Type ◽  
Underground Waters ◽  
Geographical Variations ◽  
The Mean

AbstractCulex pipiens Linnaeus is represented by two forms: the form molestus which is autogenous, stenagamous and has no reproductive diapause, and the form pipiens which is anautogenous, eurygamous and diapauses. The ecological, physiological and geographical variations in the larval siphonal index of C. pipiens (the ratio of the length of the siphon to its width at the base) was investigated using both original measurements and previously published data. In all, data were used from 259 collections from open water bodies (marshes, ditches, holes, barrels, etc.) and underground waters (house basements) in areas of Europe, Asia and part of Africa. Autogeny was studied in some cases by dissection of females. In C. pipiens the mean siphonal index was strongly correlated with ecology (water body type) and adult physiology (autogeny). In spite of high geographical and individual variation, which makes the identification of individual larvae difficult, the mean siphonal index can be used with certainty for the differentiation of populations of the two forms of C. pipiens.

scholarly journals Evidence that microRNAs are part of the molecular toolkit regulating adult reproductive diapause in the mosquito, Culex pipiens

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0203015 ◽  
Author(s):  
Megan E. Meuti ◽  
Robin Bautista-Jimenez ◽  
Julie A. Reynolds
Keyword(s):  
Culex Pipiens ◽  
Reproductive Diapause

scholarly journals MicroRNAs are likely part of the molecular toolkit regulating adult reproductive diapause in the mosquito, Culex pipiens

2018 ◽  
Author(s):  
Megan E. Meuti ◽  
Robin Bautista ◽  
Julie A. Reynolds
Keyword(s):  
Mirna Expression ◽  
Culex Pipiens ◽  
Adult Life ◽  
Epigenetic Mechanism ◽  
Day Length ◽  
Follicle Development ◽  
Endogenous Hormones ◽  
Reproductive Diapause ◽  
Adult Lifespan ◽  
Primary Mechanism

AbstractFor many arthropods, including insects, diapause is the primary mechanism for survival during unfavorable seasons. Although the exogenous signals and endogenous hormones that induce and regulate diapause are well-characterized, we still lack a mechanistic understanding of how environmental information is translated into molecular regulators of the diapause pathway. However, short, non-coding microRNAs (miRNAs) are likely involved in generating both the arrested egg follicle development and fat hypertrophy in diapausing females of the Northern house mosquito, Culex pipiens. To determine whether miRNAs might respond to changes in day length and/or regulate diapause pathways, we measured the abundance of candidate miRNAs in diapausing and nondiapausing females of Cx. pipiens across the adult lifespan. Of the selected miRNAs nearly all were more abundant in nondiapausing females relative to diapausing females, but at different times. Specifically, miR-13b-3p, miR-14-3p, miR-277-3p, and miR-305-5p were upregulated in nondiapausing females early in adulthood, while miR-309-3p and miR-375-3p were upregulated later in adult life, and miR-8-3p and miR-275-3p were upregulated both early and late in adult life. Taken together, our data demonstrate that miRNA expression is dynamic, changing across adult lifespan. Further, differential miRNA expression between diapausing and nondiapausing females of Cx. pipiens suggests that this epigenetic mechanism is part of the molecular toolkit regulating diapause.

Fine Structure of the Malpighian Tubules of the Mosquito, Culex pipiens

1971 ◽  
Vol 29 ◽  
pp. 402-403
Author(s):  
Brendan Clifford
Keyword(s):  
Fine Structure ◽  
Culex Pipiens ◽  
Stellate Cell ◽  
Malpighian Tubule ◽  
Cell Types ◽  
Instar Larva ◽  
Malpighian Tubules ◽  
Calliphora Erythrocephala ◽  
Distinct Cell ◽  
Basal Plasma

An ultrastructural investigation of the Malpighian tubules of the fourth instar larva of Culex pipiens was undertaken as part of a continuing study of the fine structure of transport epithelia.Each of the five Malpighian tubules was found to be morphologically identical and regionally undifferentiated. Two distinct cell types, the primary and stellate, were found intermingled along the length of each tubule. The ultrastructure of the stellate cell was previously described in the Malpighian tubule of the blowfly, Calliphora erythrocephala by Berridge and Oschman.The basal plasma membrane of the primary cell is extremely irregular, giving rise to a complex interconnecting network of basal channels. The compartments of cytoplasm entrapped within this system of basal infoldings contain mitochondria, free ribosomes, and small amounts of rough endoplasmic reticulum. The mitochondria are distinctive in that the cristae run parallel to the long axis of the organelle.

Insecticidal properties of extracts and phytochemicals isolated from three Egyptian plants against Culex pipiens

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
SA Abdelgaleil ◽  
T Suganuma ◽  
K Kitahara ◽  
M Fujii
Keyword(s):  
Culex Pipiens

The Scientific Basis for the Prevention of Zooanthroponoze Vector-Borne Diseases Spread by Parasitic Arthropods of the Center of the East European Plain

2020 ◽  
Vol 14 (1) ◽  
pp. 81-88
Author(s):  
Fedor I. Vasilevich ◽  
Anna M. Nikanorova
Keyword(s):  
Mathematical Models ◽  
Culex Pipiens ◽  
Preventive Measures ◽  
Mosquito Species ◽  
Natural Habitat ◽  
Piperonyl Butoxide ◽  
East European Plain ◽  
Vector Borne Diseases ◽  
Vector Borne ◽  
Kaluga Region

The purpose of the research is development of preventive measures against zooanthroponoze vector-borne diseases spread by parasitic arthropods in the Kaluga Region. Materials and methods. The subject of the research was Ixodidae, mosquitoes, and small mammals inhabiting the Kaluga Region. The census of parasitic arthropods was carried out on the territory of all districts of the Kaluga Region and the city of Kaluga. Open natural habitat and human settlements were investigated. Weather conditions from 2013 to 2018 were also taken into account. For the purposes of the study, we used standard methods for capturing and counting arthropods and mouse-like rodents. In order to obtain mathematical models of small mammal populations, a full factorial experiment was conducted using the collected statistical data. In-process testing of the drug based on s-fenvalerate and piperonyl butoxide were carried out under the conditions of the agricultural collective farm “Niva” of the Kozelsky District, the Kaluga Region, and LLC “Angus Center of Genetics” of the Babyninsky District, the Kaluga Region. Results and discussion. In the Kaluga Region, two species of ixodic ticks are found, namely, Ixodes ricinus and Dermacentor reticulatus, which have two activity peaks. Mosquito may have 3-4 generations in a year in the Kaluga region. The most common mosquito species in the Kaluga Region are Aedes communis, Ae. (Och.) togoi and Ae. (Och.) diantaeus, Culex pipiens Culex Linnaeus, 1758 (Diptera, Culicidae) (Culex pipiens): Cx. pipiens f. pipiens L. (non-autogenic form) and Cx. p. f. molestus Fors. (autogenic form), which interbreed, and reproductively isolated in the Region. The developed mathematical models make it possible to quantify the risks of outbreaks of zooanthroponoze vector-borne diseases without the cost of field research, and allow for rational, timely and effective preventive measures. Medications based on s-fenvalerate and piperonyl butoxide and based on cyfluthrin showed high insecto-acaricidal efficacy and safety.

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