transmission of western equine encephalomyelitis virus by argentine aedes albifasciatus (diptera: culicidae).aedes albifasciatus (macquart) has been considered a potential vector of western equine encephalitis (wee) virus in argentina because it has been found naturally infected, it is susceptible to infection per os, and its distribution and feeding habits are compatible with those of an epizootic and epidemic vector. ae. albifasciatus females collected in the vicinity of cordoba, argentina, were highly susceptible to wee virus perorally (id50 less than 0.5 vero cell plaque-forming units) when fed on ...19921404265
peroral susceptibility of aedes albifasciatus and culex pipiens complex mosquitoes (diptera: culicidae) from argentina to western equine encephalitis virus.the transmission cycle of western equine encephalitis (wee) virus in south america is unknown. a wee virus strain was isolated from aedes albifasciatus in argentina during the wee epizootic of 1982-83. also, culex pipiens from argentina was reported to be able to transmit wee virus experimentally, but other results indicate that cx. pipiens from the usa is refractory to this virus. we determined the susceptibility of argentina strains of ae. albifasciatus and culex pipiens complex mosquitos to i ...19902103643
arbovirus isolations from mosquitoes collected during and after the 1982-1983 epizootic of western equine encephalitis in argentina.mosquitoes were collected in santa fe and rio negro provinces, argentina, in 1982-1983 during a western equine encephalitis (wee) epizootic. totals of 153,084 mosquitoes from santa fe province and 484 from rio negro province were tested for virus in 2,351 pools. seventeen virus strains were isolated, all from santa fe collections, as follows: 4 wee, 6 venezuelan equine encephalitis, 1 st. louis encephalitis, 2 antequera, 1 maguari, 1 melao, 1 new vesiculovirus (calchaqui), and 1 gamboa. the wee ...19872880521
the use of an animal-baited net trap for collecting mosquitoes during western equine encephalitis investigations in argentina.a large net trap was used to sample mosquito populations attracted to horses at three sites each in santa fe and rio negro provinces, argentina, during the austral summer of 1984. these provinces, as well as others in argentina, were affected by a severe epizootic of western equine encephalitis (wee) during 1982-83. totals of 2,752 and 6,929 mosquitoes were collected in santa fe and rio negro provinces during five and three trap nights, respectively. culex mosquitoes of the subgenus culex were p ...19852906656
[host preference of culicidae (diptera) collected in central argentina].in order to study the host preference of female mosquitoes, samples were taken fortnightly in cordoba and cosquin (argentina), during october-april of two consecutive years. four different vertebrates were used in baited-can traps: frogs, chickens, rabbits and turtles. the genus culex accounted for 92.9% of the specimens collected. aedes for 7.0% and psorophora ciliata 0.02%. the highest proportion of females were collected in chicken traps (68.7%), followed by rabbit traps (29.9%), turtles (0.8 ...19958525319
daily pattern of flight activity of aedes albifasciatus in central argentina.aedes albifasciatus is an important common mosquito in central argentina. it is a confirmed vector of the western equine encephalitis and is responsible for loss of milk production in dairy cattle during peak populations. this paper reports the flight activity pattern of ae. albifasciatus for different seasons, in the southern coast of the mar chiquita lake (central argentina). data were collected by sampling two sites between 1992 and 1993 with cdc traps and human-bait captures. adult mosquito ...19958569480
classification of immature stage habitats of culicidae (diptera) collected in córdoba, order to classify mosquito immature stage habitats, samples were taken in 42 localities of córdoba province, argentina, representing the phytogeographic regions of chaco, espinal and pampa. immature stage habitats were described and classified according to the following criteria: natural or artificial; size; location related to light and neighboring houses; vegetation; water; permanence, movement, turbidity and ph. four groups of species were associated based on the habitat similarity by mean ...19968734943
monitoring the abundance of aedes (ochlerotatus) albifasciatus (macquart 1838) (diptera: culicidae) to the south of mar chiquita lake, central argentina, with the aid of remote sensing.surges in the size of adult populations of the flood-water mosquito aedes albifasciatus can produce important economical losses because of the way this species irritates livestock. although this species is also the main vector of west equine encephalitis in argentina, little is known about the factors affecting its population dynamics, as it is difficult to obtain data on its abundance over a large area. however, the results of intensive study of the mosquito in a few sites might reasonably be e ...19979579211
genetic structure of aedes albifasciatus (diptera: culicidae) populations in central argentina determined by random amplified polymorphic dna-polymerase chain reaction markers.the floodwater mosquito, aedes albifasciatus (macquart), is the main vector of western equine encephalomyelitis virus in argentina. previous studies on the genetic structure of this species using allozymes showed low levels of polymorphism, absence of subpopulations at distinct habitats, and moderate differentiation among localities separated up to 500 km. to examine gene flow using other genetic methods, we analyzed random amplified polymorphic dna-polymerase chain reaction (rapd-pcr) polymorph ...199910337115
effects of flooding and temperature on aedes albifasciatus development time and larval density in two rain pools at buenos aires university city.aedes albifasciatus is a floodwater mosquito that breeds in temporary waters. this semi-domestic species, widely distributed in argentina, is a competent vector of the western equine encephalitis. the present study was carried out in two rain pools of the city of buenos aires, from april 1998 through march 1999. samples were taken twice a week during the cold season and daily during the warmer months, starting from october. immature mosquitoes were collected with a dipper, being the number of di ...200011080762
spatial pattern of abundance of the mosquito, ochlerotatus albifasciatus, in relation to habitat characteristics.ochlerotatus albifasciatus (macquart) (diptera: culicidae) is the main vector of the western equine encephalomyelitis (wee) virus and potentially of other arboviruses in argentina. surges of adult population abundance during the rainy season are a nuisance, affecting milk and beef production. larvae develop in short periods in shallow temporary ground pools on fresh or brackish water. although adults seem to disperse long distances from larval habitats, little is known about their habitat prefer ...200212510888
fecundity of ochlerotatus albifasciatus from córdoba, argentina.seasonal differences in the number and length of gonotrophic cycles of ochlerotatus albifasciatus were determined in a temperate area of argentina, in addition to analysis on number of eggs laid by females corresponding to the number of bloodfeedings per gonotrophic cycle throughout the year. landing females were collected by using human bait and mechanical aspirators along the southwestern coast of mar chiquita lake (in northeastern córdoba province) from february to november 2000. collected fe ...200415669375
host range and specificity of an argentinean isolate of the aquatic fungus leptolegnia chapmanii (oomycetes: saprolegniales), a pathogen of mosquito larvae (diptera: culicidae).an isolate from argentina of the fungal mosquito pathogen leptolegnia chapmanii (arsef 5499), was tested against 12 species of mosquito larvae and on species of non-target aquatic invertebrates and vertebrates. the mosquito species tested were aedes aegypti, anopheles sp., culex apicinus, cx. castroi, cx. dolosus, cx. pipiens, cx. renatoi, isostomyia paranensis, ochlerotatus albifasciatus, oc. crinifer, psorophora cyanescens, and p. ferox. mosquito larvae of 10 species were susceptible, with mor ...200415702269
genotype iii saint louis encephalitis virus outbreak, argentina, 2005.twenty-six years after it was last detected, saint louis encephalitis virus (slev) genotype iii reemerged in 2005 in c6rdoba, argentina, where it caused an outbreak. two genotype iii slev strains were isolated from culex quinquefasciatus. a 71.43% prevalence for neutralizing antibodies was found in domestic fowl in the homestead of a patient with encephalitis.200617283629
predicting the spatial distribution of ochlerotatus albifasciatus (diptera: culicidae) abundance with noaa imagery.ochlerotatus albifasciatus is a vector of western equine encephalomyelitis in argentina and a nuisance mosquito affecting beef and dairy production. the objective of this study was to analyze whether environmental proxy data derived from 1 km resolution noaa-avhrr images could be useful as a rapid tool for locating areas with higher potential for oc. albifasciatus activity at a regional scale. training sites for mosquito abundance categories were 3.3x3.3 km polygons over sampling sites. abundanc ...200717997874
anopheles (nyssorhynchus) pictipennis: a new mosquito record from the atacama region of northern chile.we report the first collection of anopheles pictipennis from northern chile, particularly sectors of totoral, perales, puerto viejo, and salinas in the atacama region. adults were captured using human bait, while larvae and pupae were collected from various habitats including ponds, puddles left by overflowing river water, edges along river banks, wells, irrigation ditches, and permanent and semipermanent ground water. associated species were culex (culex) quinquefasciatus and ochlerotatus albif ...200818939700
strelkovimermis spiculatus n. sp. (mermithidae: nematoda) parasitizing aedes albifasciatus mac. (culicidae: diptera) in argentina.strelkovimermis spiculatus n. sp. (mermithidae: nematoda), a parasite of the mosquito aedes albifasciatus mac. in argentina, is described. diagnostic characters of this species include a ventrally shifted mouth opening and spicules fused at the tips. the mermithid has been reared on culex pipiens l. larvae in the laboratory.198619294184
rapid molecular detection methods for arboviruses of livestock of importance to northern europe.arthropod-borne viruses (arboviruses) have been responsible for some of the most explosive epidemics of emerging infectious diseases over the past decade. their impact on both human and livestock populations has been dramatic. the early detection either through surveillance or diagnosis of virus will be a critical feature in responding and resolving the emergence of such epidemics in the future. although some of the most important emerging arboviruses are human pathogens, this paper aims to high ...201222219660
culicidae (diptera) selection of humans, chickens and rabbits in three different environments in the province of chaco, argentina.studies were conducted to determine the selection of humans, chickens and rabbits by culicidae in three different environments in the province of chaco, argentina. mosquitoes were collected fortnightly using cylindrical metal traps containing animal bait (chickens and rabbits). the mosquitoes were collected between june 2001-may 2002. during the same period and with the same frequency, mosquitoes biting the human operators of the traps were collected during the first 15 min of exposure within di ...023903970
an insight into the sialome of blood-feeding nematocera.within the diptera and outside the suborder brachycera, the blood-feeding habit occurred at least twice, producing the present day sand flies, and the culicomorpha, including the mosquitoes (culicidae), black flies (simulidae), biting midges (ceratopogonidae) and frog feeding flies (corethrellidae). alternatives to this scenario are also discussed. successful blood-feeding requires adaptations to antagonize the vertebrate's mechanisms of blood clotting, platelet aggregation, vasoconstriction, pa ...201020728537
characterisation of culex quinquefasciatus (diptera: culicidae) larval habitats at ground level and temporal fluctuations of larval abundance in córdoba, argentina.the aims of this study were to characterise the ground-level larval habitats of the mosquito culex quinquefasciatus, to determine the relationships between habitat characteristics and larval abundance and to examine seasonal larval-stage variations in córdoba city. every two weeks for two years, 15 larval habitats (natural and artificial water bodies, including shallow wells, drains, retention ponds, canals and ditches) were visited and sampled for larval mosquitoes. data regarding the water dep ...024037200
a comparative study of the effect of multiple immersions on aedini (diptera: culicidae) mosquito eggs with emphasis on sylvan vectors of yellow fever virus.the effect of multiple immersions on haemagogus janthinomys , haemagogus leucocelaenus , aedes albopictus and ochlerotatus terrens eggs was studied. eggs were collected in april, june, october and december of 2011 in minas gerais, brazil. most of the aedes and ochlerotatus eggs hatched upon the first immersion, while haemagogus eggs showed a varied instalment hatching response. the number of immersions required for hatching increased for eggs collected closer to the dry winter season.201324626304
population dynamics.this chapter reviews aspects of population dynamics that may be conceptually important for biological control of mosquitoes. density dependent population regulation among immature stages has important implications for biological control of mosquito populations, primarily because it can lead to compensatory or overcompensatory mortality due to additions of a biological control agent. this can result in control efforts leading to no change in the target population, or actual increases in the targe ...017853611
the sublethal effects of the entomopathic fungus leptolegnia chapmanii on some biological parameters of the dengue vector aedes aegypti.the mosquito aedes aegypti (l.) (diptera: culicidae) is the primary vector of dengue in the americas. the use of chemical insecticides is recommended during outbreaks of dengue in order to reduce the number of adult mosquitoes; however, because ae. aegypti is highly synanthropic, the use of insecticides in densely populated areas is a dangerous practice. leptolegnia chapmanii seymour (straminipila: peronosporomycetes) is an entomopathogenic microorganism that has demonstrated marked pathogenicit ...023901823
detection of orthobunyavirus in mosquitoes collected in argentina.bunyamwera virus (bunv) (bunyaviridae, genus orthobunyavirus, serogroup bunyamwera) is considered an emerging pathogen for humans and animals in american countries. the cbaar-426 strain of bunv was recovered from mosquitoes ochlerotatus albifasciatus (diptera: culicidae) collected in córdoba province (argentina), where serological studies detected high seroprevalences in humans and animals. molecular detection of orthobunyavirus was performed in mosquitoes collected in córdoba province. seventee ...201525991544
classification of immature mosquito species according to characteristics of the larval habitat in the subtropical province of chaco, classify mosquito species based on common features of their habitats, samples were obtained fortnightly between june 2001-october 2003 in the subtropical province of chaco, argentina. data on the type of larval habitat, nature of the habitat (artificial or natural), size, depth, location related to sunlight, distance to the neighbouring houses, type of substrate, organic material, vegetation and algae type and their presence were collected. data on the permanence, temperature, ph, turbidity, ...201121739026
detection of allergens in aedes albifasciatus mosquito (diptera: culicidae) extracts by immunological methods.aedes albifasciatus (diptera: culicidae) is the most common mosquito species in argentina and it has been demonstrated to be the vector for some pathogens. the objective of this study was to describe the allergen composition of this mosquito species endemic to argentina using sds-page and immunoblotting methods. sera from mosquito-bite allergic subjects were employed. the protein extracts, obtained from thoraxes containing salivary glands, showed a protein pattern with components of apparent mol ...201310412678
mosquito iridescent virus: new records from nature and infections using strelkovimermis spiculatus (mermithidae) as a vector under laboratory conditions.iridoviridae is a dna virus family that affects both vertebrates and invertebrates. immature aquatic stages of many dipteran species infected with iridovirus have been found in different places worldwide. the most represented genera of the culicidae family are aedes and psorophora. to date, sixteen species of aedes naturally infected with iridoviruses have been reported. moreover, there are four records for the genus psorophora, one for culiseta, and two for culex. in this paper, we report two n ...202031903519
a predation record of nabis paranensis (hemiptera: heteroptera) over aedes albifasciatus.aedesalbifasciatus is one of the most widely distributed mosquitoes in the southern cone of south america, and a known vector of western equine encephalomyelitus. despite its wide range of distribution and relatively large abundance over its distribution, little is known about the ecological interactions in adults. in this contribution we record the first predation record of the damselbug nabis paranensis (nabidae) over an adult male of a. albifasciatus. the interaction record is analyzed and di ...201931442125
mosquito (diptera: culicidae) larval ecology in natural habitats in the cold temperate patagonia region of argentina.knowledge of immature habitats is an important focus for investigations of mosquito community ecology, and may improve our understanding of how environmental variables increase risk of mosquito-borne diseases by influencing the distributions and abundances of species. in patagonia region, where climatic and ecological factors could be only borderline suitable for mosquito development, relatively little is known about larval ecology. the present study focuses on associations of environmental cond ...201931064397
bacillus wiedmannii biovar thuringiensis: a specialized mosquitocidal pathogen with plasmids from diverse origins.bacillus cereus sensu lato also known as b. cereus group is composed of an ecologically diverse bacterial group with an increasing number of related species, some of which are medically or agriculturally important. numerous efforts have been undertaken to allow presumptive differentiation of b. cereus group species from one another. fcc41 is a bacillus sp. strain toxic against mosquito species like aedes aegypti, aedes (ochlerotatus) albifasciatus, culex pipiens, culex quinquefasciatus, and culex ...201830285095
effect of diet composition on the development of the floodwater mosquito ochlerotatus (ochletotatus) albifasciatus (macquart) (diptera: culicidae).one important step for the colonization of ochlerotatus albifasciatus (macquart) is to determine the optimal conditions for larval rearing, which makes possible the development of experiments comprising larval rearing in the laboratory. in this research the effect of diet composition on the development of o.albifasciatus was studied. for this purpose, cohorts of 20 first instars were reared using five diets: 1:1 mix of yeast and tetramin(r), 1:1 mix of fine and coarse organic matter, grass cuts ...200819169563
age structure of adult mosquito (diptera: culicidae) populations from buenos aires province, order to detect seasonal trends in the age structure of adult mosquitoes from buenos aires province, argentina, female populations were sampled with cdc traps during 1989-1991 in punta lara and la plata. the mosquitoes were dissected and age-grouped according to ovarian tracheation and ovariolar stages. all runchomyia paranensis females were parous, suggesting that this species could be autogenous. aedes albifasciatus showed parous peaks following population peaks, with shorter delays in spri ...19979332579
immature mosquitoes associated with urban parklands: implications for water and mosquito management.the aim of the present study was to compare 2 urban habitat types: pools artificially filled with water from damaged or leaking water pipes (af) and pools naturally filled by rainwater (nf), with regard to their favorability as breeding sites for mosquitoes. two study areas were analyzed, 1 for 5 months and the other for 9 months, covering the whole period when af pools contained water. the af pools held water during the entire study, and showed lower fluctuations in surface area than nf pools. ...201323687852
epizootiological studies of amblyospora albifasciati (microsporidiida: amblyosporidae) in natural populations of aedes albifasciatus (diptera: culicidae) and mesocyclops annulatus (copepoda: cyclopidae) in a transient floodwater habitat.the epizootiology of the microsporidium amblyospora albifasciati was studied in natural populations of its definitive host, a multivoltine, neotropical, floodwater mosquito, aedes albifasciatus, and its intermediate copepod host, mesocyclops annulatus, in an ephemeral floodwater habitat during a 12-month period. a. albifasciati was enzootic in mosquitoes. vertically (transovarially) transmitted meiospore infections occurred regularly and were detected in five of eight larval broods but the preva ...200111161996
winter biology of aedes albifasciatus (diptera: culicidae) from córdoba, females of aedes albifasciatus (macquart) were collected from april to september 1997, kept under seminatural conditions, and offered sugar solution and blood. daily survival of females ranged from 0.91 to 0.96, with blood fed females living longer than sugar fed females. overall, 43% of engorged females completed a gonotrophic cycle, and 15% of them refed and completed a second gonotrophic cycle. the life expectancy of females emerging at the end of summer was longer than those tha ...200111296832
[population seasonality of the inmature stages of aedes albifasciatus (diptera: culicidae) in buenos aires province, argentina].aedes albifasciatus, a floodwater mosquito, is widely distributed in freshwater habitats in argentina. at high population densities it is an important pest in urban areas. a two year study was conducted in a natural population of a. albifasciatus around la plata area, buenos aires province, argentina. the breeding site was weekly sampled from may, 1996 to april, 1998. immature stages of a. albifasciatus were collected with a standard 300 ml dipper. each sample unit consisted of 100 dipper. highe ...200611354969
ochlerotatus albifasciatus in rain pools of buenos aires: seasonal dynamics and relation to environmental variables.the immature stages of ochlerotatus albifasciatus develop in temporary pools. the present study aims at evaluating the seasonal dynamics of the aquatic stages of this mosquito, also analyzing the relationship among their presence and breeding success to some relevant climatic and environmental variables in the ephemeral rain pools of an urban park. nineteen cohorts of o. albifasciatus that developed synchronously after rain events were recorded in all seasons. the proportions of mosquito-positiv ...200212386693
mortality in immatures of the floodwater mosquito ochlerotatus albifasciatus (diptera: culicidae) and effects of parasitism by strelkovimermis spiculatus (nematoda: mermithidae) in buenos aires province, tables were constructed for six cohorts of immature stages of the floodwater mosquito ochlerotatus albifasciatus (macquart) in a park in buenos aires, highlighting the mortality attributable to the parasitic nematode, strelkovimermis spiculatus poinar & camino. two cohorts were selected to compare parasite incidence in all mosquito stages when low and high parasitism occurred. development time of oc. albifasciatus from first instar to adult was 7.7-10 days in the spring, 6 days in the summe ...200312764434
relative abundance and gonotrophic status of aedes albifasciatus (diptera: culicidae) during the autumn-winter period in córdoba province, argentina.variations in the abundance of larvae and females of aedes albifasciatus (macquart) were monitored biweekly during the autumn-winter periods of 1996 and 1997 on the southern edge of the mar chiquita lake in córdoba province. the degree of development of the primary ovarian follicles also was determined in host-seeking females. abundance of the larvae and the females were noticeably different during the 2 yr of the study and matched changes in the pattern of precipitation. although most females h ...200015218901
population dynamics of aedes albifasciatus (diptera: culicidae) south of mar chiquita lake, central argentina.spatial and temporal changes in the abundance of adult female aedes (ochlerotatus) albifasciatus (macquart) were studied using cdc miniature light traps at 7 sites along an 80-km transect parallel to the southern shore of mar chiquita lake (central argentina) during the rainy seasons between 1994 and 1997. abundance was greatest and most variable at sites near larval habitats. rainfall and an index combining rainfall and temperature predicted adult female abundance near larval habitats 7-15 d in ...200015218902
variation in the hatching response of ochlerotatus albifasciatus egg batches (diptera: culicidae) in temperate argentina.egg hatching of winter-collected ochlerotatus albifasciatus was studied for six months. batches of eggs were divided into two groups, one of them was stored in the laboratory at 23 degrees c and 12:12 photoperiod, and the other in the field under dead leaves. every month, from july to december, eggs from the two groups were flooded under both laboratory and field conditions. unhatched eggs were returned to the original condition and flooded two more times separated by ten-day intervals. results ...200616699709
long-term storage and viability of ochlerotatus albifasciatus (diptera: culicidae).the viability of ochlerotatus albifasciatus (macquart) eggs stored at room temperature and at 5 degrees c was studied over 31 months. after 12, 18 and 31 months of storage, eggs were acclimatized at 22 degrees c for ten days, and then inundated twice every seven days. the effect of the storage period on the percentage of hatching was analyzed by one way anova. differences on the hatching response between the first and second flooding were analyzed by paired t-test. differences on the hatching re ...200818327507
association of immature mosquitoes and predatory insects in urban rain pools.distribution among pools of six mosquito species and 23 predatory insect taxa were studied in temporary rain pools during the summer and fall season in buenos aires city. both mosquito immatures and predators were disproportionally more abundant in pools with high flooded surface, depth, and duration. mosquito immatures differed in their habitat use with respect to predators. among mosquitoes, ochlerotatus albifasciatus showed a different pattern when compared to the remaining culicids. more cul ...200818697306
factors affecting horizontal transmission of the microsporidium amblyospora albifasciati to its intermediate copepod host mesocyclops annulatus.factors that directly impact horizontal transmission of the microsporidium amblyospora albifasciati to its intermediate copepod host, mesocyclops annulatus were examined in laboratory bioassays. results were evaluated in relation to life history strategies that facilitate persistence of the parasite in natural populations of its definitive mosquito host, ochlerotatus albifasciatus. a moderately high quantity of meiospores from mosquito larvae was required to infect adult female copepods; the ic5 ...200919465025
scanning electron microscopy of the egg of ochlerotatus albifasciatus (diptera: culicidae).ochlerotatus albifasciatus (macquart) (diptera: culicidae) is a mosquito species of medical and veterinary importance, usually associated with temporary groundwater habitats. eggs obtained from females collected in córdoba city, in the center of argentina, were studied using scanning electron microscopy. the eggs are elliptical in outline, measuring approximately 615.7 +/- 37.24 microm in length (1) and 180.7 +/- 22.87 microm in width (w), with an egg index (l/w ratio) of 2.9-3.7. the outer chor ...200919769026
resistance to freezing temperatures in aedes (ochlerotatus) albifasciatus (macquart) eggs (diptera: culicidae) from two different climatic regions of argentina.aedes (ochlerotatus) albifasciatus (macquart) has the capacity to proliferate in different kinds of climates within its distribution range in south america. with the aim of studying local thermal adaptations of eggs, we exposed egg stocks from two climatically different localities: temperate humid pampa (buenos aires) and cold arid patagonian (sarmiento), to freezing conditions and then evaluated the effect on some features at this level. first, we thermally described the substrate where this sp ...201324581364
environmental factors related to the abundance and activity of ochlerotatus albifasciatus (diptera: culicidae) in an agricultural landscape of steppe arid climate.ochlerotatus albifasciatus (macquart) is a flood water mosquito whose highest density has been found associated both with natural landscapes (prairies or grazing fields) in temperate and subtropical regions and with rainfall events. in the current study, we aimed to find out how the marked differences between environmental factors of agricultural landscape patches in a steppe arid region affect the relative abundance of this species. in wetland patches, the high activity of adults was closely as ...201425118404
thermal response in pre-imaginal biology of ochlerotatus albifasciatus from two different climatic regions.the biological processes on mosquito could be variable in response to local climatic characteristics. the thermal effects on time and the rate larval development, immature survival and adult size in local populations of ochlerotatus albifasciatus (macquart) (diptera: culicidae) from cold (sarmiento) and temperate (buenos aires) regions from argentina were evaluated. this species affects livestock production and human health. larvae of both regions were placed in breeding thermal baths (11-32 °c ...201526147454
effects of larval density and habitat drying on developmental success of ochlerotatus albifasciatus (diptera: culicidae) in urban rain pools: evidence from field and experimental studies.ochlerotatus albifasciatus (macquart) (diptera: culicidae) larvae develop synchronously after rainfall events in ephemeral or temporary pools, where they occasionally attain very high abundance. the aims of the current study were to analyze the response of life history parameters such as daily larval mortality, time to pupation, and adult size of oc. albifasciatus to increasing larval density under controlled conditions, and to analyze the relationships of daily larval mortality with density and ...201426309304
prevalence of parasitism and adult survival time of aedes albifasciatus (diptera: culicidae) parasitized by strelkovimermis spiculatus (nematoda: mermithidae).we described the carryover of strelkovimermis spiculatus (poinar and camino) (nematoda: mermithidae) from mosquito larvae, the primary site of maturation, to adults. we analyzed the survival time of male and female aedes albifasciatus (macquart) (diptera: culicidae) parasitized by s. spiculatus, the time of emergence of nematodes from adult mosquitoes, and the state of parasitism in the same mosquito cohorts during the immature stages. mosquito larvae with single and multiple parasitism (up to 1 ...201526611976
gene flow in aedes albifasciatus (diptera:culicidae) from central estimate gene flow among populations of the floodwater mosquito aedes albifasciatus, allozymic frequencies were analyzed at 16 loci in samples from 6 localities in central argentina. expected mean heterozygosity ranged from 0.057 to 0.137. fst was significant for 5 of 11 polymorphic loci; mean value was 0.024, which gave an nm of 50.96. levels of genetic identity among samples were high (in between 0.9815 and 0.9988) even between populations 500 km apart. however, there was a significant corr ...19968961636
genetic structure of aedes albifasciatus (diptera:culicidae) from a marsh ecosystem in córdoba, argentina.allozymic variability was analyzed for 8 samples of the floodwater mosquito aedes albifasciatus (macquart) obtained in october and november 1993 from marsh and pasture habitats along the mar chiquita ecosystem in central argentina. expected mean heterozygosity among 17 loci was low. fls values were negative for all polymorphic loci, and mean fst values were low, indicating high levels of gene exchange and the absence of subpopulations within the 25-km-wide study area. genetic homogeneity through ...19968699445
morphometric variation of the aedes albifasciatus (diptera: culicidae) wings in three populations from different ecoregions of argentina.shape variability among individuals is important to understand some ecological relationships, since it provides the nexus between the genotype and the environment. geometric morphometrics based on generalized procrustes analysis was applied on 17 landmarks of the wings of aedes albifasciatus (macquart 1838) (diptera: culicidae) females collected from three ecoregions of argentina (delta and islands of the paraná river, pampa, and patagonian steppe). this methodology was used to discriminate the ...201829939291
host range of the parasite strelkovimermis spiculatus (nematoda: mermithidae) in argentina mosquitoes.strelkovimermis spiculatus (poinar and camino 1986) is a nematode parasite of mosquitoes isolated from the neotropical region. we investigated the host range of this parasite in mosquito populations for a better understanding of the dynamics of temporary breeding sites. five grassy-pool habitats filled by rainwater were sampled from the summer 2007 through the fall 2008. eight mosquito species were collected: anopheles albitarsis, culex chidesteri, culex dolosus, culex maxi, aedes albifasciatus, ...201323701609
host penetration and emergence patterns of the mosquito-parasitic mermithids romanomermis iyengari and strelkovimermis spiculatus (nematoda: mermithidae).romanomermis iyengari and strelkovimermis spiculatus are mermithid nematodes that parasitize mosquito larvae. we describe host penetration and emergence patterns of romanomermis iyengari and strelkovimermis spiculatus in laboratory exposures against culex pipiens pipiens larvae. the mermithid species differed in host penetration behavior, with r. iyengari juveniles attaching to the host integument before assuming a rigid penetration posture at the lateral thorax (66.7%) or abdominal segments v t ...023589657
first record of aedes albifasciatus in magallanes region, chile.aedes albifasciatus is known for transmitting western equine encephalomyelitis (wee), a virus that can affect humans and animals. in this work, we record for the first time ae. albifasciatus from the magallanes region in chile, as the only culicid species known from this southernmost region. although wee poses a serious problem to cattle production in neighboring argentina, no wee has been recorded in chile. the need for surveillance programs of wee in magallanes is also discussed here.201831442155
wing morphometrics of aedes (ochlerotatus) albifasciatus (macquart, 1838) (diptera: culicidae) from different climatic regions of argentina.gene flow restrictions between populations of aedes albifasciatus, the vector of western equine encephalitis and dirophilaria immitis, have been described in the central region of argentina. genetic and eco-physiological variations usually result in local forms reflecting the climatic regions. mosquito wings and their different parts have ecological functions in flight and communication. therefore, wing shape could be considered an aspect of sexual dimorphism, and its eco-physiological responses ...201829769098
body size variation of the floodwater mosquito aedes albifasciatus in central inverse relationship between larval density and adult body size has been reported for several mosquito species, affecting their survival and vector competence, response to repellents and other factors. larvae of the floodwater mosquito aedes (ochlerotatus) albifasciatus (macquart) (diptera: culicidae) develop quickly in temporary pools, so intraspecific competition (for food or space) might regulate population abundance and affect the size of adult mosquitoes. we investigated the temporal var ...200010759310
horizontal transmission of amblyospora albifasciati garcía and becnel, 1994 (microsporidia: amblyosporidae), to a copepod intermediate host and the neotropical mosquito, aedes albifasciatus (macquart, 1837).the life cycle of amblyospora albifasciati is characterized by three sporulation sequences involving the definitive mosquito host and a copepod intermediate host. meiospores of a. albifasciati were infectious per os to adult females of the copepod mesocyclops annulatus. all developmental stages in the copepod had unpaired nuclei, with sporulation involving the formation of a sporontogenic interfacial envelope and the production of a second type of uninucleate spore. these spores, formed in the o ...200010631061
temporal variation of allozyme frequencies in aedes albifasciatus (diptera: culicidae) from argentina.aedes albifasciatus is a floodwater mosquito widely distributed in argentina. it is important from economic and medical points of view. a 4-year survey of seasonal variation in allele frequencies in a population of this species was undertaken to determine possible changes in the genetic structure and their correlation with environmental conditions. significant temporal variation was detected at most of the loci, but it did not follow a cyclic or seasonal pattern. multivariate analysis of princip ...19979559091
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