Culex pipiens

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Culex pipiens
Culex pipiens 2007-1.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Culicidae
Genus: Culex
Subgenus: Culex
Species:
C. pipiens
Binomial name
Culex pipiens

Culex pipiens is a species of mosquito commonly referred to as the common house mosquito or northern house mosquito, as it is the most common mosquito to the northern regions of the US. They can be found in both urban and suburban temperate and tropical regions across the world. [1]

Culex pipiens' diet typically consists of vertebrate blood, as they consume human blood, but prefer bird blood of species that are nearly linked to human interaction, such as doves and pigeons. [2] Furthermore, at the end of the summer and the start of the fall season before it is time for them to overwinter, C. pipiens subsist on nectar and other sugary food sources in order to store fat.

In California populations, it was shown that most females of C. pipiens do not enter reproductive diapause during the winter, which differs from other mosquito species, such as C. stigmatosoma or C. tarsalis . Most of them overwinter in a stage of host-seeking arrest. [3] The practice of overwintering tends to vary based on location, and in effect temperature and the period of time per day an organism receives sunlight, also known as the photoperiod. [3] Parous females may overwinter together with nulliparous. [4] Overwintering mosquitoes are considered as hibernating by mosquito scientists. [4]

Typically, mosquitoes copulate when temperatures are the most temperate, and many species begin breeding when temperatures reach 50 °F (10 °C). Because of this temperature condition, mosquito breeding seasons vary by region and climate characteristics of a given area.

Description

In general, C. pipiens are a pale-to-light brown color, and are adorned with lighter stripes on the abdomen. In regards to size, these organisms can range between three and seven millimeters long. [1] Culex pipiens can be distinguished by the presence of pale colored bands located on the insect's abdomen. Another distinguishing feature of the species’ appearance is its brown or grey-brown color. The insect has a proboscis, [5] an elongated mouthpart that is used for sucking up fluids. This feature, in addition to their wings, are also brown in color, matching the remainder of their body.

Anatomy of the common mosquito. Culex pipiens diagram en.svg
Anatomy of the common mosquito.

Distribution

Culex pipiens can be found in both urban and sub-urban temperate and tropical regions across the world. [2] It is prevalent on most continents, including North and South America, Europe, and some areas of Asia and Northern Africa.

Habitat

The Culex genus, and a large number of other mosquito species, thrive in mostly wet, humid, and temperate climates. In California population, it was shown that most females of C. pipiens do not enter reproductive diapause during the winter, which differs from other mosquito species, such as C. stigmatosoma or C. tarsalis. Most of them overwinters in a stage of host-seeking arrest. [3] During the winter season, they survive by living in areas where they are sheltered from the elements, such as basements or sheds. Some members of this species also spend the winter season living in caves. The practice of overwintering tends to vary based on location, temperature and the period of time per day an organism receives sunlight, also known as the photoperiod. [3] Parous females may overwinter together with nulliparous females. [4]

Larval habitats

The habitats of C. pipiens larval habitats can be divided into two categories: natural, and artificial. Natural habitats include marshes, pools, manure piles, streams, and shallow ponds. Some artificial larval habitats are barrels, sewage ditches, and intermittent puddles. [6] Many physical and chemical components of the materials that make up these habitats are critical to larval survival. Stable pH values, salt content in water, and the temperature of the habitat's environment, are all factors that can either positively or negatively influence larval survival rates. [6] The presence of organic materials typically results in positive survival outcomes for C. pipiens. Ideal environments for C. pipiens contain significant amounts of organic matter. [6]

Ecology

Culex pipiens is a pollinator of Silene otites, tansy (Tanacetum vulgare), and Achillea millefolium . [7] [8] [9] It can see in the ultraviolet range and uses UV cues on flowers to locate them. [10]

Lab studies have measured values related to the survival rates of C. pipiens in relation to pH levels, levels of organic material present in their habitats, temperature, and salinity levels. These studies showed that C. pipiens are capable of surviving all of these metrics in extreme values, demonstrating their eurytopic nature. Eurytopicity describes an organism's ability to tolerate a large range of habitat or ecological conditions. [11] According to V. V. Tarabrin and M. M. Orlov, the development from larva to imago occurs within 20–25 days.The optimal air temperature for reproduction is 26-29 °C, relative humidity is ≈ 80%, water temperature is not less than 16-17 °C. [12] [13] [14]

Life history

As all mosquito larvae live in the water, they are often referred to as “wigglers,” since they can be characterized by a wiggling type movement in the water. [15] The development period of larvae can range anywhere between seven and ten days, which is when they reach the pupal stage. In the pupal stage, the organisms spend less time feeding, and invest more time toward the surface of the water, taking in air from the exposed surface. After about one to three days in the pupal stage, the mosquito adult breaks through.

The growth rates of larvae are dependent on factors including temperature, food and water provisions, larval density and characteristics of the breeding season they are born into.

Complex

Magnified image of the C. pipiens body. CulexPipiens.jpg
Magnified image of the C. pipiens body.

The C. pipiens species complex consists of: [2]

The C. pipiens complex is characterized by its ability to thrive in mainly water-based habitats that contain high amounts of organic material. Furthermore, measured rates of success of the complex has been associated with consumption of “food” found in standing water sources that have been developed by humans and livestock. Some interspecific hybrids are widespread. [2]

As vector borne pathogen transmission is highly influenced by the ecology of the vector, [2] it is evident that C. pipiens’ ability to adapt to human-altered environments led to its global distribution as a vector. With these environmental adaptations, the species' interactions with humans and other organisms (especially birds), has also led to an increase in the number of avian pathogens that humans around the world are exposed to. [2]

Physiology

In C. pipiens, there is a strong correlation between the digestion of blood and ovary development. The cycle of blood digestion leading to ovarian developments is known as the gonotrophic cycle. [6] It occurs in three stages: finding a blood source, digesting blood, and laying eggs. Laying eggs is also referred to as oviposition. The number of cycles a female C. pipiens goes through depends on a variety of environmental factors. Each one of the gonotrophic cycles results in morphological changes in the female's reproductive organs, stomach, and throat. [6] Temperature is one environmental factor in particular that affects the rate of blood consumption and its correlation to ovary development. [6]

Diet

Culex pipiens pipiens feeding on a human host. Pipiens feeding.jpg
Culex pipiens pipiens feeding on a human host.

Culex pipiens prefer the blood of bird species that are closely linked to human interaction such as doves and pigeons; however, they do consume human blood. [17] At the end of the summer and the start of the fall season before it is time for them to overwinter, C. pipiens subsist on nectar and other sugary food sources in order to store fat. Therefore, C. pipiens consume both vertebrate blood (including human blood) as well as sugar-heavy energy sources like nectar. Only females feed on blood, while males limit themselves to sugary food sources. The time of day is also a factor that influences C. pipiens’ eating behaviors. These mosquitoes feed most frequently during the early hours of sunset. [1] Feeding on carbohydrate sources, rather than blood, helps with fat storage. [17] This is why this specific feeding behavior is seen before the winter season.

Food sources

Culex pipiens feed on a variety of different food sources. Sugar is one important source of food that provides C. pipiens with similar amounts of energy as blood does. Both males and females obtain sugar through feeding on plant sugar, floral nectar, and honeydew, which are found via olfactory and visual cues. [6] [9] [18] Female C. pipiens differ from males in the way that they consume both blood and sugar as sources of food, whereas males only rely on these sugar sources for energy. They obtain blood hosts such as birds, humans, cattle, etc. for feeding. Searching for sources of blood requires a complex of behavioral responses that influence C. pipiens sensory mechanisms that help them to locate hosts.[1][ clarification needed ] Females contain 1,300 sensory organs, while males have 1,350.[ citation needed ] Garvin et al 2018 find C. pipiens to be more attracted to adult birds than nestlings, by differentiating between uropygial gland secretions of different ages (tested in Passer domesticus ). [19]

Food procurement

There are many stages that make up C. pipiens feeding activity. These stages are known as activation, orientation, landing, and probing. [6] Locating a host requires both visual and chemical cues from the environment to allow C. pipiens to sense where the host is.

Mating

Typically, mosquitoes copulate when temperatures are the most temperate, and many species begin breeding when temperatures reach 50 °F (10 °C). Because of this temperature condition, mosquito breeding seasons vary by region and climate characteristics of a given area. Sexual activity in C. pipiens first begins within the first 2–3 days of emergence from the larval development stage. [6] Antennal fibrillae play an important role in C. pipiens mating practices. The erection of these fibrillae is considered to be the first stage in reproduction. [6] These fibrillae serve different functions across the sexes. As antennal fibrillae are used by female C. pipiens to locate hosts to feed on, male C. pipiens utilize them to locate female mates.

Fertilization

Temperature has a direct impact on the outcome of fertilization. Studies have demonstrated that female insemination relies on higher temperatures to produce successful outcomes, as colder temperatures increase the number of underdeveloped C. pipiens eggs. [6] Another factor that affects fertilization outcomes is the age of females. In 1972, Lea and Evans [6] performed a study that yielded results showing that the number of inseminated females drastically increased with age. Specifically, only females older than 18–24 hours can be successfully inseminated by a male mate. [6] Furthermore, C. pipiens is believed to be a monogamous species, mating only once (and with one partner) throughout the duration of its life.

Female rejection kicks

Courting C. pipiens males have the chance to be directly accepted by a mating female. However, there is evidence for a mating behavior performed by female C. pipiens in which females utilize rejection kicks to deter courting males away. Despite this behavior, there is evidence that courting males can still be accepted by females after these rejection kicks. According to a study done to observe this mating behavior, pursuing males are accepted by the female upon first genital contact at a rate of 38.95%, and are accepted at a rate of 17.89% after some rejection kicks from the female, [20] demonstrating that there is a chance of successful mating between male and female C. pipiens even if this rejection mechanism is performed by the female. Furthermore, the recorded success of females performing this behavior with their right limbs is higher than those who used their left. This courting behavior illustrates a behavioral mechanism for females to dismiss certain males from mating with them, and demonstrate an overall functional advantage that is associated with the use of right hind limbs over left ones.

Breeding site characteristics

Culex pipiens reproduce in bodies of water—specifically in flood-prone areas and in standing water. Other breeding sites include: natural marshes, cesspits, gutters, and other unkempt artificial water structures. [1] Furthermore, the presence of organic material in breeding grounds is essential for the larval developmental stage. All mosquito species produce larvae that live in the water. According to Daniel Markowski from the Vector Disease Control International, “Culex pipiens larvae specifically thrive in such stagnant water with the most organic material pollution". [17]

The number of larvae present in one breeding site also impacts the success rates of offspring survival. A 1973 study done by Skierska [6] analyzed the effects that larval density had on survival rates. The study showed that the highest larval survival occurred when the larvae density ranged between 20-50 organisms. [6] Within this population range, development periods of the larvae were also the fastest compared to larvae densities that existed above this range. Increased larval densities also affected how many eggs were produced among females that survived within the original experimental population. When densities were higher, less eggs were produced by these surviving females.

Magnified image of the tail end and the head of C. pipiens during the larval stage of development. Common house mosquito (247 26A) Total preparation; larva.jpg
Magnified image of the tail end and the head of C. pipiens during the larval stage of development.

Swarming patterns

Swarming is not essential to mating for C. pipiens, as lab experiments have demonstrated that successful mating can occur in laboratory settings, [20] where swarming patterns are unattainable. C. pipiens mating can occur as a female is resting. However, there has been evidence found linked to how swarming patterns do operate, when present in certain populations. The position of the sun has an effect on swarming patterns. Light patterns associated with both sunset and sunrise can cause swarming to develop. [6] Swarms develop usually to a distinct marker, which C. pipiens use as a common metric to denote where swarming should occur. Within these swarm formations, C. pipiens have been observed to move around in elliptical loop patterns. [6]

Autogeny

Autogeny is the ability to lay eggs without prior consumption of blood. This trait varies across the C. pipiens complex, and could limit transmission of pathogens since females do not risk food contamination in order to lay eggs. [2]

An image of C. pipiens larvae occupying a water-submerged environment. They come closer to the water's surface as the larval development period comes closer to an end. By (Image: James Gathany, CDC) - A New Model for Predicting Outbreaks of West Nile Virus. Gross L, PLoS Biology Vol. 4/4/2006, e101. https://dx.doi.org/10.1371/journal.pbio.0040101. See also: Kilpatrick AM, Kramer LD, Jones MJ, Marra PP, Daszak P (2006) West Nile Virus Epidemics in North America Are Driven by Shifts in Mosquito Feeding Behavior. PLoS Biol 4(4): e82 doi:10.1371/journal.pbio.0040082, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1441809 Culex sp larvae.png
An image of C. pipiens larvae occupying a water-submerged environment. They come closer to the water's surface as the larval development period comes closer to an end. By (Image: James Gathany, CDC) – A New Model for Predicting Outbreaks of West Nile Virus. Gross L, PLoS Biology Vol. 4/4/2006, e101. https://dx.doi.org/10.1371/journal.pbio.0040101. See also: Kilpatrick AM, Kramer LD, Jones MJ, Marra PP, Daszak P (2006) West Nile Virus Epidemics in North America Are Driven by Shifts in Mosquito Feeding Behavior. PLoS Biol 4(4): e82 doi:10.1371/journal.pbio.0040082, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1441809

Disease vectors

Mosquito-borne diseases are widespread throughout the globe. According to the World Health Organization, these diseases affected nearly 350 million people worldwide in 2017. [21] Culex pipiens is one of the many members of the mosquito family that is a carrier of disease. Specifically, C. pipiens are well known carriers of West Nile virus, Saint Louis encephalitis viruses, avian malaria ( Plasmodium relictum ), [22] and filarial worms.

Culex pipiens is not a vector of P. homocircumflexum , a parasite of unknown vector which is only known to be unable to get beyond the oocyst stage in this and several other mosquitoes. [22]

Mosquito bites

Mosquito bites can affect warm, uncovered areas of the body, and reactions to the bites vary in severity. [6] Once a host is bitten by a mosquito, the mosquito uses its proboscis to take in blood. In the process of digesting blood, mosquitoes inject saliva instantly after the proboscis enters the host. [6] Many humans display an allergic reaction to the saliva.

Arbovirus diseases

Arboviruses are diseases that are transmitted to vertebrates by arthropods, including insects. Culex pipiens carries many arbovirus diseases across many regions of the globe. Cases of Rift Valley fever have been present in Africa, Japan encephalitis has been prevalent in East Asian countries, and West Nile virus has been seen all over the globe. [6]

Global impact

In February 2019, a theoretical modelling study was reported regarding the potential role of C. pipiens in transmitting West Nile Virus in the UK. Empirical data were taken from a study conducted during 2015 in Southern England in order to obtain a better understanding of the seasonal abundance patterns, [21] thereby helping to identify the season(s) when the species thrives best and is the most populous.

See also

Related Research Articles

<span class="mw-page-title-main">Mosquito</span> Family of flies

Mosquitoes, the Culicidae, are a family of small flies consisting of 3,600 species. The word mosquito is Spanish and Portuguese for little fly. Mosquitoes have a slender segmented body, one pair of wings, three pairs of long hair-like legs, and specialized, highly elongated, piercing-sucking mouthparts. All mosquitoes drink nectar from flowers; females of some species have in addition adapted to drink blood. Evolutionary biologists view mosquitoes as micropredators, small animals that parasitise larger ones by drinking their blood without immediately killing them. Medical parasitologists view mosquitoes instead as vectors of disease, carrying protozoan parasites or bacterial or viral pathogens from one host to another.

<i>Aedes albopictus</i> Species of mosquito

Aedes albopictus, from the mosquito (Culicidae) family, also known as the (Asian) tiger mosquito or forest mosquito, is a mosquito native to the tropical and subtropical areas of Southeast Asia. In the past few centuries, however, this species has spread to many countries through the transport of goods and international travel. It is characterized by the white bands on its legs and body.

<i>Anopheles</i> Genus of mosquito

Anopheles is a genus of mosquito first described by J. W. Meigen in 1818, and are known as nail mosquitoes and marsh mosquitoes. Many such mosquitoes are vectors of the parasite Plasmodium, a genus of protozoans that cause malaria in birds, reptiles, and mammals, including people. The Anopheles gambiae mosquito is the best-known species of marsh mosquito that transmits the Plasmodium falciparum, which is a malarial parasite deadly to human beings; no other mosquito genus is a vector of human malaria.

<span class="mw-page-title-main">Black fly</span> Family of insects

A black fly or blackfly is any member of the family Simuliidae of the Culicomorpha infraorder. It is related to the Ceratopogonidae, Chironomidae, and Thaumaleidae. Over 2,200 species of black flies have been formally named, of which 15 are extinct. They are divided into two subfamilies: Parasimuliinae contains only one genus and four species; Simuliinae contains all the rest. Over 1,800 of the species belong to the genus Simulium.

<i>Culex</i> Genus of mosquitoes

Culex or typical mosquitoes are a genus of mosquitoes, several species of which serve as vectors of one or more important diseases of birds, humans, and other animals. The diseases they vector include arbovirus infections such as West Nile virus, Japanese encephalitis, or St. Louis encephalitis, but also filariasis and avian malaria. They occur worldwide except for the extreme northern parts of the temperate zone, and are the most common form of mosquito encountered in some major U.S. cities, such as Los Angeles.

<span class="mw-page-title-main">Culicinae</span> Subfamily of flies

The Culicinae are the most extensive subfamily of mosquitoes (Culicidae) and have species in every continent except Antarctica, but are highly concentrated in tropical areas. Mosquitoes are best known as parasites to many vertebrate animals and vectors for disease. They are holometabolous insects, and most species lay their eggs in stagnant water, to benefit their aquatic larval stage.

<i>Culex tritaeniorhynchus</i> Species of fly

Culex (Culex) tritaeniorhynchus is a species of mosquito and is the main vector of the disease Japanese encephalitis. This mosquito is a native of northern Asia, and parts of Africa. Females target large animals for blood extraction, including cattle and swine, and are strongly anthropophilic.

<span class="mw-page-title-main">London Underground mosquito</span> Species of fly

The London Underground mosquito is a form of mosquito in the genus Culex. It is found in the London Underground railway system as its name suggests, but has a worldwide distribution and long predates the existence of the London Underground. It was first described as a distinct species from Egyptian specimens by the biologist Peter Forsskål (1732–1763). He named this mosquito Culex molestus due to its voracious biting, but later biologists renamed it Culex pipiens f. molestus because there were no morphological differences between it and Culex pipiens. Notably, this mosquito assaulted Londoners sleeping in the Underground during the Blitz, although similar populations were long known.

<i>Culex restuans</i> Species of fly

Culex restuans is a species of mosquito known to occur in Canada, the United States, Mexico, Guatemala, Honduras, and the Bahamas. It is a disease vector for St. Louis encephalitis and West Nile virus. In 2013 West Nile Virus positive specimens were collected in Southern California.

<i>Aedes triseriatus</i> Species of mosquito

Aedes triseriatus is a member of the true fly order. It is called the eastern tree hole mosquito due to its predilection towards breeding in stagnant water that is found in natural holding containers such as tree holes. It is native to the eastern United States and southern Canada and favors hardwood habitats. It has been found as far south as the Florida Keys, as far west as Idaho and Utah, and as far north as Quebec and Ontario. This species has not yet been found in Europe, but it has the potential to spread through international trade. In 2004, it was found in a shipment of tires travelling from Louisiana to France, but it was identified and targeted with insecticides that truncated its spread. It is a known vector of La Crosse encephalitis and canine heartworm disease. In the laboratory, it has been found to vector several other viruses including yellow fever, eastern encephalitis, Venezuelan encephalitis, and western encephalitis. Because of its potential for international spread and its proclivity for transmitting disease, monitoring the distribution of this species is essential.

<i>Culex quinquefasciatus</i> Species of fly

Culex quinquefasciatus, commonly known as the southern house mosquito, is a medium-sized mosquito found in tropical and subtropical regions of the world. It is a vector of Wuchereria bancrofti, avian malaria, and arboviruses including St. Louis encephalitis virus, Western equine encephalitis virus, Zika virus and West Nile virus. It is taxonomically regarded as a member of the Culex pipiens species complex. Its genome was sequenced in 2010, and was shown to have 18,883 protein-coding genes.

<i>Anopheles albimanus</i> Species of mosquito

Anopheles albimanus is a species of mosquito in the order Diptera. It is found in coastal Central and South America, the Caribbean, and Mexico. It is a generalist species and capable of wide dispersion. A. albimanus is a common malaria vector.

Culex modestus is a species of blood-feeding mosquito of the family Culicidae. It has been experimentally demonstrated to be capable of transmitting West Nile virus (WNV), and its habit of feeding aggressively on both birds and humans gives it significant potential for transmission of zoonotic infections from birds to humans. It is believed to be the principle bridge vector of WNV between birds and humans in southern France and is thought to have played a role in WNV transmission in the Danube delta, Caspian and Azov sea deltas, and the Volga region in Russia. It has also been implicated in Tahyna virus and Lednice virus transmission in France and Slovakia, respectively.

Diptera is an order of winged insects commonly known as flies. Diptera, which are one of the most successful groups of organisms on Earth, are very diverse biologically. None are truly marine but they occupy virtually every terrestrial niche. Many have co-evolved in association with plants and animals. The Diptera are a very significant group in the decomposition and degeneration of plant and animal matter, are instrumental in the breakdown and release of nutrients back into the soil, and whose larvae supplement the diet of higher agrarian organisms. They are also an important component in food chains.

<i>Anopheles claviger</i> Species of mosquito

Anopheles claviger is a mosquito species found in Palearctic realm covering Europe, North Africa, northern Arabian Peninsula, and northern Asia. It is responsible for transmitting malaria in some of these regions. The mosquito is made up of a species complex consisting of An. claviger sensu stricto and An. petragnani Del Vecchio. An. petragnani is found only in western Mediterranean region, and is reported to bite only animals; hence, it is not involved in human malaria.

<i>Anopheles freeborni</i> Species of Mosquito

Anopheles freeborni, commonly known as the western malaria mosquito, is a species of mosquito in the family Culicidae. It is typically found in the western United States and Canada. Adults are brown to black, with yellow-brown hairs and gray-brown stripes on the thorax. Their scaly wings have four dark spots, which are less distinct in the male.

<i>Toxorhynchites rutilus</i> Species of fly

Toxorhynchites rutilus, also known as the elephant mosquito or treehole predatory mosquito, is a species of mosquito in the family Culicidae. Unlike most species in the genus that populate the tropics, Tx. rutilus is endemic to temperate regions. As their name suggests, these mosquitoes commonly lay their eggs in treeholes where their larvae are predators on a variety of arthropods. As with other mosquitoes, they also inhabit other bodies of stagnant water such as in a tire or artificial containers. but not large bodies of water like ponds and ground pools. Females are able to strategically locate breeding sites that already contain prey to oviposit in.

<i>Aedes taeniorhynchus</i> Species of fly

Aedes taeniorhynchus, or the black salt marsh mosquito, is a mosquito in the family Culicidae. It is a carrier for encephalitic viruses including Venezuelan equine encephalitis and can transmit Dirofilaria immitis. It resides in the Americas and is known to bite mammals, reptiles, and birds. Like other mosquitoes, Ae. taeniorhynchus adults survive on a combination diet of blood and sugar, with females generally requiring a blood meal before laying eggs.

Chironomus annularius is a species of non-biting midge in the family Chironomidae. It is usually found in regions with bodies of fresh water but can be found in almost every environment. It tends to form "hotspots" around specific areas. The species is distinguished by the size of its chromosomes and the lack of a proboscis.

<i>Tokunagayusurika akamusi</i> Species of fly

Tokunagayusurika akamusi is a midge fly species of the family Chironomidae, commonly called "nonbiting midges" or "lake flies."

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