Culex pipiens

Linnaeus, 1758

common house mosquito, northern house mosquito

Culex pipiens is a globally distributed mosquito to Africa, Asia, and Europe, now found in temperate regions worldwide except Antarctica. It is the species for the Culex and one of the most common mosquitoes in human in the northern hemisphere. The species includes two morphologically indistinguishable but ecologically distinct forms: C. p. form pipiens, which lives above ground and feeds primarily on birds, and C. p. form molestus, which lives underground and bites mammals including humans. Hybrids between these forms exhibit intermediate feeding and are implicated as bridge for West Nile virus transmission from birds to humans.

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Pronunciation

How to pronounce Culex pipiens: //ˈkjuːlɛks ˈpɪpiɛnz//

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Habitat

Culex pipiens thrives in urban and suburban environments with standing water containing matter. Natural larval include marshes, pools, streams, and shallow ponds. Artificial habitats include barrels, sewage ditches, gutters, cesspits, and intermittent puddles. Form pipiens occupies above-ground habitats with open water sources. Form molestus exploits subterranean habitats including basements, sewers, underground subway tunnels, and buried water holding tanks, allowing year-round activity buffered from seasonal temperature changes.

Distribution

to Africa, Asia, and Europe. Now widely distributed in temperate regions on every continent except Antarctica. Abundant in cities, particularly those with poor wastewater management. Most common mosquito in northern regions of the United States.

Seasonality

Activity varies by region and climate. Breeding typically begins when temperatures reach 10°C (50°F). Form pipiens females enter reproductive during winter, in sheltered locations such as basements, sheds, and caves in a state of -seeking arrest. Form molestus remains active year-round due to underground buffered from seasonal cold. Artificial light at night can disrupt diapause, causing females to become reproductively active during autumn and winter.

Diet

Females feed on vertebrate blood including birds, humans, and cattle as a source for production. Form pipiens preferentially feeds on birds, particularly associated with human habitation such as doves and pigeons. Form molestus frequently bites mammals including humans. Males feed exclusively on sugar sources including nectar, floral nectar, and . Females also consume sugar sources, with increased nectar feeding before winter to store fat. Peak feeding activity occurs during early evening hours.

Life Cycle

Females lay in rafts of 150 or more eggs that float on water surfaces. develop in water over 7–10 days, feeding on particles and bacteria. remain at the water surface for 1–3 days before . Total development from larva to adult takes 20–25 days under optimal conditions. Form pipiens requires a blood meal before laying eggs (anautogeny). Form molestus can lay one initial batch of eggs without blood feeding (autogeny) due to larval-derived reserves, but requires blood for subsequent egg batches.

Behavior

Females locate using visual and chemical cues including carbon dioxide and lactic acid. Feeding involves activation, orientation, landing, and probing stages. Mating occurs in swarms or while females are resting; swarming is not essential for successful copulation. Form pipiens mates in open spaces. Form molestus mates in confined underground spaces. Females may perform rejection kicks to deter courting males, though males can still achieve copulation afterward. Males use antennal fibrillae to locate females; females use them to locate hosts.

Ecological Role

Major of West Nile virus, Saint Louis virus, (Plasmodium relictum), and filarial . Form pipiens maintains transmission cycles among bird . Form molestus transmits to mammals. Hybrids between forms serve as bridge vectors connecting bird and mammal transmission cycles. filter particles from water, contributing to in aquatic . pollinate Silene otites, tansy (Tanacetum vulgare), and Achillea millefolium when feeding on nectar.

Human Relevance

Significant public health concern as a of West Nile virus, which has caused over 2,600 deaths in the United States since 1999. Bites cause allergic reactions in many people. Abundant in urban areas with poor wastewater management. Control efforts on eliminating standing water breeding sites and applying such as israelensis and diflubenzuron. Light pollution may extend biting seasons and increase risk by disrupting .