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Gnats

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Canyonlands National Park Service U.S. Department of the Interior Canyonlands National Park Gnats In the late spring and early summer, swarms of tiny biting gnats often greet visitors to Arches and Canyonlands National Parks. Also called midges, no-see-ums, punkies and moose flies, these miniscule pests thrive in the scattered pinyon-juniper forests of southeast Utah. Regardless of their name, it is no secret that a large population of these creatures can make outdoor activity unbearable. Natural History Biting gnats are parasitic organisms similar to mosquitoes and are capable of very annoying bites. However, while mosquitoes pierce the skin and feed with mouthparts similar to a hypodermic needle, biting gnats have scissor-like mandibles that cut the skin to produce a small, bleeding wound. In the process of biting, saliva penetrates the skin causing an allergic reaction. This reaction is minor in most people, though it can be severe in rare cases. Only females bite as they require a blood meal to produce eggs (males feed on plants). Gnats are active mostly during the day, especially around mid-morning and dusk. Biting usually peaks during a three week period in late spring or early summer, and is usually more severe following droughts. Evidence of a bite may include itching, discomfort and localized swelling. Anti-itch creams may alleviate discomfort. Visitors can lessen their chances of being bitten by wearing protective clothing (long sleeves/ pants), and repellants containing citronella may also be effective. The life cycle of all biting gnats begins as an egg laid by the female shortly after mating. Males attempting to mate are especially harried as their sexual potency begins to decline eight EXPERIENCE YOUR AMERICA hours after they pupate. A young male gnat takes about ten minutes to fertilize a willing female. However, as males reach 24 to 36 hours in age, copulation can take almost an hour. Females are intolerant of the advances of older males, and will resist sex with impotent males by flying away, kicking violently, and tipping their abdomens away. Gnats deposit eggs in places that may become moist or flooded with spring rains. In canyon country, this includes mosses, soils, potholes and the bark of Utah junipers and pinyon pines. Both eggs and larvae of some gnat species are tolerant of desiccation, becoming inactive when their habitat dries and starting their metabolic machinery again when rain moistens their home. Although the larvae will pupate whenever they reach the appropriate stage if there is adequate water available, they may spend most of the summer, fall and winter in their egg and/or larval stages. Adults often emerge from the pupal case after late spring or early summer rains. Annoying as they are, biting gnats are an essential part of the web of life in canyon country. Many animals, including birds, fish, lizards and other insects, depend on gnats as a food source.

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