The word mosquito (formed by mosca and diminutive -ito) 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. Mosquitoes, the Culicidae, are a family of small flies consisting of 3,600 species. All mosquitoes drink nectar from flowers; females of some species have in addition adapted to drink blood. The group diversified during the Cretaceous period. 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. The mosquito life cycle consists of four stages: egg, larva, pupa, and adult. Mosquitoes seem pointless and purely irritating to humans, but they play an important role in the ecosystem. Infact, without mosquitoes, many animals could decline due to a lack of food. Fish populations could be impacted, as many fish species rely on mosquito larvae as a food source. Bats rely largely on mosquitoes for food may also decline or even go extinct if mosquitoes extinct. In brief, mosquitoes form an important source of biomass in the food chain—serving as food for fish as larvae and for birds, bats and frogs as adult flies—and some species are important pollinators. Mosquitoes are not just annoying summer pests with some benefits, but are also responsible for spreading malaria, a disease that kills over half a million people annually. The secret life of mosquitoes is both bizarre and ecologically important. Their functions in the ecosystem are overlooked. Indiscriminate mass elimination of mosquitoes would impact everything from pollination to biomass transfer to food webs.
Worldwide there are about 3,500 mosquito species, many of which want nothing to do with biting humans or any other animal. Even in species that bite, it is only the females that do so and just to develop their eggs. The fundamental food of all adult mosquitoes is plant sugar and its associated nutrients, most often in the form of floral nectar. In the process of looking for nectar, mosquitoes pollinate many of the flowers they visit — this is one of the most commonly overlooked ecological functions of mosquitoes. Mosquito pollination is likely far more common than we realise. There is evidence that mosquitoes function as generalist pollinators in some plant families, and there are many known instances of mosquito pollination that are simply overlooked. Mosquito pollination was observed as far back as the 19th century. Mosquito pollination is hard to see, as most mosquitoes visit flowers near or after dusk and human presence disturbs mosquitoes from nearby flowers. In the Arctic, plants make use of vast hordes of nectar-hungry mosquitoes for pollination during the short growing season. We generally share that Malaria infects some 249 million people worldwide each year, and kills around 608,000 people, maximum childrens under the age of 5 years.
Mosquitoes cause a huge further medical and financial burden by spreading yellow fever, dengue fever, Japanese encephalitis, Rift Valley fever, Chikungunya virus and West Nile virus. They live on almost every continent and habitat, and serve important functions in numerous ecosystems. “Mosquitoes have been on Earth for more than 100 million years,” says scientists, “and they have co-evolved with so many species along the way.” The connection between mosquitoes and flowers is ancient and has likely had a strong influence on mosquito evolution. Genetic evidence supports a rapid increase in mosquito diversity corresponding with the appearance of flowering plants. Mosquito scales have been found in flower fossils from the mid-Cretaceous era. Mosquitoes locate flowers by a variety of cues including odour and vision, and recent research has discovered that some of the odour constituents of certain flowers that mosquitoes feed on (and pollinate) are shared with humans. One interpretation of this is that to mosquitoes, some flowers may smell like humans, possibly indicating the evolutionary origins of why some mosquitoes take blood. While less ecologically important than pollination, mosquitoes also consume plant sugar that has been processed by other insects. Plant-sucking insects such as aphids excrete a sugary waste product known as honeydew, which is exploited as a food source by many insects, including mosquitoes. But honeydew is hard to find in the environment. Mosquitoes have solved this problem by using the smells emitted by microbes that live in the honeydew to locate it. When a mosquito inserts its mouthparts into an ant’s mouth and strokes the ant’s head with its antennae, it tricks the ant into regurgitating and sharing its honeydew. Additionally, honeydew is famously consumed by many ants, which farm aphids to collect honeydew.
An ant can, through strokes of its antennae, induce a compatriot that has recently eaten honeydew to regurgitate and share some of its meal. Some mosquito species have learned to exploit this for their own benefit. The Mosquito serves as Biomass transfers.Mosquito larvae grow by consuming microorganisms such as algae and microbes that decompose decaying plant material. Larval mosquitoes contribute to aquatic food chains by serving as food sources for many predators, including fish and birds.The Mosquito serves as Biomass transfers. Mosquito larvae grow by consuming microorganisms such as algae and microbes that decompose decaying plant material. Larval mosquitoes contribute to aquatic food chains by serving as food sources for many predators, including fish and birds. If a mosquito survives to adulthood, it flies away from its aquatic habitat. This transfers the mosquito’s biomass (its material weight) to the terrestrial ecosystem. Adult mosquitoes are eaten by many creatures including birds, bats, frogs and other insects. Adult mosquitoes that die (or are eaten and excreted) then decompose, turning the microbes they consumed as larvae into nutrients for plants, completing another important ecological function.
Wiping out a species of mosquito could leave a predator without prey, or a plant without a pollinator. And exploring a world without mosquitoes is more than an exercise in imagination: intense efforts are under way to develop methods that might rid the world of the most pernicious, disease-carrying species (see ‘War against the winged’). Scientists reported that Mosquitoes are delectable things to eat and they’re easy to catch. In the absence of their larvae, hundreds of species of fish would have to change their diet to survive. This may sound simple, but traits such as feeding behaviour are deeply imprinted, genetically, in those fish. The mosquito fish (Gambusia affinis), for example, is a specialized predator — so effective at killing mosquitoes that it is stocked in rice fields and swimming pools as pest control — that could go extinct. And the loss of these or other fish could have major effects up and down the food chain. Many species of insect, spider, salamander, lizard and frog would also lose a primary food source. It has been reported that birds produced on average two chicks per nest after spraying, compared with three for birds at control sites.
“Mosquitoes remain a major global health threat, especially in tropical and subtropical regions. World Mosquito Day highlights their continued impact on millions of lives. The day reminds us of past scientific achievements but also encourages a renewed commitment to prevention, research, and education. Mosquitoes cause diseases like malaria, dengue, yellow fever, and West Nile virus, so their control is vital for global health security.”
Most mosquito-eating birds would probably switch to other insects that, post-mosquitoes, might emerge in large numbers to take their place. Other insectivores might not miss them at all: bats feed mostly on moths, and less than 2% of their gut content is mosquitoes. As larvae, mosquitoes make up substantial biomass in aquatic ecosystems globally and they abound in bodies of water ranging from ephemeral ponds to tree holes. They feed on decaying leaves, organic detritus and microorganisms. Species of mosquito (Wyeomyia smithii) and midge (Metriocnemus knabi) are the only insects that live there, along with microorganisms such as rotifers, bacteria and protozoa. When other insects drown in the water, the midges chew up their carcasses and the mosquito larvae feed on the waste products, making nutrients such as nitrogen available for the plant. In this case, eliminating mosquitoes might affect plant growth. Mosquito larvae can be found in most types of freshwater, from temporary snow-melt pools to lakes. They can even be found in a few types of saltwater habitats such as crab burrows.One of the more interesting habitats that mosquito larvae can be found in are the pitchers the carnivorous plant Sarracenia purpurea. These pitchers are filled with water and decomposing insects that provide food to both the plant and the mosquito. The digestive enzymes in this plant are too weak to dissolve the mosquito larvae. Several mosquito species place their eggs in the water that collects between the leaves of tropical plants in the Brazilian Atlantic forest, and the larvae of some other mosquitoes attach themselves to the roots of aquatic plants to breathe.In 1974, ecologist John Addicott, proposed that as the larvae feed, they keep down the numbers of the dominant species of protozoa, letting others persist. The broader consequences for the plant are not known.
A stronger argument for keeping mosquitoes might be found if they provide ‘ecosystem services’ — the benefits that humans derive from nature. Evolutionary ecologist Dina Fonseca, says people being bitten by no-see-ums or being infected through them with viruses, protozoa and filarial worms would love to eradicate them,” But without mosquitoes, thousands of plant species would lose a group of pollinators. Humans have made many concerted, if not always effective, efforts to eliminate mosquitoes. The more successful attempts include the eradication campaign against Aedes aegypti in the early 1900s, which relieved yellow fever enough to allow the completion of the panama canal; and the use of the larvicide paris green to rid Brazil of the malaria vector Anopheles gambiae by 1940. Application of the adulticide ddtallowed the united states to be declared free of malaria in 1949. But the chemicals sprayed then are banned in many countries now. “we can’t mount those top-down, military-style efforts today,”. “And we don’t have ddt any more. Mosquito control using less-toxic chemicals is key to keeping the insects in florida and parts of southeast Asia and latin America at tolerable levels. It’s a complicated business, and that’s why we still have mosquitoes. Scientists are working to reduce diseases caused by mosquito and balance ecosystem. Mosquitoes are also the world’s deadliest animal and cause immense suffering. Ideally, we should maintain the ecosystem functions of mosquitoes while also reducing disease burden.
Not all mosquito species are responsible for spreading pathogens. Targeting specific species or making the mosquitoes themselves immune to pathogens and thus unable to spread them would protect humans while keeping the ecosystem function of mosquitoes intact. In a world of collapsing ecosystems and declining pollinator populations we need all of the help we can get. This includes acknowledging the secret lives of mosquitoes and more sophisticated mosquito control strategies that protects their ecosystem functions. The World Mosquito Day is celebrated on August 20th every year marking the occasion when Sir Ronald Ross discovered that female mosquitoes transmit malaria between humans. The malarial parasite was found in the gastrointestinal tract of a female mosquito. The discovery allowed scientist to better understand the role of mosquitoes in the disease. It also provided a starting point for prevention. In 1902. Ross became the first British person to be awarded the Nobel Prize for Medicine.There are over three thousand species of mosquitoes in the world today. Of those, only about three cause serious diseases. The most prevalent diseases are malaria, dengue fever, West Nile, Yellow fever, Zika virus and Encephalitis. The London School of Hygiene & Tropical Medicine holds Mosquito Day celebrations every year, including events such as parties and exhibitions, a tradition dating back to as early as the 1930s.According to the latest World malaria report, there were more than 263 million cases of malariaworldwide. According to the WHO, “Malaria is a life-threatening disease caused by parasites that are transmitted to people through the bites of infected female Anopheles mosquitoes.” Importantly, it is preventable as well as curable. In 1897, a British medical doctor named Ronald Ross discovered that the female Anopheles mosquitoes are responsible for spreading malaria. Ross was born in the Almora district of India’s Uttarakhand. He studied in London and came back to India to work on malaria from 1882 to 1889. He found the link between mosquitoes and malaria transmission 15 years into his studies, and was awarded the medicine Nobel Prize in 1902 for describing the complete life cycle of the malarial parasite.
World Mosquito Day is observed annually on 20 August to commemorate Sir Ronald Ross. This Day helps in raising awareness about the ongoing threat of malaria and other diseases transmitted by one of the world’s deadliest killers – the mosquito. It has become more urgent to understand the interactions between climate, mosquitoes, and the pathogens mosquitoes transmit to humans. The theme for World Mosquito Day 2025 is: “Accelerating the Fight Against Malaria for a More Equitable World.” This theme emphasises ensuring equitable access to malaria prevention, diagnosis, and treatment, especially in vulnerable, resource-limited communities. It underscores the urgency of scaling interventions like bed nets, rapid tests, indoor spraying, and ensuring access to promising vaccines. By focusing on innovation, the 2025 theme encourages the development of improved vaccines, better mosquito control methods, and enhanced public awareness to reduce the burden of diseases spread by mosquitoes. The importance of World Mosquito Day extends beyond honouring past scientific achievements. It serves as a reminder that mosquito-borne diseases remain a major global health threat, especially in tropical and subtropical regions. In 2025, this day highlights the continuing impact of mosquitoes on millions of lives. It encourages governments, health organisations, and individuals to renew their commitment to prevention, research, and education. Given that mosquitoes cause diseases like malaria, dengue, yellow fever, chikungunya, Zika virus, encephalitis, and West Nile virus, their control is vital for global health security. We can celebrate World Mosquito Day by organizing workshops or webinars about mosquito-borne diseases and prevention methods; conduct local clean-up drives and launch social media campaigns to raise awareness among people.
(The author is Professor & Head ,Agri. Econ & Statistics, FOA at S K University Of Agriculture Sciences & Technology Kashmir SKUAST-K, Srinagar, J&K. The views, opinions and conclusions expressed in this article are those of the author and aren’t necessarily in accord with the views of “Kashmir Horizon”)
Dr. Bilal A Bhat
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