In the Odesa region, billions of non-biting chironomid midges have been recorded in the Tuzlivski Lymany National Nature Park, according to a report by Ivan Rusev, Doctor of Biological Sciences and head of the park’s research department. This breathtaking natural phenomenon contrasts sharply with recent global alarms regarding insect-borne illnesses. For instance, the Kyiv City State Administration recently confirmed the hospitalization of 17 people with West Nile fever in the capital, resulting in three tragic deaths. Meanwhile, the United States Centers for Disease Control and Prevention (CDC) has reported a fatal outbreak of a rare mosquito-borne disease, Eastern Equine Encephalitis (EEE). However, researchers emphasize that the massive swarms currently inhabiting southern Ukraine pose absolutely no threat to humans.
According to Rusev, the reproduction of these midges has skyrocketed over the vast, shallow, and moist areas of the Tuzlivski Lymany. “These are millions and millions of chironomid midges, numbering in the billions across the national park. They are among the most abundant insects here,” the researcher noted. The insects typically emerge in the evening, particularly in windless weather. Strong winds prevent them from gathering into massive clouds, which can sometimes reach up to 50 meters in height, giving the illusion that there are fewer insects on breezy days.
In reality, their massive numbers are independent of wind presence or direction. Rusev reassures the public that there is no reason to fear these tiny creatures with fluffy antennae. Unlike their blood-sucking mosquito “relatives,” midges are completely peaceful and cannot bite. They only feed during their larval stage—consuming detritus and aquatic microorganisms. Adult midges do not feed at all; their mouthparts are underdeveloped. Therefore, discussions about bites or disease transmission from these swarms are entirely unfounded. The changing weather conditions, which sometimes lead to phenomena like storm warnings in Ukraine: strong winds, thunderstorms, and power outages, only further stimulate the natural lifecycle of these aquatic ecosystems by increasing the shallow water areas necessary for larvae.
“While the adult midges might not be widely famous, their larvae are world-renowned,” Rusev emphasized. “It is rare in the natural world for a larva to be more famous than its winged parent.” The red, worm-like larvae of the chironomid midge, widely known as bloodworms, thrive in bottom silt. They serve as a colossal and essential food source for fish and various wetland birds, including the exotic pink flamingos that visit the park. Despite the ongoing regional challenges, such as the recent massive Russian strike on the Odesa region that damaged the port, a civilian vessel, and infrastructure, the local wildlife continues to flourish and maintain the ecological balance.
Chironomidae, also known as non-biting midges or lake flies, are a family of nematoceran flies. Many species superficially resemble mosquitoes but lack the wing scales and elongated mouthparts of the biting Culicidae. They earned their Ukrainian name “dzvintsi” (ringers) because of the distinctive high-pitched humming sound produced by their rapid wingbeats, which can reach up to 1,000 beats per second. So, while health authorities tackle severe mosquito-borne outbreaks globally, the midges of Tuzlivski Lymany stand simply as a marvel of biodiversity, vital to the health of the local food chain.