How a tiny fly uses a shimmering bubble to survive extreme alkaline waters
In California’s Mono Lake, the water is three times saltier than the ocean and highly alkaline. For most, these conditions are lethal, but the alkali fly has mastered a way to scuba dive into this harsh environment while remaining completely dry.
The alkali fly thrives in an environment that would be toxic to most life. Mono Lake is characterized by a high concentration of sodium carbonate and a pH level ranging between 9 and 12. To navigate these caustic waters, the fly employs a sophisticated dual-layer defense: a coating of water-repellent wax and a dense layer of hair. This hair traps air, creating a protective, shimmering bubble shield that allows the insect to dive for algae and lay eggs without ever getting wet.
This specialized biology is part of a delicate ecosystem. Alongside algae, nematodes, and brine shrimp, the alkali fly is one of the few species capable of surviving the lake's intense salinity and alkalinity. The lake itself is a landscape of otherworldly limestone towers known as tufas, which form over decades or centuries through the chemical reaction of calcium freshwater springs and carbonate-rich lake water.
The survival of this species is deeply intertwined with human history and modern environmental challenges. The Kutzadika’a Paiute, the native people of the Mono Basin, have lived in the area for thousands of years and traditionally harvest kutsavi—the fly's pupae—as food. However, the lake's stability is currently threatened. Since 1941, the Los Angeles Department of Water & Power has been diverting water from Mono Lake’s streams to meet urban demands, a process driven by reduced rainfall and runoff from the Sierra Nevada.
Source: This Daring Fly Swims in a Shimmering Bubble Shield | Deep Look
