Outdoor seating in urban areas can significantly alter the life cycle of caddisflies, small aquatic insects vital to freshwater ecosystems. These insects rely on clean, undisturbed water bodies for their larval development, but the presence of outdoor seating near rivers or ponds often leads to increased human activity, pollution, and habitat disruption.

Caddisflies lay their eggs in water, and larvae build protective cases from organic debris. However, outdoor seating areas may introduce litter, chemicals, and physical disturbances that degrade water quality. This can reduce egg survival rates and limit larval access to essential materials for case-building.

Additionally, artificial lighting from cafes or restaurants near water bodies can disrupt adult caddisfly mating behaviors, as they are often nocturnal. Changes in temperature and shading from seating structures may also affect larval growth rates.

To mitigate these effects, urban planners should consider eco-friendly seating designs, buffer zones near water, and reduced nighttime lighting. Protecting urban caddisfly populations helps maintain biodiversity and water quality in cities.