Fireflies Disappearing One by One, IPB Expert Reveals Ominous Signs

The firefly, an insect synonymous with beautiful night-time light, is becoming increasingly rare and difficult to find in the wild. This phenomenon, which has recently drawn many complaints from netizens on social media, is a serious alarm regarding the worsening quality of the environment in Indonesia.

Kesumawati Hadi, a lecturer and entomology researcher from the School of Veterinary Medicine and Biomedical Sciences at IPB University, emphasised that the presence of fireflies is not merely an aesthetic sight, but a parameter of ecosystem health. “Fireflies are bioindicators, meaning organisms whose presence or absence can reflect the health of an ecosystem. When environmental quality deteriorates, their population will quickly shrink or even disappear,” she stated.

The threat of extinction for these light-bearing insects is not only occurring in Indonesia but has become a global crisis. Data from the International Union for Conservation of Nature (IUCN) records that around 11% to 20% of the world’s firefly species are currently threatened with extinction. Specifically, several species inhabiting mangrove areas in Indonesia, Malaysia, and Thailand have officially been classified as vulnerable. The primary cause is massive land conversion, with green areas, swamps, and rice fields being cleared for residential and industrial development, dramatically destroying their natural habitats.

Beyond deforestation and land conversion, an invisible enemy for fireflies is light pollution from overly bright LED lights. Artificial light from urban areas disrupts their navigation and reproduction processes. Male fireflies struggle to detect the light signals emitted by females, leading to a sharp increase in mating failure. The loss of firefly populations is further exacerbated by the use of chemical insecticides and pesticides in agriculture, climate change triggering extreme droughts, the cementing of irrigation channels which destroys egg-laying sites, and the massive pace of urbanisation altering natural landscapes.

Currently, fireflies can only survive in areas where the natural environment is strictly preserved, such as mangrove forests, natural riverbanks, traditional rice fields, organic plantations, and humid tropical forest floors far from the reach of city lights. If environmental destruction and light pollution continue unchecked, it is feared that future generations will only be able to witness the beautiful phenomenon of firefly light through textbooks, museums, or video recordings. The public is urged to take simple steps, such as leaving open soil areas in home gardens instead of paving them over entirely, dimming overly bright outdoor lights, and switching to organic fertilisers to help preserve micro-habitats.