Nocturnal pollinators, such as moths, rely heavily on scent to find food in the dark. Flowers release specific chemical compounds called volatiles to create a scent trail that leads insects to them. Artificial light at night, or ALAN, interferes with this delicate process in several ways.
First, light pollution can change how plants behave. When it stays bright at night, some plants may alter the timing or intensity of the scents they release. This makes it harder for pollinators to track them effectively. Second, light can actually change the chemistry of the scent itself. The presence of light can affect the degradation rate of these floral chemicals, meaning the scent trail may vanish or become distorted before the insect can follow it.
Furthermore, light pollution confuses the pollinators themselves. It can distract them or disrupt their natural navigation instincts. Instead of following a scent to a flower, they might become preoccupied with searching for the light source. This breakdown in communication between the plant and the insect can lead to lower pollination rates, which ultimately impacts plant reproduction and the health of our entire ecosystem.
