Researchers estimate that artificial lighting is increasing at a rate of 6% each year around the world. This could dramatically reduce the amount of “naturally unlit habitat” available to wildlife, and have significant impacts on organisms that have evolved to deal with specific characteristics and regimes of light. By altering how much light is present in a habitat, where it occurs, how bright it is, what wavelengths it contains, and when it illuminates the environment, we might inadvertently impact a variety of wildlife traits, including behaviors (such as foraging, navigation, and communication), physiology (including cyclical release of hormones and other important chemicals), and interactions with other species.



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