Artificial light at night (ALAN) is one form of human-induced rapid environmental changes (HIREC) and is strongly interfering with natural dark–light cycles. Some personality types within a species might be better suited to cope with environmental change and therefore might be selected upon under ongoing urbanization. We used LED street lamps in a large outdoor enclosure to experimentally investigate the effects of ALAN on activity patterns, movement and interaction of individuals of two species, the bank vole (Myodes glareolus) and the striped field mouse (Apodemus agrarius). We analyzed effects combined with individual boldness score. Both species reduced their activity budget during daylight hours. While under natural light conditions home ranges were larger during daylight than during nighttime, this difference vanished under ALAN. Conspecifics showed reduced home range overlap, proximity and activity synchrony when subjected to nighttime illumination. Changes in movement patterns in reaction to ALAN were not associated with differences in boldness score of individuals. Our results suggest that light pollution can lead to changes in movement patterns and individual interactions in small mammals. This could lead to fitness consequences on the population level.

中文翻译：

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光污染会影响两种小型哺乳动物物种的空间利用和相互作用，而不论其性格如何

夜间人造光（ALAN）是人为引起的快速环境变化（HIREC）的一种形式，强烈干扰自然暗光循环。一个物种中的某些人格类型可能更适合应对环境变化，因此可能会在持续的城市化进程中进行选择。我们在大型室外外壳中使用了LED路灯，以实验研究ALAN对两种活动个体的活动模式，运动和相互作用的影响，这两种物种分别是田鼠（Myodes glareolus）和条纹田鼠（Apodemus agrarius）。我们分析了结合个人胆量得分的效果。两种物种都在白天减少了活动预算。虽然在自然光条件下，白天的房屋范围比夜间的范围大，但在ALAN下这种差异消失了。当夜间照明时，同种菌显示出减少的家庭范围重叠，接近和活动同步。对ALAN的反应中运动方式的变化与个体的大胆评分差异无关。我们的结果表明，光污染会导致小型哺乳动物的运动方式和个体相互作用发生变化。这可能会导致人口健康状况的恶化。