With climate warming, organisms are shifting their ranges towards the poles, tracking their optimal thermal environments. Day-length, the driver of daily and annual timing, is, however, fixed by latitude and date. Timing and photoreception mechanisms adapted to ancestral photic environments may restrict range-shift capacity, resulting in photic barriers to range-shifts.

中文翻译：

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向障碍范围转移的光合屏障。

随着气候变暖，生物体将其范围移向两极，追踪其最佳热环境。但是，日长是每日和每年时间的驱动因素，但由纬度和日期确定。适应祖先光环境的时间和光接收机制可能会限制距离转换能力，从而导致距离转换的光障。