Clocks for the city: circadian differences between forest and city songbirds
Clocks for the city: circadian differences between forest and city songbirds
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DOI：
10.1098/rspb.2013.0593
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发表时间：
2013-07-22
影响因子：
4.7
通讯作者：
Partecke, J.
中科院分区：
文献类型：
--
作者：
Dominoni, D. M.;Helm, B.;Partecke, J.
为了跟上城市化进程的步伐，生物体必须应对广泛的栖息地变化。人为的光和噪音改变了昼夜差异，从而可能干扰生物钟。众所周知，城市化物种，例如鸟类，会将其活动提前到清晨和夜间。我们假设这种改变的活动模式是通过内源生物钟的特性反映出来的。我们使用自动无线电遥测技术，通过比较自由生活的森林和城市欧洲黑鸟（Turdus merula）的活动模式来测试这个想法。然后我们重新捕获了相同的个体并记录了他们在恒定条件下的活动。与森林鸟类相比，城市鸟类更早开始活动，运动活动的昼夜节律波动更快但不那么强烈。昼夜节律周期的长度预示着野外活动的开始，这种关系主要是通过快节奏和早起的城市鸟类来解释的。尽管仅基于两个种群，但我们的研究结果指出了城市生活、鸣禽的时间型和昼夜节律表型之间的联系，以及可能存在于城市栖息地的其他生物体中的联系，并强调城市环境可以显着改变野生生物体的重要生物学节律。
To keep pace with progressing urbanization organisms must cope with extensive habitat change. Anthropogenic light and noise have modified differences between day and night, and may thereby interfere with circadian clocks. Urbanized species, such as birds, are known to advance their activity to early morning and night hours. We hypothesized that such modified activity patterns are reflected by properties of the endogenous circadian clock. Using automatic radio-telemetry, we tested this idea by comparing activity patterns of free-living forest and city European blackbirds (Turdus merula). We then recaptured the same individuals and recorded their activity under constant conditions. City birds started their activity earlier and had faster but less robust circadian oscillation of locomotor activity than forest conspecifics. Circadian period length predicted start of activity in the field, and this relationship was mainly explained by fast-paced and early-rising city birds. Although based on only two populations, our findings point to links between city life, chronotype and circadian phenotype in songbirds, and potentially in other organisms that colonize urban habitats, and highlight that urban environments can significantly modify biologically important rhythms in wild organisms.