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Assessing the effects of artificial light at night on biodiversity across latitude – Current knowledge gaps
Global Ecology and Biogeography ( IF 6.4 ) Pub Date : 2019-11-22 , DOI: 10.1111/geb.13037
Jean Secondi 1, 2 , Aurélie Davranche 3 , Marc Théry 4 , Nathalie Mondy 1 , Thierry Lengagne 1
Affiliation  

Aim: Exposure to artificial light at night (ALAN) is a risk factor for organisms. Considering the spread and increasing intensity of night brightness across the globe, and the key role of light at all biological levels, alterations of ecosystems are ex- pected. Yet, we cannot predict the severity of the effects of ALAN in several biomes because little information is available outside the temperate zone. We reviewed cur- rent knowledge and identified traits that could be targeted to fill this knowledge gap in order to contribute to the elaboration of a biogeographical framework for the study of ALAN at the global scale. Location: Global. Time period: Current and next decades. Methods: We analysed the latitudinal variation in ALAN and focused on environ- mental factors that vary with latitude but that have been overlooked. We reviewed biological traits that exhibit latitudinal variation and depend on light and photoperiod and compiled information about the predicted changes in human demography and road networks across different world regions. Results: Cloud cover amplifies ALAN far away from urbanized areas. Because of the higher frequency of overcast sky nights, exposure effects may be stronger both at high latitudes and across a large fraction of the intertropical zone, although at dif- ferent times of the year. Intertropical biomes host the largest fraction of global bio- diversity. Although currently they are not the most exposed to ALAN, their human populations are growing, and urbanized areas and road networks are expanding. Hence, ALAN could have strong ecological consequences, with cloud cover as an aggravating factor. Perspectives: Knowledge gaps currently limit our ability to predict the effects of ALAN in different biomes. Therefore, it will be important to start investigating the consequences of this novel environmental factor across the globe, in order to de- velop a relevant theoretical framework.

中文翻译:

评估夜间人造光对跨纬度生物多样性的影响——当前的知识差距

目标:夜间暴露于人造光 (ALAN) 是生物体的危险因素。考虑到夜间亮度在全球范围内的传播和强度的增加,以及光在所有生物层面的关键作用,预计生态系统会发生变化。然而,我们无法预测 ALAN 在几个生物群落中影响的严重程度,因为在温带以外几乎没有可用的信息。我们回顾了当前的知识并确定了可以有针对性地填补这一知识空白的特征,以便为在全球范围内制定 ALAN 研究的生物地理学框架做出贡献。地点:全球。时间段:当前和未来几十年。方法:我们分析了 ALAN 的纬度变化,重点关注随纬度变化但被忽视的环境因素。我们回顾了表现出纬度变化并依赖于光和光周期的生物特征,并汇编了有关世界不同地区人类人口统计学和道路网络预测变化的信息。结果:云覆盖放大远离城市化地区的 ALAN。由于阴天夜的频率较高,尽管在一年中的不同时间,高纬度地区和大部分热带地区的暴露效应可能更强。热带生物群落拥有全球生物多样性的最大部分。虽然目前他们并不是最容易受到 ALAN 影响的地区,但他们的人口正在增长,城市化地区和道路网络正在扩大。因此,ALAN 可能会产生强烈的生态后果,云层覆盖是一个加重因素。观点:知识差距目前限制了我们预测 ALAN 在不同生物群落中的影响的能力。因此,重要的是开始调查这种新环境因素在全球范围内的后果,以制定相关的理论框架。
更新日期:2019-11-22
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