Tasha Oosthuizen, Neville Pillay, Maria K Oosthuizen
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引用次数: 0
摘要
城市化以及随之而来的夜间人工照明(ALAN)会扰乱动物的活动。食物网底部的这种干扰会波及整个生态系统。大多数有关 ALAN 的研究都是在实验室中进行的。因此,我们缺乏自然环境条件下动物昼夜节律反应的基本信息,无法全面评估 ALAN 的影响。我们研究了野生捕获的城市周边单条草鼠(Lemniscomys rosalia)在自然条件下和标准实验室条件下的行为和活动,包括模拟它们可能经历的夜间昏暗光线条件。在所有实验处理中,该物种都主要表现出匍匐活动。在自然处理下,它的活动水平最高,而 ALAN 则明显抑制了它的活动。在所有实验处理下,雄性比雌性更活跃。由于全球变化和城市化会导致植被密度和组成发生变化,从而减少适宜的微生境数量,使小型哺乳动物面临新的生境变化,因此,ALAN下活动的明显变化尤其值得关注。我们认为,单纹鼠可能会因为城市化而变得脆弱,从而对其生态系统产生广泛的影响。
Wild mice in an urbanized world: Effects of light at night under natural and laboratory conditions in the single-striped grass mouse (Lemniscomys rosalia).
Urbanization, and the accompanying artificial light at night (ALAN), can disrupt the activity of animals. Such disruptions at the base of a food web can ripple through the ecosystem. Most studies of ALAN are performed in the laboratory. Thus, we lack basic information about the circadian responses of animals under natural environmental conditions to fully evaluate the impact of ALAN. We studied the behaviour and activity of wild-caught, peri-urban single-striped grass mice (Lemniscomys rosalia) under a natural treatment and in a standard laboratory treatment, including dim light at night to mimic conditions that they could experience. The species exhibited predominantly crepuscular activity under all experimental treatments. It showed the highest level of activity under the natural treatment, whereas ALAN significantly suppressed its activity. Males were more active than females under all experimental treatments. The marked changes in activity under ALAN is of particular concern since global change in combination with urbanization can lead to a change in vegetation density and composition that will decrease the number of suitable microhabitats and expose small mammals to novel habitat changes. We suggest that the single-striped mice could become vulnerable because of urbanization, leading to impacts on its ecosystem broadly.
期刊介绍:
Chronobiology International is the journal of biological and medical rhythm research. It is a transdisciplinary journal focusing on biological rhythm phenomena of all life forms. The journal publishes groundbreaking articles plus authoritative review papers, short communications of work in progress, case studies, and letters to the editor, for example, on genetic and molecular mechanisms of insect, animal and human biological timekeeping, including melatonin and pineal gland rhythms. It also publishes applied topics, for example, shiftwork, chronotypes, and associated personality traits; chronobiology and chronotherapy of sleep, cardiovascular, pulmonary, psychiatric, and other medical conditions. Articles in the journal pertain to basic and applied chronobiology, and to methods, statistics, and instrumentation for biological rhythm study.
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