Migratory lifestyle carries no added overall energy cost in a partial migratory songbird

IF 13.9 1区 生物学 Q1 ECOLOGY
Nils Linek, Scott W. Yanco, Tamara Volkmer, Daniel Zuñiga, Martin Wikelski, Jesko Partecke
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引用次数: 0

Abstract

Seasonal bird migration may provide energy benefits associated with moving to areas with less physiologically challenging climates or increased food availability, but migratory movements themselves may carry high costs. However, time-dynamic energy profiles of free-living migrants—especially small-bodied songbirds—are challenging to measure. Here we quantify energy output and thermoregulatory costs in partially migratory common blackbirds using implanted heart rate and temperature loggers paired with automated radio telemetry and energetic modelling. Our results show that blackbirds save considerable energy in preparation for migration by decreasing heart rate and body temperature 28 days before departure, potentially dwarfing the energy costs of migratory flights. Yet, in warmer wintering areas, migrants do not appear to decrease total daily energy expenditure despite a substantially reduced cost of thermoregulation. These findings indicate differential metabolic programmes across different wintering strategies despite equivalent overall energy expenditure, suggesting that the maintenance of migration is associated with differences in energy allocation rather than with total energy expenditure.

Abstract Image

迁徙生活方式不会增加部分迁徙鸣禽的总体能量成本
季节性鸟类迁徙可能会带来能量方面的益处,因为迁徙到的地区气候条件对生理挑战较小或食物供应增加,但迁徙本身也可能带来高昂的成本。然而,自由生活的迁徙鸟类--尤其是小体型鸣禽--的时间动态能量曲线很难测量。在这里,我们使用植入式心率和体温记录仪,配合自动无线电遥测和能量模型,量化了部分迁徙的普通乌鸫的能量输出和体温调节成本。我们的结果表明,黑鸟在出发前28天通过降低心率和体温为迁徙做准备,从而节省了大量能量,这可能使迁徙飞行的能量成本相形见绌。然而,在温暖的越冬地区,尽管体温调节的成本大大降低,迁徙者似乎并没有减少每天的总能量消耗。这些研究结果表明,尽管总体能量消耗相同,但不同越冬策略下的新陈代谢方案不同,这表明维持迁徙与能量分配的差异有关,而不是与总能量消耗有关。
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来源期刊
Nature ecology & evolution
Nature ecology & evolution Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
22.20
自引率
2.40%
发文量
282
期刊介绍: Nature Ecology & Evolution is interested in the full spectrum of ecological and evolutionary biology, encompassing approaches at the molecular, organismal, population, community and ecosystem levels, as well as relevant parts of the social sciences. Nature Ecology & Evolution provides a place where all researchers and policymakers interested in all aspects of life's diversity can come together to learn about the most accomplished and significant advances in the field and to discuss topical issues. An online-only monthly journal, our broad scope ensures that the research published reaches the widest possible audience of scientists.
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