Barometer logging reveals new dimensions of individual songbird migration
Barometer logging reveals new dimensions of individual songbird migration
复制标题
晴雨表记录揭示了个体鸣禽迁徙的新维度
作者：
Sissel Sjöberg;Lykke Pedersen;Gintaras Malmiga;T. Alerstam;B. Hansson;D. Hasselquist;K. Thorup;A. P. Tøttrup;Arne Andersson;J. Bäckman
跟踪技术的最新进展基于使用微型传感器来记录个体迁徙行为的新方面。在这项研究中，我们使用带有气压和温度传感器的活动数据记录仪来记录迁徙鸣禽静止期间的飞行高度和地面高度。我们追踪了一只红背伯劳和一只芦苇莺从欧洲到非洲的秋季迁徙过程。两个人都在旅行阶段逐步进行迁徙，并在穿越地中海和撒哈拉沙漠期间爬升了最多米，在欧洲的第一个飞行阶段爬升了最少米。芦苇莺的最高飞行高度为 3950 米。在从欧洲到西非的航段中，红背伯劳在从萨赫勒到南部非洲的航段中，最高飞行高度达到了3650米。两个人在迁徙过程中都使用低地和高地作为休息时间。此外，在两个个体的迁徙飞行过程中，温度随着高度的增加而降低，这凸显了通过温度测量来确定飞行持续时间的潜力。最后，我们讨论如何使用气压数据来研究鸟类对气压变化的反应，作为迁徙航班起飞的线索。这项新技术，即使用带有气压传感器的微型数据记录仪来估计飞行高度和地面高度，将为研究开辟新的途径，并重要地增进我们对小型鸟类在迁徙飞行中行为的理解。 （较少的）
Recent advances in tracking technology are based on the use of miniature sensors for recording new aspects of individual migratory behaviour. In this study, we have used activity data loggers with barometric and temperature sensors to record the flight altitudes as well as ground elevations during stationary periods of migratory songbirds. We tracked one individual of red-backed shrike and one great reed warbler along their autumn migration from Europe to Africa. Both individuals performed their migration stepwise in travel segments and climbed most metres during the passage across the Mediterranean Sea and the Sahara Desert and least metres during the first flight segment in Europe. The great reed warbler reached its highest flight altitude of 3950 m a.s.l. during the travel segment from Europe to west Africa, while the red-backed shrike reached 3650 m a.s.l as maximum flight altitude during its travel segment from Sahel to southern Africa. Both individuals used both lowlands and highlands for resting periods along their migrations. Furthermore, temperature decreased with increasing altitude during migratory flights for both individuals, highlighting the potential to determine flight duration from temperature measurements. Finally, we discuss how barometric data could be used to investigate birds’ responses to changes in air pressure as a cue for departures on migratory flights. This new technique, i.e. using a miniature data logger with barometric pressure sensor to estimate flight altitudes and ground elevations, will open up new avenues for research and importantly advance our understanding on how small birds behave during migratory flights. (Less)