在极低的白天光线下,夜间迁徙的海上飞行飞行
Gabriel Norevik1, Susanne Åkesson1, Anders Hedenström1
1Centre for Animal Movement Research, Department of Biology, Lund University, 223 62 Lund, Sweden.
PNAS nexus
|July 21, 2023
概括
欧洲夜穿越海洋时飞得很低,以节省能源. 他们使用靠近水面的滑技术,在长途迁徙期间降低了飞行成本.
科学领域:
- 鸟类学 鸟类学是一门学科.
- 动物行为 动物行为
- 空气动力学 航空动力学
背景情况:
- 长途动物迁徙往往涉及海上穿越,这给陆地鸟类带来了长时间飞行和能量耗尽的风险.
- 了解飞行策略和这些过境期间的能源消耗对于鸟类的生存和迁徙演变至关重要.
研究的目的:
- 调查欧洲夜鸟在海上航行期间的飞行行为,路线选择和燃料动态.
- 确定环境因素和飞行策略如何影响能源消耗和生存前景.
主要方法:
- 追踪欧洲夜的夜间迁移,穿越水障碍.
- 分析飞行行为,包括高度和飞行风格 (翼滑翔).
- 通过检查地表-空气界面层内的滑翔比例和能源效率来评估飞行成本.
主要成果:
- 障碍物大小和地面速度会影响延长白天飞行的可能性.
- 在一夜之间穿越水体的夜经常参与白天飞行.
- 鸟类降到海平面附近,使用飞滑翔来飞行地面效应,大大降低了飞行成本.
结论:
- 在地面效应下飞越地面的飞行是迁徙鸟类的节能运输方式.
- 这一策略使得鸟类能够利用海面附近的空气动力学优势.
- 这些发现需要重新评估跨海的鸟类迁徙策略.
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