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远洋海鸟飞入风暴眼以降低风险。

Pelagic seabirds reduce risk by flying into the eye of the storm.

机构信息

Department of Biosciences, Swansea University, Swansea, SA2 8PP, United Kingdom.

School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom.

出版信息

Proc Natl Acad Sci U S A. 2022 Oct 11;119(41):e2212925119. doi: 10.1073/pnas.2212925119. Epub 2022 Oct 4.

Abstract

Cyclones can cause mass mortality of seabirds, sometimes wrecking thousands of individuals. The few studies to track pelagic seabirds during cyclones show they tend to circumnavigate the strongest winds. We tracked adult shearwaters in the Sea of Japan over 11 y and found that the response to cyclones varied according to the wind speed and direction. In strong winds, birds that were sandwiched between the storm and mainland Japan flew away from land and toward the eye of the storm, flying within ≤30 km of the eye and tracking it for up to 8 h. This exposed shearwaters to some of the highest wind speeds near the eye wall (≤21 m s) but enabled them to avoid strong onshore winds in the storm's wake. Extreme winds may therefore become a threat when an inability to compensate for drift could lead to forced landings and collisions. Birds may need to know where land is in order to avoid it. This provides additional selective pressure for a map sense and could explain why juvenile shearwaters, which lack a map sense, instead navigating using a compass heading, are susceptible to being wrecked. We suggest that the ability to respond to storms is influenced by both flight and navigational capacities. This may become increasingly pertinent due to changes in extreme weather patterns.

摘要

旋风会导致海鸟大量死亡,有时会摧毁数千只个体。少数跟踪旋风中海鸟的研究表明,它们往往会绕过最强风区。我们在日本海追踪成年剪水鹱超过 11 年,发现它们对旋风的反应因风速和风向而异。在强风下,被风暴和日本大陆夹在中间的鸟类会远离陆地,飞向风暴眼,在离风暴眼 30 公里以内飞行,并跟踪长达 8 小时。这使剪水鹱暴露在眼壁附近的一些最高风速下(≤21 米/秒),但使它们能够避开风暴尾迹中的强陆上风。当无法补偿漂移导致被迫着陆和碰撞时,极端风可能会成为一种威胁。鸟类可能需要知道陆地在哪里才能避开它。这为地图感提供了额外的选择性压力,也可以解释为什么缺乏地图感的幼鸟反而使用罗盘航向导航,容易被摧毁。我们认为,应对风暴的能力受到飞行和导航能力的影响。由于极端天气模式的变化,这可能变得越来越重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a945/9565516/b5451dd09f92/pnas.2212925119fig01.jpg

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