Nocturnal flight behavior of waterbirds in close proximity to a transmission powerline in the Florida Everglades
Nocturnal flight behavior of waterbirds in close proximity to a transmission powerline in the Florida Everglades
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DOI：
10.2307/1522074
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发表时间：
2001-12-01
期刊：
影响因子：
0.3
通讯作者：
Frederick, P
中科院分区：
文献类型：
--
作者：
Deng, J;Frederick, P
许多鸟类在夜间活动，尽管与静止结构相撞的可能性很大，但人们对鸟类对此类结构的反应知之甚少。我们研究了在佛罗里达大沼泽地平坦开阔的地貌中，水鸟与550伏输电线路之间的夜间相互作用，使用监视雷达来探测来袭的鸟类，并使用夜视光学设备来观察飞行行为。在118个小时的观察中，我们记录到在1997年春季，共有285只环状鸟类穿过输电线。我们目视观察了187个鸟群的663只鸟，并记录了它们对电力线的反应。我们发现，飞行方向和栖息地位置强烈地表明了一些物种有规律的夜间觅食行为，特别是黑冠夜鹭(Nycticorax Nycticorax)和树鹤(Mycteria Americana)。夜间飞行的鸟儿不太可能对电力线做出反应，这表明电力线在黑暗中可能会构成更大的碰撞威胁。然而，我们也发现，水鸟在晚上飞得比白天高，因此进入潜在接触电力线的区域的频率比白天要少得多。
Many birds move at night, and although there is strong potential for collisions with stationary structures, the behavior of birds in response to such structures is poorly understood. We studied the nocturnal interactions of waterbirds with a 550v transmission powerline in the flat, open landscape of the Florida Everglades using a combination of surveillance radar to detect incoming birds, and night vision optical equipment to observe flight behavior. During 118 hours of observation we recorded a total of 285 flocks of ciconiiform birds crossing the powerline during spring 1997. We visually observed 663 birds in 187 flocks, and documented their response to the powerline. We found that the flight directions and the colony site locality strongly suggested regular nocturnal foraging behavior of some species, especially Black-crowned Night Herons (Nycticorax nycticorax) and Wood Storks (Mycteria americana). Birds flying at night were less likely to react to the powerline, suggesting that powerlines may pose more of a collision threat during darkness. However, we also found that waterbirds flew higher at night than during the day and thus came into a zone of potential contact with the powerline much less often than during the day.