Exploitation of an ancient escape circuit by an avian predator: Relationships between taxon-specific prey escape circuits and the sensitivity to visual cues from the predator
Exploitation of an ancient escape circuit by an avian predator: Relationships between taxon-specific prey escape circuits and the sensitivity to visual cues from the predator
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DOI：
10.1159/000057565
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发表时间：
2001-01-01
影响因子：
1.7
通讯作者：
Strausfeld, NJ
中科院分区：
文献类型：
--
作者：
Jablonski, PG;Strausfeld, NJ
彩绘红尾椋鸟Myioborus pictus使用视觉显示器来冲洗，追逐，然后捕捉大量配备有巨大纤维逃逸电路的短角双翅目。本文研究了巨纤维系统的特征、红尾椋鸟产生的视觉刺激的结构与其诱发果蝇逃避反应的有效性之间的关系。结果表明，双翅目类群具有大直径的巨纤维，从大脑延伸短距离的运动神经元参与逃避冲洗在更大的距离比类群更长和小直径的巨纤维。行为测试的结果表明，角加速度的扩展图像边缘的复眼在引发逃避反应的重要性。刺激轮廓边缘的横向运动以及结构化视觉轮廓另外有助于触发逃避的一个或多个神经系统的敏感性。已知视网膜对侧和角速度触发果蝇巨纤维回路的生理反应，但边缘长度和横向运动在隐现刺激中的贡献表明，逃逸通路也可能接收来自调谐到不同类型运动的回路的输入。目前的研究结果表明，这几个性能的逃生途径作出了贡献的觅食显示器和羽毛图案的进化在冲洗追求鸟类。版权所有（C）2002 S. Karger AG，巴塞尔。
The painted redstart Myioborus pictus uses visual displays to flush, pursue, and then capture an abundance of brachyceran Diptera that are equipped with giant fiber escape circuits. This paper investigates the relationships between features of the giant fiber system, the structure of visual stimuli produced by redstarts and their effectiveness in eliciting escape reactions by flies. The results show that dipterous taxa having large-diameter giant fibers extending short distances from the brain to motor neurons involved in escape are flushed at greater distances than taxa with longer and small-diameter giant fibers. The results of behavioral tests show the importance of angular acceleration of expanding image edges on the compound eye in eliciting escape responses. Lateral motion of stimulus profile edges as well as structured visual profiles additionally contribute to the sensitivity of one or more neural systems that trigger escape. Retinal subtense and angular velocity are known to trigger physiological responses in fly giant fiber circuits, but the contributions of edge length and lateral motion in a looming stimulus suggest that escape pathways might also receive inputs from circuits that are tuned to different types of motion. The present results suggest that these several properties of escape pathways have contributed to the evolution of foraging displays and plumage patterns in flush-pursuing birds. Copyright (C) 2002 S. Karger AG, Basel.