Prey pursuit and interception in dragonflies
Prey pursuit and interception in dragonflies
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DOI：
10.1007/s003590050015
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发表时间：
2000-02-01
期刊：
影响因子：
--
通讯作者：
Venator, KR
中科院分区：
文献类型：
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作者：
Olberg, RM;Worthington, AH;Venator, KR
栖息蜻蜓是坐着等待的捕食者，它们起飞并追逐小型飞行昆虫。为了研究它们的猎物追捕策略，我们拍摄了36只雄性蜻蜓的捕食飞行视频，用于逐帧分析。我们发现，蜻蜓通过操纵使猎物的图像在视网膜上的移动最小化，直接飞向猎物拦截点。这种行为可以由目标选择性下行中间神经元引导，这些中间神经元对小物体运动显示出方向选择性的视觉反应。我们调查了蜻蜓如何辨别潜在猎物的距离。我们发现，在起飞前不久，猎物的角速度达到了一个峰值，这可能会提示蜻蜓向附近的飞行目标飞行。头部运动的视差信息不是成功追捕猎物所必需的。
Perching dragonflies (Libellulidae; Odonata) are sit-and-wait predators, which take off and pursue small flying insects. To investigate their prey pursuit strategy, we videotaped 36 prey-capture flights of male dragonflies, Erythemis simplicicollis and Leucorrhinia intacta, for frame-by-frame analysis. We found that dragonflies fly directly toward the point of prey interception by steering to minimize the movement of the prey's image on the retina. This behavior could be guided by target-selective descending interneurons which show directionally selective visual responses to small object movement. We investigated how dragonflies discriminate distance of potential prey. We found a peak in angular velocity of the prey shortly before take-off which might cue the dragonfly to nearby flying targets. Parallax information from head movements was not required for successful prey pursuit.