Sound imaging of nocturnal animal calls in their natural habitat
Sound imaging of nocturnal animal calls in their natural habitat
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DOI：
10.1007/s00359-011-0652-7
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发表时间：
2011-09-01
影响因子：
2.1
通讯作者：
Okuno, Hiroshi G.
中科院分区：
文献类型：
--
作者：
Mizumoto, Takeshi;Aihara, Ikkyu;Okuno, Hiroshi G.
我们提出了一种夜行动物间声通信成像的新方法。研究夜行动物（如青蛙和蟋蟀）的时空呼叫行为一直很困难，因为需要在嘈杂的环境中区分许多动物的呼叫，而不能看到它们。我们的方法使用数十个声光转换设备（称为“萤火虫”）和一个现成的摄像机来可视化空间和时间动态。萤火虫由一个麦克风和一个发光二极管组成，当它捕捉到附近的声音时就会发光。在目标区域部署了几十只萤火虫，我们通过摄像机录下了多个个体的通话。我们用日本树蛙（Hyla japonica）进行了两个实验，一个在室内，另一个在野外。室内实验结果表明，该方法对日本树蛙的鸣叫行为具有较好的可视化效果。它证实了已知的行为；两只青蛙同步呼叫或反相位同步呼叫。田间实验（在日本树蛙生活的稻田）也可视化了相同的叫声行为，以证实田间的反相位同步。实验结果证实，我们的方法可以可视化夜行动物在自然栖息地的鸣叫行为。
We present a novel method for imaging acoustic communication between nocturnal animals. Investigating the spatio-temporal calling behavior of nocturnal animals, e.g., frogs and crickets, has been difficult because of the need to distinguish many animals' calls in noisy environments without being able to see them. Our method visualizes the spatial and temporal dynamics using dozens of sound-to-light conversion devices (called "Firefly") and an off-the-shelf video camera. The Firefly, which consists of a microphone and a light emitting diode, emits light when it captures nearby sound. Deploying dozens of Fireflies in a target area, we record calls of multiple individuals through the video camera. We conduct two experiments, one indoors and the other in the field, using Japanese tree frogs (Hyla japonica). The indoor experiment demonstrates that our method correctly visualizes Japanese tree frogs' calling behavior. It has confirmed the known behavior; two frogs call synchronously or in anti-phase synchronization. The field experiment (in a rice paddy where Japanese tree frogs live) also visualizes the same calling behavior to confirm anti-phase synchronization in the field. Experimental results confirm that our method can visualize the calling behavior of nocturnal animals in their natural habitat.