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Validation of a device for accurate timing of feeding events in marine animals

机译:验证准确计时海洋动物进食事件的装置

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Two acceleration data loggers, each measuring surging and heaving acceleration, were attached to the head and mandible of three captive hooded seals, Cystophora cristata, for detection of underwater feeding events. Three sizes of prey: Atlantic herring (large), capelin (medium), and half a capelin (small) were tested. A highpass frequency-filtering method at 3 Hz provided more distinct prey ingestion signals for both head and mandible acceleration. The surge-axis signals from head acceleration suggested that the seals ingested their prey not only by biting, but also by thrusting. Moreover, prey ingestion movements showed higher surging acceleration from mandible than from head (mean ± SD from head: 5.37 ± 4.45 m s~(-2), from mandible: 8.43 ± 5.15 m s~(-2), n = 153), indicating that the data from the head is not required for precise identification of feeding events. Thus, our mandible acceleration device provides a practical method for the timing of underwater feeding events in seals.
机译:将两个加速度数据记录器(分别测量浪涌和起伏加速度)连接到三个圈养带帽海豹Cystophora cristata的头部和下颌,以检测水下摄食事件。测试了三种尺寸的猎物:大西洋鲱鱼(大),毛鳞鱼(中)和半毛鳞鱼(小)。 3 Hz的高通频率滤波方法为头部和下颌的加速度提供了更多不同的猎物摄取信号。来自头部加速度的喘振轴信号表明,海豹不仅通过咬食而且通过推入来吞食猎物。此外,猎物的食入运动显示出下颌骨比头颅更高的浪涌加速度(头颅的平均±SD:5.37±4.45 ms〜(-2),下颌骨的平均±SD:8.43±5.15 ms〜(-2),n = 153)精确识别喂食事件不需要头部数据。因此,我们的下颌骨加速装置提供了一种实用的方法来确定海豹在水下进食的时间。

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