Crocodylus niloticus (Crocodilia) is highly sensitive to water surface waves.

Crocodylus niloticus (Crocodilia) is highly sensitive to water surface waves.
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尼罗鳄(Crocodilia)对水面波浪高度敏感

DOI:
10.1016/j.zool.2015.03.004
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发表时间:
2015
期刊:
影响因子:
2
通讯作者:
Bleckmann H
Bleckmann H
中科院分区:
生物学3区
文献类型:
--
作者:
Grap NJ;Monzel A;Kohl T;Bleckmann H

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鳄鱼对水面波刺激表现出定向反应,但目前尚不清楚行为阈值。本研究确定了鳄鱼对水面波浪的行为阈值。尼罗鳄(Crocodylus niloticus)通过向水面吹气产生单频水表面波刺激(持续时间1150 ms,频率15、30、40、60和80 Hz)。我们的研究表明c。niloticusus对毛细水表面波高度敏感。阈值随频率的增加而降低,波幅在10.3 μm (15 Hz) ~ 0.5 μm (80 Hz)之间。在15赫兹和30赫兹的频率下,还测试了一只眼镜凯门鳄(凯门鳄)对水面波的敏感性。阈值从12.8 μm (15 Hz)下降到1.76 μm (30 Hz),接近c的阈值。niloticus。鳄鱼的表面波敏感性与半水生昆虫和捕鱼蜘蛛的表面波敏感性相似,但与高一到两个数量级的水面摄食鱼类的表面波敏感性不匹配。
Crocodiles show oriented responses to water surface wave stimuli but up to now behavioral thresholds are missing. This study determines the behavioral thresholds of crocodilians to water surface waves. Nile crocodiles (Crocodylus niloticus) were conditioned to respond to single-frequency water surface wave stimuli (duration 1150 ms, frequency 15, 30, 40, 60 and 80 Hz), produced by blowing air onto the water surface. Our study shows thatC. niloticusis highly sensitive to capillary water surface waves. Threshold values decreased with increasing frequency and ranged between 10.3 μm (15 Hz) and 0.5 μm (80 Hz) peak-to-peak wave amplitude. For the frequencies 15 Hz and 30 Hz the sensitivity of one spectacled caiman (Caiman crocodilus) to water surface waves was also tested. Threshold values were 12.8 μm (15 Hz) down to 1.76 μm (30 Hz), i.e. close to the threshold values ofC. niloticus. The surface wave sensitivity of crocodiles is similar to the surface wave sensitivity of semi-aquatic insects and fishing spiders but does not match the sensitivity of surface-feeding fishes which is higher by one to two orders of magnitude.
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