How well do electric fish electrolocate under jamming?
How well do electric fish electrolocate under jamming?
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电鱼在干扰下的电定位效果如何？
DOI：
10.1007/bf00656862
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
W. Heiligenberg
中科院分区：
文献类型：
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作者：
J. Matsubara;W. Heiligenberg
本研究通过行为学实验，对两种弱电鱼类的电定位能力及其对电噪声的敏感性进行了研究。
1.与所有其他发射波的电鱼相比，Sternopygus不表现出干扰回避响应（Jamming Avoidance Response，简称JAE），即，它不会将其电器官放电（EOD）频率从与其自身EOD频率足够接近的同种或电子发生器信号的频率移开。2.胸臀鱼缺乏一种已知在其他电鱼中保护电定位能力的机制，这与其电定位性能对干扰信号的不寻常的“免疫性”自适应地相关。只有在强的正弦刺激强度下，比鱼自身的近场EOD强度强50倍，才开始损害Sternopygus的电定位性能。相反，Eigenmannia的电定位性能受到与动物自身近场EOD强度一样弱的刺激的极大损害。3. Sternopygus（给予足够强度的刺激）和Eigenmannia最容易受到与其自身EOD频率略有不同的刺激频率的影响;即，当ΔF=1至4 Hz时（图2、3）。然而，在这两种情况下，电定位性能在ΔFs=0 Hz时有所改善（不准确度为0.016 Hz）;在这种情况下，振幅等于其近场强度，Eigenmannia的电定位性能几乎提高到没有干扰时的水平（图3）。这些结果提供了一个行为相关的预测不仅基于理论模型，而且以前的神经生理学研究的中央电感受单位。
SummaryIn two species of weakly electric fish, electrolocation performance and its vulnerability to electrical noise were assessed through behavioral experiments, providing the following results.
1.In contrast to all other wave-emitting electric fish,Sternopygus does not exhibit a Jamming Avoidance Response (JAR), i.e., it does not shift its Electric Organ Discharge (EOD) frequency away from either a conspecific's or an electronic generator signal's frequency which is sufficiently close to its own EOD frequency.2.Sternopygus' lack of a JAR, a mechanism known to protect electrolocation abilities in other electric fish, is adaptively correlated with an unusual “immunity” of its electrolocation performance to jamming signals. It is only with strong sinusoidal stimulus intensities, as great as 50 times stronger than the fish's own near field EOD intensity, that impairment of electrolocation performance begins inSternopygus. In contrast, electrolocation performance inEigenmannia is greatly impaired by stimuli as weak as the animal's own near field EOD intensity.3.BothSternopygus (given stimuli of sufficient intensity) andEigenmannia are most vulnerable to stimulus frequencies which differ slightly from their own EOD frequency; i.e., whenΔF=1 to 4 Hz (Figs. 2,3). However, in both genera electrolocation performance improves forΔFs=0 Hz (inaccuracy of 0.016 Hz); in this case, with amplitudes equal to its near field intensity,Eigenmannia's electrolocation performance improves almost to levels observed in the absence of jamming (Fig. 3). These results provide a behavioral correlate not only to predictions based on theoretical models but also to previous neurophysiological studies on central electroreceptive units.