Physiological and behavioral studies of escape responses in calanoid copepods
Physiological and behavioral studies of escape responses in calanoid copepods
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DOI：
10.1080/10236249609378965
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发表时间：
1996-01-01
影响因子：
1
通讯作者：
Herren, CM
中科院分区：
文献类型：
--
作者：
Hartline, DK;Lenz, PH;Herren, CM
电生理技术已被用于监测鱿鱼类桡足类动物第一触角的感觉放电。来自机械感受器和假定的化学感受器的细胞外神经冲动交通已被记录。一些（但不是全部）类calanoid群的第一个触角具有“巨大的”机械接收轴突，产生非常大（mV）的细胞外信号。在每个远端尖端的刚毛上有两个这样的巨大的触角机械感受器（GAMs）。它们对小（< 10 nm）可控的流体动力干扰敏感，包括突然位移和频率高达或超过2 kHz的正弦振动。行为学研究表明，同样类型的干扰也可以触发马杜拉唇瓣虫的“跳跃”。在大约900赫兹的频率下，灵敏度低至4纳米。行为敏感性与生理上测量的相似，表明GAMs的激活能够触发逃避行为，甚至可能是单一的神经冲动。
Electrophysiological techniques have been applied to monitoring sensory discharges from the first antennae of calanoid copepods. Extracellular nerve impulse traffic from both mechanoreceptors and putative chemoreceptors has been recorded. The first antennae of some, but not all, calanoid groups possess ''giant'' mechano receptive axons generating very large (mV) extracellular signals. There are two such giant antennal mechano receptors (GAMs) innervating setae of each distal tip. These are sensitive to small (< 10 nm) controlled hydrodynamic disturbances, including abrupt displacements and sinusoidal vibrations with frequencies up to and exceeding 2 kHz. Behavioral studies show that escape ''jumps'' can be triggered in Labidocera madurae by the same types of disturbances. Sensitivities as low as 4 nm were observed at frequencies of ca. 900 Hz. Behavioral sensitivities are similar to those measured physiologically and suggest that firing of the GAMs is capable of triggering escape behavior, perhaps even with a single nerve impulse.