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Mechanosensory properties of the mouthpart setae of the European shore crab Carcinus maenas

机译：欧洲岸蟹Carcinus maenas口部刚毛的机械感官特性

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摘要

In decapod crustaceans, the largest density and diversity of sensilla, referred to as setae, is in general found on the mouthparts, but little is known about their sensory properties and thereby their functions. Here data are presented from mechanoreceptors from the two largest mouthparts, maxilliped 2 and 3, of the European shore crab Carcinus maenas. The mechanoreceptors were found to respond to either displacements of the entire seta or bending of the setal shaft. The displacement-sensitive cells encode both the amplitude and the velocity of the displacement and about half were found to be directional but most in a non-exclusive way. The amplitude of the stimulus is encoded in the number of spikes produced with a linear correlation. The velocity is encoded in the interspike intervals with shorter intervals at higher velocities. In the latter case, the correlation follows a power function. The physiological data is correlated with the morphology and usage of the maxillipeds were examined with scanning electron microscopy and macro video recordings respectively. Recordings were obtained from cells associated with four different setal types and they all showed similar mechanosensory properties supporting that the external morphology of setae is more closely connected to their non-sensory functions, e.g., mechanical manipulation of the food items. The details of the sensory properties together with the high setal density, especially on maxilliped 3, suggest that a large amount of tactile information is gathered during feeding.
机译：在十足动物甲壳类动物中，通常在口器上发现最大密度和多样性的感性菌（称为刚毛），但对其感官特性以及其功能知之甚少。这里的数据来自欧洲岸蟹Carcinus maenas的两个最大口器（最大2和3）的机械感受器。发现机械感受器对整个刚毛的位移或刚毛轴的弯曲有反应。位移敏感单元对位移的幅度和速度都进行编码，发现大约一半是定向的，但大多数是非排他性的。刺激的幅度被编码为具有线性相关性的尖峰数量。在尖峰间的间隔中以较高的速度以较短的间隔编码速度。在后一种情况下，相关遵循幂函数。生理数据与形态有关，并分别用扫描电子显微镜和宏观视频记录检查了最大足动物的用法。从与四种不同背景类型相关的细胞获得的记录，它们都显示出相似的机械感官特性，这证明硬毛的外部形态与它们的非感官功能（例如食品的机械操作）更紧密地联系在一起。感官特性的详细信息以及较高的固定密度，尤其是在最大值3上，表明在进食过程中收集了大量触觉信息。

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  • 来源
    《Marine biology》 |2005年第5期|p.1179-1190|共12页
  • 作者

    A. Garm;

  • 作者单位

    Department of Cell Biology and Comparative Zoology, University of Copenhagen, Copenhagen, Denmark;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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