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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus (Crustacea: Decapoda)
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Chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus (Crustacea: Decapoda)

机译：多刺龙虾Panulirus argus和Panulirus interruptus（甲壳纲：十足目）口部中的化学感觉神经元

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摘要

We studied electrophysiological properties of single chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus to complement our growing understanding of the behavioral roles of mouthparts of decapod crustaceans. Food mixtures and 13 single compounds were used to characterize the response specificity, sensitivity, and time course of individual neurons in the endopods of maxilliped 2 and 3. Additional chemoreceptors were found in the mandibular palp and basis of maxilliped 1 but they were not characterized. Neurons were broadly tuned, with the five most potent single compounds being ammonium, adenosine-5′ -monophosphate, taurine, glutamate, and aspartate. Cluster analysis indicated that the neurons constitute a heterogeneous population that could be placed into seven groups linked according to their most excitatory compound. These neurons in the mouthparts had concentration-dependent responses, with thresholds between 10~(-7) and 10~(-4) M and without saturation even at 10~(-3) or 10~(-2) M. They also quickly adapted when exposed to their best compounds at 10~(-4) and 10~(-3) M. A comparison of the response properties of these neurons in the mouthparts with those of chemosensory neurons in other crustacean appendages shows that neurons in the mouthparts have relatively broad tuning biased toward detecting and resolving high concentrations. Based on these comparisons, we suggest a functional distinction among the chemosensors on the different appendages: long distance detection by the antennae, precise location and collection by the pereiopods, and detailed assessment of quality by the mouthparts.
机译：我们研究了刺龙虾Panulirus argus和Panulirus interruptus口器中单个化学感觉神经元的电生理特性，以补充我们对十足纲甲壳动物口器的行为作用的日益了解。食物混合物和13种单一化合物用于表征maxilliped 2和3的内足中单个神经元的反应特异性，敏感性和时程。在下颌掌和maxilliped 1的基础中发现了其他化学感受器，但未进行表征。对神经元进行了广泛的调谐，其中五个最有效的单一化合物是铵，5'-一磷酸腺苷，牛磺酸，谷氨酸和天冬氨酸。聚类分析表明，神经元构成了一个异质种群，根据它们最具有刺激性的化合物，可以将它们分成七个组。这些口中神经元具有浓度依赖性反应，阈值在10〜（-7）和10〜（-4）M之间，即使在10〜（-3）或10〜（-2）M时也没有饱和。当暴露于10〜（-4）和10〜（-3）M的最佳化合物时，它们很快适应。口腔中这些神经元的反应特性与其他甲壳类附属物中化学感觉神经元的响应特性比较表明，神经元口器具有相对较宽的调音，偏向于检测和解决高浓度。基于这些比较，我们建议化学传感器在不同附件上的功能区别：通过触角进行长距离检测，通过脚足类进行精确定位和收集，以及通过口器进行详细的质量评估。

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