Neuroanatomical and neurophysiological mechanisms of acoustic and weakly electric signaling in synodontid catfish
| Autor: | Loïc Kéver, Eric Parmentier, Andrew H. Bass, Boris P. Chagnaud |
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| Rok vydání: | 2020 |
| Předmět: |
Male
0301 basic medicine Nervous system Population premotor neurons Synodontis nigriventris Biology animal vocalization 03 medical and health sciences patch‐clamp technique 0302 clinical medicine Species Specificity Convergent evolution medicine Animals Muscle Skeletal education Electric fish Research Articles Catfishes Motor Neurons AB_2337249 Electric Organ education.field_of_study AB_2337244 Electromyography Mechanism (biology) General Neuroscience Neurophysiology biology.organism_classification 030104 developmental biology medicine.anatomical_structure Female Nerve Net Vocalization Animal Neuroscience 030217 neurology & neurosurgery Research Article Electric Fish Catfish |
| Zdroj: | The Journal of Comparative Neurology |
| ISSN: | 1096-9861 0021-9967 |
| Popis: | To what extent do modifications in the nervous system and peripheral effectors contribute to novel behaviors? Using a combination of morphometric analysis, neuroanatomical tract‐tracing, and intracellular neuronal recording, we address this question in a sound‐producing and a weakly electric species of synodontid catfish, Synodontis grandiops, and Synodontis nigriventris, respectively. The same peripheral mechanism, a bilateral pair of protractor muscles associated with vertebral processes (elastic spring mechanism), is involved in both signaling systems. Although there were dramatic species differences in several morphometric measures, electromyograms provided strong evidence that simultaneous activation of paired protractor muscles accounts for an individual sound and electric discharge pulse. While the general architecture of the neural network and the intrinsic properties of the motoneuron population driving each target was largely similar, differences could contribute to species‐specific patterns in electromyograms and the associated pulse repetition rate of sounds and electric discharges. Together, the results suggest that adaptive changes in both peripheral and central characters underlie the transition from an ancestral sound to a derived electric discharge producing system, and thus the evolution of a novel communication channel among synodontid catfish. Similarities with characters in other sonic and weakly electric teleost fish provide a striking example of convergent evolution in functional adaptations underlying the evolution of the two signaling systems among distantly related taxa. Synodontid catfishes use an Elastic Spring Apparatus, including protractor muscles, to produce electric discharges or sounds. Anatomical characterization, together with motoneuron patch‐clamp recordings and protractor muscle EMGs suggest that adaptive changes in peripheral and central characters underlie the transition from an ancestral sound to a derived electric discharge producing system. |
| Databáze: | OpenAIRE |
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