New insights in gill/buccal rhythm spiking activity and CO2sensitivityin pre- and postmetamorphic tadpoles (Pelophylax ridibundus)

Brigitte Quenet 1, * Christian Straus 2, 3 Marie-Noëlle Fiamma 2 Isabelle Rivals 1 Thomas Similowski 2, 4 Ginette Horcholle-Bossavit 1
* Corresponding author
1 ESA - Equipe de Statistique Appliquée
2 Neurophysiologie Respiratoire Expérimentale et Clinique
3 Service Central d'Explorations Fonctionnelles Respiratoires
4 Service de Pneumologie – Réanimation Médicale [CHU Pitié-Salpêtrière]
Abstract : tCentral CO2chemosensitivity is crucial for all air-breathing vertebrates and raises the question of itsrole in ventilatory rhythmogenesis. In this study, neurograms of ventilatory motor outputs recorded infacial nerve of premetamorphic and postmetamorphic tadpole isolated brainstems, under normo- andhypercapnia, are investigated using Continuous Wavelet Transform spectral analysis for buccal activityand computation of number and amplitude of spikes during buccal and lung activities. Buccal burstsexhibit fast oscillations (20-30 Hz) that are prominent in premetamorphic tadpoles: they result from thepresence in periodic time windows of high amplitude spikes. Hypercapnia systematically decreases thefrequency of buccal rhythm in both pre- and postmetamorphic tadpoles, by a lengthening of the interburstduration. In postmetamorphic tadpoles, hypercapnia reduces buccal burst amplitude and unmasks smallfast oscillations. Our results suggest a common effect of the hypercapnia on the buccal part of the CentralPattern Generator in all tadpoles and a possible effect at the level of the motoneuron recruitment inpostmetamorphic tadpoles.
Keywords : Amphibian buccal ventilation Central CO2chemosensitivity Fast oscillations CWT spectrum Spiking activity
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Brigitte Quenet, Christian Straus, Marie-Noëlle Fiamma, Isabelle Rivals, Thomas Similowski, et al.. New insights in gill/buccal rhythm spiking activity and CO2sensitivityin pre- and postmetamorphic tadpoles (Pelophylax ridibundus). Respiratory Physiology and Neurobiology, Elsevier, 2014, 191, pp.26-37. ⟨10.1016/j.resp.2013.10.013⟩. ⟨hal-00913617⟩

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