Publication
Title
Does ammonia trigger hyperventilation in the elasmobranch, **Squalus acanthias suckleyi**?
Author
Abstract
We examined the ventilatory response of the spiny dogfish, to elevated internal or environmental ammonia. Sharks were injected via arterial catheters with ammonia solutions or their Na salt equivalents sufficient to increase plasma total ammonia concentration [TAmm]a by 35 fold from 145 ± 21 μM to 447 ± 150 μM using NH4HCO3 and a maximum of 766 ± 100 μM using (NH4)2SO4. (NH4)2SO4 caused a small increase in ventilation frequency (+14%) and a large increase in amplitude (+69%), while Na2SO4 did not. However, CO2 partial pressure (PaCO2) also increased and arterial pHa and plasma bicarbonate concentration ([HCO3−]a) decreased. NH4HCO3 caused a smaller increase in plasma ammonia resulting in a smaller but significant, short lived increases in ventilation frequency (+6%) and amplitude (36%), together with a rise in PaCO2 and [HCO3−]a. Injection with NaHCO3 which increased pHa and [HCO3−]a did not change ventilation. Plasma ammonia concentration correlated significantly with ventilation amplitude, while ventilation frequency showed a (negative) correlation with pHa. Exposure to high environmental ammonia (1500 μM NH4HCO3) did not induce changes in ventilation until plasma [TAmm]a increased and ventilation amplitude (but not frequency) increased in parallel. We conclude that internal ammonia stimulates ventilation in spiny dogfish, especially amplitude or stroke volume, while environmental ammonia only stimulates ventilation after ammonia diffuses into the bloodstream.
Language
English
Source (journal)
Respiratory physiology and neurobiology. - Amsterdam, 2002, currens
Publication
Amsterdam : 2015
ISSN
1569-9048
Volume/pages
206(2015), p. 25-35
ISI
000348893300006
Full text (Publisher's DOI)
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UAntwerpen
Faculty/Department
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Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
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Creation 08.01.2015
Last edited 04.07.2017
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