Tolerance of chronic hypercapnia by the European eel Anguilla anguilla
European eels were exposed for 6 weeks to water CO 2 partial pressures ( P CO 2 ) from ambient (approx. 0.8 mmHg), through 15±1 mmHg and 30±1 mmHg to 45±1 mmHg in water with a total hardness of 240 mg l–1 as CaCO 3 , pH 8.2, at 23±1°C. Arterial plasma P CO 2 equilibrated at approximately 2 mmHg abov...
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fthighwire:oai:open-archive.highwire.org:jexbio:206/10/1717 2023-05-15T13:28:08+02:00 Tolerance of chronic hypercapnia by the European eel Anguilla anguilla McKenzie, D. J. Piccolella, M. Valle, A. Z. Dalla Taylor, E. W. Bolis, C. L. Steffensen, J. F. 2003-05-15 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/206/10/1717 https://doi.org/10.1242/jeb.00352 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/206/10/1717 http://dx.doi.org/10.1242/jeb.00352 Copyright (C) 2003, Company of Biologists Research Article TEXT 2003 fthighwire https://doi.org/10.1242/jeb.00352 2015-02-28T16:30:28Z European eels were exposed for 6 weeks to water CO 2 partial pressures ( P CO 2 ) from ambient (approx. 0.8 mmHg), through 15±1 mmHg and 30±1 mmHg to 45±1 mmHg in water with a total hardness of 240 mg l–1 as CaCO 3 , pH 8.2, at 23±1°C. Arterial plasma P CO 2 equilibrated at approximately 2 mmHg above water P CO 2 in all groups, and plasma bicarbonate accumulated up to 72 mmol l–1 in the group at a water P CO 2 of 45 mmHg. This was associated with an equimolar loss of plasma Cl–, which declined to 71 mmol l–1 at the highest water P CO 2 . Despite this, extracellular acid–base compensation was incomplete; all hypercapnic groups tolerated chronic extracellular acidoses and reductions in arterial blood O 2 content ( C a O 2 ), of progressive severity with increasing P CO 2 . All hypercapnic eels, however, regulated the intracellular pH of heart and white muscle to the same levels as normocapnic animals. Hypercapnia had no effect on such indicators of stress as plasma catecholamine or cortisol levels, plasma osmolality or standard metabolic rate. Furthermore, although C a O 2 was reduced by approximately 50% at the highest P CO 2 , there was no effect of hypercapnia on the eels' tolerance of hypoxia, aerobic metabolic scope or sustained swimming performance. The results indicate that, at the levels tested, chronic hypercapnia was not a physiological stress for the eel, which can tolerate extracellular acidosis and extremely low Cl– levels while compensating tissue intracellular pH, and which can meet the O 2 requirements of routine and active metabolism despite profound hypoxaemia. Text Anguilla anguilla HighWire Press (Stanford University) Journal of Experimental Biology 206 10 1717 1726 |
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Research Article McKenzie, D. J. Piccolella, M. Valle, A. Z. Dalla Taylor, E. W. Bolis, C. L. Steffensen, J. F. Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
topic_facet |
Research Article |
description |
European eels were exposed for 6 weeks to water CO 2 partial pressures ( P CO 2 ) from ambient (approx. 0.8 mmHg), through 15±1 mmHg and 30±1 mmHg to 45±1 mmHg in water with a total hardness of 240 mg l–1 as CaCO 3 , pH 8.2, at 23±1°C. Arterial plasma P CO 2 equilibrated at approximately 2 mmHg above water P CO 2 in all groups, and plasma bicarbonate accumulated up to 72 mmol l–1 in the group at a water P CO 2 of 45 mmHg. This was associated with an equimolar loss of plasma Cl–, which declined to 71 mmol l–1 at the highest water P CO 2 . Despite this, extracellular acid–base compensation was incomplete; all hypercapnic groups tolerated chronic extracellular acidoses and reductions in arterial blood O 2 content ( C a O 2 ), of progressive severity with increasing P CO 2 . All hypercapnic eels, however, regulated the intracellular pH of heart and white muscle to the same levels as normocapnic animals. Hypercapnia had no effect on such indicators of stress as plasma catecholamine or cortisol levels, plasma osmolality or standard metabolic rate. Furthermore, although C a O 2 was reduced by approximately 50% at the highest P CO 2 , there was no effect of hypercapnia on the eels' tolerance of hypoxia, aerobic metabolic scope or sustained swimming performance. The results indicate that, at the levels tested, chronic hypercapnia was not a physiological stress for the eel, which can tolerate extracellular acidosis and extremely low Cl– levels while compensating tissue intracellular pH, and which can meet the O 2 requirements of routine and active metabolism despite profound hypoxaemia. |
format |
Text |
author |
McKenzie, D. J. Piccolella, M. Valle, A. Z. Dalla Taylor, E. W. Bolis, C. L. Steffensen, J. F. |
author_facet |
McKenzie, D. J. Piccolella, M. Valle, A. Z. Dalla Taylor, E. W. Bolis, C. L. Steffensen, J. F. |
author_sort |
McKenzie, D. J. |
title |
Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
title_short |
Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
title_full |
Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
title_fullStr |
Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
title_full_unstemmed |
Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
title_sort |
tolerance of chronic hypercapnia by the european eel anguilla anguilla |
publisher |
Company of Biologists |
publishDate |
2003 |
url |
http://jeb.biologists.org/cgi/content/short/206/10/1717 https://doi.org/10.1242/jeb.00352 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
http://jeb.biologists.org/cgi/content/short/206/10/1717 http://dx.doi.org/10.1242/jeb.00352 |
op_rights |
Copyright (C) 2003, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.00352 |
container_title |
Journal of Experimental Biology |
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206 |
container_issue |
10 |
container_start_page |
1717 |
op_container_end_page |
1726 |
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1766402383157395456 |