Tolerance of chronic hypercapnia by the European eel Anguilla anguilla
European eels were exposed for 6 weeks to water CO2 partial pressures (PCO·) from ambient (approx.0.8·mmHg), through 15±1·mmHg and 30±1·mmHg to 45±1·mmHg in water with a total hardness of240·mg·l–1 as CaCO3, pH 8.2, at 23±1°C. Arterial plasma PCO· equilibrated at approximately 2·mmHg above water PCO...
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2003
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Online Access: | http://hdl.handle.net/2434/173083 https://doi.org/10.1242/jeb.00352 |
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ftunivmilanoair:oai:air.unimi.it:2434/173083 2024-02-04T09:52:56+01:00 Tolerance of chronic hypercapnia by the European eel Anguilla anguilla D. J. McKenzie E. W. Taylor C. L. Bolis J. F. Steffensen M. Piccolella A.Z. Dalla Valle D.J. McKenzie M. Piccolella A.Z. Dalla Valle E.W. Taylor C.L. Boli J.F. Steffensen 2003-03-05 http://hdl.handle.net/2434/173083 https://doi.org/10.1242/jeb.00352 eng eng The Company of Biologists info:eu-repo/semantics/altIdentifier/pmid/12682103 info:eu-repo/semantics/altIdentifier/wos/WOS:000183068900016 volume:206 issue:10 firstpage:1717 lastpage:1726 journal:JOURNAL OF EXPERIMENTAL BIOLOGY http://hdl.handle.net/2434/173083 doi:10.1242/jeb.00352 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0037506078 info:eu-repo/semantics/openAccess Acid-base balance Aerobic scope Anguilla anguilla European eel Hypercapnia Hypoxia Metabolic rate Stre Swimming performance Settore BIO/13 - Biologia Applicata info:eu-repo/semantics/article 2003 ftunivmilanoair https://doi.org/10.1242/jeb.00352 2024-01-09T23:25:18Z European eels were exposed for 6 weeks to water CO2 partial pressures (PCO·) from ambient (approx.0.8·mmHg), through 15±1·mmHg and 30±1·mmHg to 45±1·mmHg in water with a total hardness of240·mg·l–1 as CaCO3, pH 8.2, at 23±1°C. Arterial plasma PCO· equilibrated at approximately 2·mmHg above water PCO· in all groups, and plasma bicarbonate accumulated up to 72·mmol·l–1 in the group at a water PCO· of 45·mmHg. This was associated with an equimolar loss of plasma Cl–, which declined to 71·mmol·l–1 at the highest water PCO·. Despite this, extracellular acid–base compensation was incomplete; all hypercapnic groups tolerated chronic extracellular acidoses and reductions in arterial blood O2 content (CaO·), of progressive severity with increasing PCO·. 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 CaO· was reduced by approximately 50% at the highest PCO·, 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 O2 requirements of routine and active metabolism despite profound hypoxaemia. Article in Journal/Newspaper Anguilla anguilla The University of Milan: Archivio Istituzionale della Ricerca (AIR) Journal of Experimental Biology 206 10 1717 1726 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Acid-base balance Aerobic scope Anguilla anguilla European eel Hypercapnia Hypoxia Metabolic rate Stre Swimming performance Settore BIO/13 - Biologia Applicata |
spellingShingle |
Acid-base balance Aerobic scope Anguilla anguilla European eel Hypercapnia Hypoxia Metabolic rate Stre Swimming performance Settore BIO/13 - Biologia Applicata D. J. McKenzie E. W. Taylor C. L. Bolis J. F. Steffensen M. Piccolella A.Z. Dalla Valle Tolerance of chronic hypercapnia by the European eel Anguilla anguilla |
topic_facet |
Acid-base balance Aerobic scope Anguilla anguilla European eel Hypercapnia Hypoxia Metabolic rate Stre Swimming performance Settore BIO/13 - Biologia Applicata |
description |
European eels were exposed for 6 weeks to water CO2 partial pressures (PCO·) from ambient (approx.0.8·mmHg), through 15±1·mmHg and 30±1·mmHg to 45±1·mmHg in water with a total hardness of240·mg·l–1 as CaCO3, pH 8.2, at 23±1°C. Arterial plasma PCO· equilibrated at approximately 2·mmHg above water PCO· in all groups, and plasma bicarbonate accumulated up to 72·mmol·l–1 in the group at a water PCO· of 45·mmHg. This was associated with an equimolar loss of plasma Cl–, which declined to 71·mmol·l–1 at the highest water PCO·. Despite this, extracellular acid–base compensation was incomplete; all hypercapnic groups tolerated chronic extracellular acidoses and reductions in arterial blood O2 content (CaO·), of progressive severity with increasing PCO·. 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 CaO· was reduced by approximately 50% at the highest PCO·, 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 O2 requirements of routine and active metabolism despite profound hypoxaemia. |
author2 |
D.J. McKenzie M. Piccolella A.Z. Dalla Valle E.W. Taylor C.L. Boli J.F. Steffensen |
format |
Article in Journal/Newspaper |
author |
D. J. McKenzie E. W. Taylor C. L. Bolis J. F. Steffensen M. Piccolella A.Z. Dalla Valle |
author_facet |
D. J. McKenzie E. W. Taylor C. L. Bolis J. F. Steffensen M. Piccolella A.Z. Dalla Valle |
author_sort |
D. J. McKenzie |
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 |
The Company of Biologists |
publishDate |
2003 |
url |
http://hdl.handle.net/2434/173083 https://doi.org/10.1242/jeb.00352 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/12682103 info:eu-repo/semantics/altIdentifier/wos/WOS:000183068900016 volume:206 issue:10 firstpage:1717 lastpage:1726 journal:JOURNAL OF EXPERIMENTAL BIOLOGY http://hdl.handle.net/2434/173083 doi:10.1242/jeb.00352 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0037506078 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1242/jeb.00352 |
container_title |
Journal of Experimental Biology |
container_volume |
206 |
container_issue |
10 |
container_start_page |
1717 |
op_container_end_page |
1726 |
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