| Compensation for hypercapnia by a euryhaline elasmobranch: effect of salinity and roles of gills and kidneys in fresh water. | |
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MedLine Citation:
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PMID: 12911113 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Specimens of the euryhaline elasmobranch, Dasyatis sabina were acclimated to seawater and fresh water, and exposed to normocapnic (air) and hypercapnic (1% CO2 in air) environmental water. Blood pH, PCO2, and [HCO3-], as well as whole-animal net-acid excretion, were measured for up to 24 h of hypercapnia. In a separate experimental series, urine was collected from freshwater acclimated stingrays during 8 h of normocapnia and hypercapnia. Stingrays in both salinities at least partially compensated for the respiratory acidosis by accumulating HCO3- in their extracellular spaces. The degree of compensation for blood pH was 88.5% in seawater, but only 31.0% in fresh water after 24 h of hypercapnia. Whole-animal net-acid excretion was also greater in seawater than in fresh water, as was the increase in extracellular fluid [HCO3-]. Mean urinary net-acid excretion rates were slightly negative, and never increased above normocapnic control rates during hypercapnia. Since whole-animal net-acid excretion rates increased with blood [HCO3-], and urinary excretion was always negative, the gills were probably the primary organ responsible for compensation from environmental hypercapnia. The faster, and more complete, compensation for hypercapnia in seawater than in fresh water for this euryhaline elasmobranch is consistent with data for euryhaline teleosts, and probably reflects Na+-dependent mechanisms of branchial acid excretion. |
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Authors:
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Keith Patrick Choe; David H Evans |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of experimental zoology. Part A, Comparative experimental biology Volume: 297 ISSN: 1548-8969 ISO Abbreviation: J. Exp. Zoolog. Part A Comp. Exp. Biol. Publication Date: 2003 May |
Date Detail:
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Created Date: 2003-08-12 Completed Date: 2003-12-23 Revised Date: 2009-10-05 |
Medline Journal Info:
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Nlm Unique ID: 101168223 Medline TA: J Exp Zool A Comp Exp Biol Country: United States |
Other Details:
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Languages: eng Pagination: 52-63 Citation Subset: IM |
Affiliation:
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Department of Zoology, University of Florida, Gainesville, Florida 32611, USA. kchoe@zoo.ufl.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Bicarbonates / blood, urine Carbon Dioxide / pharmacology Female Fresh Water / chemistry* Gills / drug effects*, physiology Hydrogen-Ion Concentration Hypercapnia / blood, physiopathology*, urine Kidney / drug effects*, physiology Male Seawater Skates (Fish) / blood, physiology*, urine Sodium Chloride / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Bicarbonates; 124-38-9/Carbon Dioxide; 7647-14-5/Sodium Chloride |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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