| Effect of hematocrit on behavioral thermoregulation of the toad Bufo marinus. | |
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MedLine Citation:
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PMID: 2109945 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study tested the hypothesis that the oxygen capacity of blood, indexed by hematocrit, affects the body temperature (Tb) selected by toads (Bufo marinus) in a thermal gradient. Anesthetized toads (Brevital sodium; 40 mg/kg im) were fitted with a cloacal thermistor and femoral artery cannula. After recovery, they were placed in a thermal gradient ranging from approximately 10 to 40 degrees C. Tb was measured for 24 h. Then 1-2 ml blood were withdrawn and replaced with an equal volume of either 0.66% saline or packed red cells from donor toads. Selected Tb was measured for the next 24 h. The mean Tb selected by B. marinus (n = 33) was 24.9 degrees C. Cross-sectional analysis showed no correlation between selected Tb and hematocrit. However, each toad rendered anemic showed a reduction of selected Tb (mean = 22.9 degrees C). The degree of Tb reduction was correlated with the hematocrit reduction, (r = 0.86; P = 0.013). Blood doping did not have a significant effect on selected Tb. The reduction of Tb could be adaptive by reducing oxygen consumption. |
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Authors:
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S C Wood |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The American journal of physiology Volume: 258 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1990 Apr |
Date Detail:
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Created Date: 1990-05-25 Completed Date: 1990-05-25 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: R848-51 Citation Subset: IM |
Affiliation:
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Oxygen Transport Program, Lovelace Medical Foundation, Albuquerque, New Mexico 87108. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Behavior, Animal / physiology* Body Temperature Body Temperature Regulation* Bufo marinus / physiology* Hematocrit* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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