Document Detail


Behavioral and physiological compensation for chronic hypoxia in the sailfin molly (Poecilia latipinna).
MedLine Citation:
PMID:  15449231     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study demonstrates that short-term behavioral and physiological responses may permit the sailfin molly Poecilia latipinna to cope successfully with extreme hypoxia and suggests an interaction between behavioral response (aquatic surface respiration [ASR]) and physiological compensation. Poecilia latipinna acclimated to chronic hypoxia (6 wk at 1.0 mg L(-1) O(2)) exhibited higher hemoglobin and red blood cell concentrations and a 17%-19% lower critical oxygen tension than fish acclimated to normoxia. Ventilation frequency increased twofold under acclimation to hypoxia, a response that did not diminish with time. However, the use of ASR was an immediate response to hypoxia that decreased over the acclimation period. This suggests that gradual physiological compensation decreases the threshold for ASR. There was no consistent effect of hypoxia on mortality and no effect of hypoxia treatment on the number of gestating females, suggesting that plastic behavioral and physiological responses in P. latipinna compensate for hypoxia to a degree that mitigates a decrease in survivorship and facilitates continued reproduction in a laboratory setting. However, there may be predation costs in the field related to ASR.
Authors:
Cindy M Timmerman; Lauren J Chapman
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  77     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2004 Jul-Aug
Date Detail:
Created Date:  2004-09-27     Completed Date:  2004-12-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  601-10     Citation Subset:  IM    
Affiliation:
Department of Zoology, University of Florida, Gainesville, FL 32611, USA.
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MeSH Terms
Descriptor/Qualifier:
Acclimatization / physiology*
Animals
Anoxia / blood,  physiopathology,  veterinary*
Basal Metabolism
Erythrocyte Count / veterinary
Fish Diseases / blood*,  physiopathology*
Florida
Hemoglobins / metabolism
Motor Activity / physiology
Oxygen / blood
Poecilia
Reproduction / physiology
Respiration
Chemical
Reg. No./Substance:
0/Hemoglobins; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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